Lei Zhang1,2,3
Jinting Liu1,2,3Ziyan Dai1,2,3Jia Wang1,2,3Mengyang Wu1,2,3Ruicong Su1,2,3
Di Zhang1,2,3*- 1College of Veterinary Medicine, Jilin Agricultural University, Changchun, China
- 2College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
- 3Jilin Provincial Engineering Research Center of Animal Probiotics, Jilin Agricultural University, Changchun, China
The discovery of regulated necrosis revitalizes the understanding of necrosis from a passive and accidental cell death to a highly coordinated and genetically regulated cell death routine. Since the emergence of RIPK1 (receptor-interacting protein kinase 1)-RIPK3-MLKL (mixed lineage kinase domain-like) axis-mediated necroptosis, various other forms of regulated necrosis, including ferroptosis and pyroptosis, have been described, which enrich the understanding of pathophysiological nature of diseases and provide novel therapeutics. Micronutrients, vitamins, and minerals, position centrally in metabolism, which are required to maintain cellular homeostasis and functions. A steady supply of micronutrients benefits health, whereas either deficiency or excessive amounts of micronutrients are considered harmful and clinically associated with certain diseases, such as cardiovascular disease and neurodegenerative disease. Recent advance reveals that micronutrients are actively involved in the signaling pathways of regulated necrosis. For example, iron-mediated oxidative stress leads to lipid peroxidation, which triggers ferroptotic cell death in cancer cells. In this review, we illustrate the crosstalk between micronutrients and regulated necrosis, and unravel the important roles of micronutrients in the process of regulated necrosis. Meanwhile, we analyze the perspective mechanism of each micronutrient in regulated necrosis, with a particular focus on reactive oxygen species (ROS).
Introduction
Regulation of tissue homeostasis by programmed cell death (PCD) is a fundamental process with broadly physiological and pathological implications. As one of the most investigated PCDs, apoptosis is characterized as a strictly regulated and caspase-dependent cell death routine, which is essential for the maintenance and repair of tissues (1). Dysfunction of apoptosis contributes to a broad range of developmental abnormalities and diseases (2, 3). Unlike necrosis, apoptosis keeps its membrane integrity, which retains its intracellular content and does not trigger inflammation. On the other hand, necrosis has been described as an unregulated and accidental cell death, triggered by extracellular signals, such as cytokines, microbial infections, or ischemia/reperfusion (I/R) (4). The rapid rupture of plasma membrane prompts the release of inflammatory cellular contents into the microenvironment, which activates immune system and initiates inflammatory response (5–7). Unrestrained activation of necrosis contributes to various diseases and injuries in multiple tissues, like in kidney (8) and liver (9).
Recent advances in cell biology revolutionize the nomenclature of necrosis by identifying that at least some forms of necrosis are reversibly PCD processes, referred as regulated necrosis. Three forms of regulated necrosis, necroptosis, ferroptosis, and pyroptosis, are discovered and studied in detail. Among them, tumor necrosis factor α (TNFα)-triggered necroptosis is the first established one, which can be inhibited by a small molecule, necrostatin-1 (Nec-1) via targeting receptor-interacting protein kinase 1 (RIPK1) (10). Ferroptosis is another unique form of regulated necrosis that is executed by iron-derived lipid peroxidation. Labile iron or iron-containing lipoxygenases (LOXs)-produced lipid peroxides facilitate the formation of structured lipid pores on the plasma membrane, leading to cell death (11, 12). Pyroptosis, triggered by activation of inflammasome, is a more recently identified form of regulated necrosis, stimulated by microbial infections and non-infectious factors (13, 14).
Reactive oxygen species (ROS) are O2-derived free radical (such as superoxide anion and hydroxyl radical) and non-radical species (such as hydrogen peroxide) (15). As byproducts, ROS are produced by partial reduction of oxygen, proceeding from either endogenous mitochondrial oxidative phosphorylation, or exogenous sources, such as heavy metals and radiation (16). Normally, excess ROS are rapidly removed by cellular antioxidant defense system. However, once the redox balance is impaired, the overwhelming ROS-caused oxidative stress can induce damage to cellular macromolecules directly or indirectly, which leads to a variety of pathophysiological conditions, including regulated necrosis. For instance, mitochondria-derived ROS promoted autophosphorylation of RIPK1, which enabled RIPK1 to recruit RIPK3 to form necrosome (RIPK1/RIPK3), initiating TNFα-mediated necroptosis in colon cancer cells (17). Iron-dependent lipid peroxidation is a major driver to ferroptosis (18). Wang et al. also found that ROS promoted NOD-like receptor pyrin domain-containing protein 3 (NLRP3) inflammasome activation and caspase-1-dependent gasdermin D (GSDMD) cleavage, leading to pyroptotic cell death in macrophages (19).
Micronutrients are elements that consist of minerals and vitamins. Although they appear in trace amount, micronutrients are indispensable to life functions, such as metabolism, cell growth, development, and differentiation (20, 21). Recent studies have disclosed the critical role of micronutrients in regulation of regulated necrosis process (22, 23). Interestingly, ROS are found important in the crosstalk between micronutrients and regulated necrosis. In this review, we illustrate the critical roles of major micronutrients in the biological process of regulated necrosis, with a focus on ROS as a link that bridges the interplay between micronutrients and regulated necrosis.
Molecular mechanisms of regulated necrosis
Necroptosis
Necroptosis is characterized with morphological features, including organelle swelling, plasma membrane rupture, and leakage of intracellular components (24). In consistent with uncontrolled necrosis, necroptosis also triggers inflammatory response (25). However, unlike necrosis, necroptosis can be blocked by a specific inhibitor of RIPK1, Nec-1 (10). The activation of necroptosis pathway has been implicated in many human pathologies, such as I/R injuries, inflammatory bowel disease (IBD) and neurodegenerative disease (24). Necroptosis can be stimulated by a plethora of stimuli, including members of the TNF receptor (TNFR) superfamily (10, 26), pattern recognition receptors (PRRs) (27), T cell receptors (TCRs) (28), multiple chemotherapeutic drugs (29, 30), and environmental stress such as hypoxia (31). Here, we illustrate necroptotic signaling pathway through most investigated TNFα-TNFR1 axis (Figure 1A).
Figure 1. Molecular mechanisms of regulated necrosis. (A) Necroptosis. Activation of TNFR1 by TNFα induces the formation of complex I, which contains RIPK1, TRADD, TRAF2/5, and cIAP1/2. Then, RIPK1 is ubiquitinated by cIAP1/2 to form K63-ubiquitin chains, which is removed by A20. The formed K63 uboquitination recruits LUBAC to complex I, where LUBAC catalyzes the formation of M1-ubiquitin chain on RIPK1, which is removed by CYLD. K63 ubiquitination of RIPK1 promotes the formation of necrosome, which subsequently phosphorylates MLKL to initiate necroptosis. Whereas, M1 ubiquitination induces the assembly of complex IIa, which initiates apoptosis. When caspase 8 is inhibited, necroptosis is triggered via activation of necrosome. (B) Ferroptosis. Aberrant buildup of ROS induces lipid peroxidation, which leads to ferroptosis. Intracellular ferrous ion (Fe2+) catalyzes lipid peroxidation via Fenton reaction and LOXs. GPX4, in turn, hydrolyses lipid peroxides, converting them to corresponding lipid alcohols. The antioxidant activity of GPX4 requires the participation of GSH, whose synthesis depends on cystine/glutamate antiporter system Xc–. inhibition of GPX4 or system Xc– initiates ferroptosis. (C) Pyroptosis. PAMPs and DAMPs activate inflammasome assembly. Inflammaspme sensor (NLRP3) interacts with ASC, which recruits pro-caspase 1. Pro-caspase 1 is activated by autocleavage. Activated casapse 1 not only cleaves GSDMD to induce pyroptosis, but also processes the precursors of IL-1β/IL-18 to mature IL-1β/IL-18, which are released through the pores formed by N-GSDMD.
TNFR1 ligation by TNFα recruits key regulator of necroptosis, RIPK1, together with other associated proteins, including TNFR-associated death domain (TRADD), cellular inhibitor of apoptosis protein 1/2 (cIAP1/2), and TNFR-associated factor 2/5 (TRAF2/5), forming a membrane-bound multimeric protein complex, complex I (32–34). Within the complex, RIPK1 is polyubiquitinated by E3 ligases, cIAP1/2, forming a linear Lys-63 (K63) ubiquitin modification that inhibits RIPK1 and promotes NF-κB dependent cell survival (35, 36). Meanwhile, K63 ubiquitin chain also recruits linear ubiquitination (M1-Ubi) assembly complex (LUBAC) and CYLD (a complex of deubiquitinating enzyme), which are responsible to assemble and disassemble the Met 1 (M1)-ubiquitin linear chain on RIPK1, respectively (37–39). The different types of ubiquitin modification or M1/K63 ubiquitination ratio regulates the activation of RIPK1. A higher K63 ubiquitination coordinated by cIAP1/2 and CYLD activates RIPK1 and directs cell to TNFα-mediated necroptotic cell death, while a higher M1 ubiquitination coordinated by LUBAC and A20 (a deubiquitinase to remove K63-linear chain, recruited by M1-ubiquitin chain) protects cells against apoptosis and necroptosis after TNFα stimulation (40–42). Activated RIPK1 recruits FAS-associated death domain protein (FADD) and caspase-8 to form complex IIa. Within the complex, caspase-8 cleaves RIPK1, leading to pro-apoptotic caspase activation and apoptosis (39). Caspase-8 inhibition or deficiency rescues RIPK1, which promotes necroptosis by formation of complex IIb, consisting of RIPK1 and RIPK3 (43, 44). Autophosphorylated RIPK1 recruits and activates RIPK3 via phosphorylation (10, 45). The heterodimer of RIPK1 and RIPK3, or necrosome, subsequently phosphorylates the executioner, mixed-lineage kinase domain-like pseudokinase (MLKL) (46). Phosphorylated MLKL then oligomerizes and transmits to the plasma membrane, impairing membrane integrity by forming structured pores and leading to cell death (47).
Ferroptosis
Ferroptosis is an iron-dependent and lipid peroxidation-reliant regulated necrosis that was firstly described by Dr. Stockwell’s group in 2012 (11). It depicts a necrosis-like morphological changes and represents two biochemical characteristics, iron accumulation, and lipid peroxidation, two processes of which are interdependent (Figure 1B). Free iron (Fenton reaction) or iron-containing LOXs catalyzes lipid peroxidation, which is essential for the execution of ferroptosis by forming structured pores on the plasma membrane. Polyunsaturated fatty acids (PUFAs) are vulnerable to be attacked by iron-originated free radicals. The propagated lipid peroxides generate a myriad of secondary products, such as breakdown products of lipid peroxides and oxidized proteins, ultimately rupturing organelles and cell membrane (48).
Glutathione peroxidase 4 (GPX4), as a lipid hydroperoxidase, maintains the endogenous redox balance by reducing phospholipid hydroperoxides to their corresponding phospholipid alcohol (48). Glutathione (GSH) as a potent reductant, provides the required two electrons to promote GPX4-mediated lipid hydroperoxide reduction (48, 49). To synthesize GSH, cells uptake cysteine by cystine/glutamate antiporter system xc–, following two ATP-requiring enzymatic steps, formation of γ-glutamylcysteine by glutamate and cysteine, and formation of GSH by γ-glutamylcysteine and glycine (50, 51). RAS-selective lethal 3 (RSL3) directly binds the active site of GPX4 and inhibits its antioxidant activity, while erastin blocks cystine/glutamate antiporter system xc– that inhibits the antioxidant activity of GPX4 indirectly (11, 52). Both compounds accumulate iron-dependent lipid peroxides and initiate ferroptosis.
Pyroptosis
Pyroptosis defends against extracellular pathogen invasion by eliminating the infected cell and triggering inflammatory response. Although it represents some similarities as apoptosis, such as DNA damage and chromatin condensation, pyroptosis is distinct from other forms of cell death morphologically and mechanistically. Unlike apoptosis, pyroptosis is characterized by caspase-1-dependent, gasdermin-mediated rapid plasma membrane rupture and associated proinflammatory intracellular content release (Figure 1C). Inflammasome assembly initiates activation of canonical pyroptotic pathway. Inflammasome is a multiprotein complex that consists of three components, sensors, adaptor, and pro-caspase-1. Sensors are PRRs, which recognize microorganism or host-derived danger signals, designated as pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs), and trigger formation of inflammasome. PAMPs and DAMPs activate inflammasome sensors, including Nod-like receptor (NLR) family pyrin domain containing 3 (NLRP3), NLR family caspase activation and recruitment domain (CARD) containing 4 (NLRC4), NLR family pyrin domain-containing 1B (NLRP1B), absent in melanoma 2 (AIM2), and Pyrin (53, 54). Some receptors, like NLRP3, interacts with pro-caspase-1, with the coordination of ASC, an adopter protein that reserves a caspase activation and recruitment domain (CARD) (55). Other receptors, such as NLRC4, recruit pro-caspase-1 with their own CARD domain (55). Within the inflammasome, pro-caspase-1 is auto-cleaved and activated, which in turn hydrolyzes GSDMD, producing N-terminus and C-terminus of GSDMD. N-GSDMD oligomerizes, perforates plasma membrane and induces pyroptotic cell death (56–58). In addition, mature inflammatory cytokines, interleukin-1β (IL-1β) and interleukin (IL-18), cleaved by caspase-1, are released via N-DSDMD structured pores (58).
In addition to caspase-1-GSDMD axis, multiple stimuli also trigger pyroptosis through activating other caspases and their targeted GSDMs. Gram-negative bacteria-derived lipopolysaccharide (LPS) activated caspase-4/5/11, which subsequently cleaved GSDMD, leading to pyroptosis (59, 60). Yersinia infection induced pyroptosis through caspase-8-mediated GSDMD cleavage (61, 62). Chemotherapeutics were also observed that promoted caspase-3-dependent GSDME cleavage and induced pyroptosis by forming N-terminus of GSDME structured pores in tumor cells (63).
Micronutrients and regulated necrosis
Selenium and regulated necrosis
Selenium (Se) is an essential trace element, which is fundamentally involved in various biological functions. Daily diary provides Se from food, such as cereals, grains, and vegetables (64). A 50 μg/day intake of Se is estimated adequate to support normal cellular functions, whereas a significant higher intake of Se (350–700 μg/day) is toxic (64). Se deficiency also attributes to multiple pathophysiological conditions, such as heart disease, neuromuscular disorder, cancer, male infertility, and inflammation (65, 66). Identification of selenocysteine (Sec) and associated selenoproteins further reveals the importance of Se in physiological process.
Biosynthesis of selenoprotein
Se-containing protein, designated as selenoprotein, is biosynthesized through translationally incorporating Sec via a specific codon UGA, which is normally a termination codon during regular translational process (67). The cis-acting Sec insertion sequence (SECIS) element, a stem-loop-like structure in the 3′ untranslated region of selenoproteins, facilitates the incorporation of this rare amino acid in vertebrates (68). SECIS can be recognized and bond by SECIS binding protein 2 (SPB2) (69). Together with other co-factors assembled on SECIS of selenoprotein mRNA, they switch the UGA from a stop codon to Sec insertion signal (70, 71). The biosynthesis of Sec is executed on its own tRNA, tRNASec. During the process, seryl-tRNA synthetase catalyzes the conjugation of serine with tRNASec, which is further phosphorylated by phosphoseryl-tRNA kinase, yielding phospho-serine (P-Ser-tRNASec) (72). Meanwhile, selenophosphate synthetase 2 (SEPHS2) converts selenite to selenophosphate, which is incorporated in P-Ser-tRNASec via Sep(O-phosphoserine) tRNA:Sec [selenocysteine] tRNA synthase (SEPSECS), then hydrolyzed, forming Sec-tRNASec (23).
As a key feature, most selenoproteins contain Sec residues as the enzymatic site to catalyze redox reaction (73). Currently, 25 selenoproteins are found in human selenoproteome, and majority of them are involved in maintaining cellular redox homeostasis (65, 74). Glutathione peroxidases (GPXs) are important components among the selenoproteins. Eight GPX paralogs have been identified in mammals. Five of them (GPX1, GPX2, GPX3, GPX4, and GPX6) reserve a Sec residue as active site, which is replaced by Cys in the other three GPX homologs (GPX5, GPX7, and GPX8) (75). As the most abundant selenoproteins, GPX1 and GPX4 express ubiquitously, while GPX1 exists in cytoplasm, and GPX4 is found in cytoplasm, mitochondria, and nucleus (75, 76). GPX3 is secreted to plasma by kidney in a glycosylated form, whose activity can be used to evaluate the Se status in the organism (75, 77). GPX2 presents in the epithelial cells of gastrointestinal tract or epithelial tissue, such as lung and liver (75, 78). GPX6 is only found in the olfactory epithelia and embryonic tissues (75, 79). Another major part of selenoproteins is thioredoxin reductases (TXNRDs), which contain a Sec residue at the penultimate position of the C-terminal (80, 81). Three members of TXNRDs have been discovered. TXNRD1 and TXNRD2 are ubiquitously found in the cytoplasm and mitochondria, while TXNRD3 is restrictedly expressed in specific tissues, such as gastrointestinal tract (75, 82).
Selenium and necroptosis
Se deficiency has been revealed that promotes necroptosis and leads to damage in multiple tissues (83–86). MicroRNAs (miRNAs) are actively involved in the crosstalk between Se deficiency and necroptosis (Figure 2A). Through microRNAome analysis, Yang et al., identified that Se deficiency upregulated miR-200a-5p, which promoted RIPK3-dependent necroptosis via accumulating ROS and activating of mitogen-activated protein kinase (MAPK) pathway in chicken cardiac tissue (87). Se deficiency also suppressed miR-130 and miR-29a-3p in pig brain tissue. Decreased miR-130 and miR-29a-3p elevated CYLD and TNFR1 respectively, which facilitated the initiation of necroptosis (84, 88). Se deficiency deteriorated LPS-induced necroptosis by upregulating miR-16-5p, which subsequently activated PI3K/AKT pathway in chicken tracheal epithelial cells (85). Se supplement otherwise abolished LPS-induced oxidative stress and necroptosis via downregulating miR-155 and restoring its targeted gene, tumor necrosis factor receptor-associated factor 3 (TRAF3) (86). Besides regulation of miRNAs, Se was also found that antagonized cadmium-induced renal necroptosis by directly activating PI3K/AKT pathway via inhibiting PTEN (89).
Figure 2. Selenium (Se) antagnized regulated necrosis. (A) Necroptosis. Se deficiency promotes necroptosis by manipulating microRNAs, which target specific proteins involving in necroptosis signaling, MAPK signaling, and PI3K/AKT signaling. (B) Ferroptosis. To begin the synthesis of selenocysteine (Sec), seryl-tRNA synthetase (SerRS) attaches serine (Ser) to tRNASec. Then, Ser-tRNASec is phosphorylated by O-phosphoseryl-tRNASec kinase (PSTK) at seryl group to generate phosphoseryl—tRNASec (P-Ser-tRNASec). Finally, Sep(O-phosphoserine) tRNA:Sec [selenocysteine] tRNA synthase (SEPSECS) converts P-Ser-tRNASec into selenocysteinyl (Sec)-tRNASec with the participation of selenophosphate (SeP), which is the main Se donor in the process, produced by selenophosphate synthetase 2 (SEPHS2). Synthesized Sec is then incorporated into GPX4, which inhibits the lipid peroxidation and blocks ferroptosis. Selenoprotein P (SelP) transports Se across the membrane. The increased Se upregulates the expression of GPX4 through transcriptional coactivators, TRAP2C and Sp1.
The antioxidant function of Se also contributes to against necroptosis. Se supplement attenuated lead (Pb)-induced necroptosis through restoring redox balance and blocking MAPK/NF-κB pathway in chicken lymphocytes (90). Meanwhile, Se deficiency increased ROS level and augmented necroptosis in human uterine smooth muscle cells and swine liver (91, 92). However, Se nanoparticles reversely promoted ROS-mediated necroptosis with via upregulating TNF and interferon regulatory factor 1 (IRF1) in prostate cancer cells (93, 94).
Selenium and ferroptosis
Lipid peroxidation is essential for execution of ferroptosis. Iron-based oxidation of PUFA promotes the formation of lipid pores on the plasma membrane. GPX4, as a lipid hydroperoxidase, is designated to maintain the endogenous redox balance, which prevents the oxidation of PUFA and ferroptosis. GPX4 belongs to selenoprotein family, which converts lipid hydroperoxides to corresponding alcohols with the assistance of GSH (48, 49). As the active site, Sec incorporation is critical for GPX4 activity, which can be inhibited by RSL3 (52). GPX4 deficiency leads to accumulation of phospholipid hydroperoxides (PLOOH) and other lipid free radicals, which can be rapidly amplified by Fenton chain reaction and initiate ferroptosis (95).
As a selenoprotein, the expression and activity of GPX4 are regulated by Se (Figure 2B). Se supplement was shown to promote GPX4 expression in follicular helper T cells, which alleviated the accumulation of lipid peroxides and protected cells against ferroptotic cell death (96). Se protected neurons from I/R-induced ferroptosis via boosting GPX expression and activity (97). Alim et al. also observed that Se supplement increased the expression of selenoproteins, including GPX4, TXNRD1, GPX3, and selenoprotein P in neurons of intracerebral hemorrhage (ICH) mouse model (98). Se-mediated GPX4 upregulation was achieved via activation of transcriptional co-activators, TRAP2c and Sp1, which antagonized lipid oxidation, protected neurons, and improved brain functional recovery (98). Heat-stress-induced ferroptosis-like cell death was attenuated by Se-mediated upregulation of GPX4 and SOD activities in goat mammary epithelial cells (99). Bioinformatics analysis also suggested that lower Se level may be correlated with a disrupted iron metabolism and resultant ferroptosis in non-alcoholic fatty liver disease (NAFLD) liver (100). In cancer cells, Se is needed to promote cell survival by antagonizing ferroptosis. Vande Voorde et al. revealed that Se supplement alone was sufficient to promote survival and colony formation of breast cancer cells that proliferated at low density (101). Enhanced Sec-GPX4 axis restored the redox balance, which counteracted the ferroptosis (101). In addition, Se supplement also prevented spontaneous ferroptosis by increasing GPX4 expression in cultured adrenocortical carcinoma cells, which suggests that the ferroptotic sensitivity is relied on Se (102). Some chemicals can enhance Se sensitivity of GPX4. Fan et al. demonstrated that wedelolactone enhanced the transcription and Se sensitivity of GPX4, which attenuated oxidative stress-mediated ferroptosis and pyroptosis in chemical-induced acute pancreatitis (103). Curculigoside increased Se sensitivity and GPX4 transcription, which alleviated ferroptosis and associated oxidative stress in intestinal epithelial cells (104).
In addition to promote the expression of GPX4 and other selenoproteins, Se-based Sec insertion is required for the antioxidant function of GPX4 (105). Targeted mutation of Sec to Cys in GPX4 sensitized cells to peroxide-induced ferroptosis, accompanied with intracellular overoxidation (105). Another mutation, Gpx4-U46S, facilitated incorporation of Ser, instead of Sec, into the active site of GPX4, which impaired male spermatogenesis in heterozygous mice and were lethal at embryonic stage in homozygous mice (106). Liu et al. also observed a point mutation of GPX4, R152H damaged antioxidant activity and degradation of GPX4 (107).
The intracellular level of Se determines the Sec biosynthesis and expression of selenoproteins. The factors that regulate Se level also affect ferroptotic process. The cystine/glutamate antiporter, xCT, contributes to the uptake of Se. Upregulation of xCT subunits, solute carrier family 7 number 11 (SLCA11) or solute carrier family 3 member 2 (SLC3A2), increased the GPX4 expression, but paradoxically hypersensitized breast cancer cells to erastin or RSL3-induced ferroptosis (108). Similar observation was also reported by Carlisle et al. They showed that upregulation of SLC7A11 increased the uptake of Se, which contributed to selenophilic feature of cancer cells via promoting the biosynthesis of Sec and selenoproteins, against ferroptosis (109). Meanwhile, SEPHS2 was upregulated and detoxified the poisonous intermediate, selenide during Sec biosynthesis, which also promoted cancer cell survival (109). Selenoprotein P, a plasma membrane associated Se transporter, maintains the level of cellular selenoprotein. Deletion of selenoprotein P decreased GPX4 and selenoprotein K, and triggered ferroptosis-like cell death in pancreatic β cells, which was reversed by addition of Se (110). In addition, diaphanous-related formin-3 (DIAPH3) also upregulated cellular Se level and selenoprotein, TXNRD1, in pancreatic cancer cells (111). TXNRD1-mediated antioxidant effects enhanced malignancy of pancreatic cancer cells through antagonizing ferroptosis (111).
In contrast to prevent ferroptosis, selenite compound promotes ferroptosis. Sodium selenite triggered ferroptosis through downregulating SLC7A11, GSH and GPX4, but upregulating iron accumulation and lipid peroxidation in multiple cancer cells (112). Sodium selenite-induced ROS was scavenged by antioxidants such as SOD and Tiron, which antagonized resultant ferroptosis (112).
Iron and regulated necrosis
Iron is an essential micronutrient, which plays vital functions in multiple biochemical activities, including oxidative metabolism, energy metabolism, and many catalytic reactions (113). Dietary iron appears in heme and non-heme forms, which is absorbed through apical surface of duodenal enterocytes and exported into the circulation (114). Hepcidin is the main regulator of plasma iron concentration. The binding of hepcidin facilitates the degradation of its receptor-ferroportin1, an iron efflux pump. The degradation blocks cellular iron export and downregulated serum iron level (115). In humans, iron deficiency may lead to anemia, infections and heart failure, while iron overload-caused oxidative damage also induces multiple diseases (116).
Iron and ferroptosis
As we mentioned previously, aberrant accumulation of lipid peroxides, together with incapacity to eliminate them, leads to rapid membrane rupture and subsequent ferroptosis. Direct or indirect inactivation of GPX4 breaks the balance of lipid peroxide production and dissipation (117). Although it is still elusive, two primary mechanisms are found that contribute to lipid peroxidation in cells, which include iron-catalyzed autoxidation, and iron-dependent LOX-mediated lipid peroxidation (118–120). Both processes require the participation of iron (Figure 3). The iron-dependent non-enzymatic lipid peroxidation requires the generation of hydroxyl radical, which is catalyzed by Fenton reaction (Fe2+ + H2O2 → Fe3+ + HO⋅ + HO–) (118). The highly reactive hydroxyl radicals attack the labile bis-allylic hydrogen atom of lipids with PUFA tail, the products of which mediate the execution of ferroptosis (117, 118). On the other hand, LOX-derived lipid peroxidation also triggers ferroptosis. 15-LOX directly oxidized arachidonic acid and adrenoyl-phosphatidylethanolamines (PEs), which facilitated the execution of ferroptosis (121). 15-LOX and LOXE3 also mediated erastin-induced ferroptosis (52). GSH deficiency activated 12-LOX, which promoted lipid peroxidation and led to neuronal cell death (122). GPX4 inactivation led to 12/15 LOXs-dependent lipid peroxidation, which triggered apoptosis-inducing factor (AIF)-mediated cell death (123). Cytochrome P450 oxidoreductase (POR)-enabled membrane lipid peroxide overproduction promoted ferroptosis in cancer cells under the ferroptotic inducer treatment (124).
Figure 3. Iron metabolism and ferroptosis. Ferric state of iron (Fe3+) is bound to transferrin (Tf) in serum. Transferrin receptor 1 (TfR1) recognizes and binds the complex, which facilitates the endocytosis of ferric iron. The six-transmembrane epithelial antigen of the prostate-3 (Steap3) and acidic environment of the endosome jointly promote the reduction and release of ferrous iron (Fe2+). Divalent metal transporter 1 (DMT1) transports ferrous iron to cytoplasm, which is tightly controlled by ferritin. Autophagy (or ferritinophagy) selectively degrades ferritin with the coordination of nuclear receptor coactivator 4 (NCOA4), whose downregulation releases ferrous iron to activate lipid peroxidation, ultimately leading to ferroptosis. In addition, ferrous iron also triggers mitochondria-derived ROS through siderofexin (SFXN1). Ferroportin1 (FPN) can transport ferrous iron out of cell, which decreases the intracellular concentration of ferrous iron.
Due to its high redox activity, the iron transportation and delivery are under constant control with specific proteins. Extracellularly, transferrin binds ferric iron and promotes its endocytosis by interacting with transferrin receptor 1 on the cell surface (125). The acidic environment of endosome facilitates releases of iron from transferrin, which is then reduced by ferric reductases (Six-transmembrane epithelial antigen of protein 3, STEAP3) and transported to cytoplasm by divalent metal transporter 1 (DMT1) (126). The cytosolic ferrous iron is closely watched by a pool of molecules that constrain its prooxidative activity, and eventually deliver iron to its appropriate targets. These molecules consist of small molecules, such as GSH and macromolecules, such as PCBP and ferritin (127–130). These factors not only involve in iron delivery, but also engage in regulation of ferroptosis via modulating iron-mediated lipid peroxidation.
Ferritin, as iron storage proteins, is one of the most investigated regulators among these factors. Three forms of ferritin are known: ferritin heavy chain (FTH), ferritin light chain (FTL), and mitochondrial ferritin (FTMT) (131, 132). Degradation of ferritin increased cellular iron level, leading to accumulation of ROS and ultimately cell death (133). FTH deficiency downregulated ferroptotic regulator SLC7A11, which reduced GSH and increased lipid peroxidation, and ultimately promoted ferroptosis in cardiomyocytes (134). The protective role of FTMT against ferroptosis has also been detected in a series of investigations (135, 136). FTMT ablation promoted lipid peroxidation and ferroptosis, which deteriorated I/R-induced brain damage. Meanwhile, FTMT ablation potentiated hepcidin-mediated downregulation of ferroportin1, which further increased cellular iron level and promoted ferroptosis (136). In contrast, overexpression of FTMT reduced osteoblastic ferroptosis under high glucose condition (137).
Autophagy-mediated degradation of ferritin or ferritinophagy enhances intracellular iron level and ferroptosis. Erastin-triggered ROS activated autophagy in fibroblasts, which enhanced cellular iron level and promoted ferroptosis through degradation of ferritin and upregulation of transferrin receptor 1 (133). Nuclear receptor coactivator 4 (NCOA4) is an autophagic receptor that mediates the selective degradation of ferritin (138). Inhibition of NCOA4-mediated ferritinophagy antagonizes ferroptosis in various cells (138–140). However, ferritin was also found that can be directly degraded by lysosome in an autophagy-independent manner in cancer cells after artemisinin treatment (141). The released iron further upregulated the expression of siderofexin (SFXN1) on mitochondrial membrane, which transmitted cytoplasmic Fe2+ to mitochondria, leading to ROS production and ferroptosis (142). Besides autophagy, other proteins are also found involved in regulation of ferritin. Nuclear factor erythroid 2-related factor 2 (NRF2) upregulated the transcription of ferritin, which inhibits ferroptosis in various cells (143, 144). During the process, AMPK activated NRF2 (144), while p62 prevented NRF2 degradation and promoted its nuclear translocation (143). miR-335 suppressed FTH expression, exacerbating the neuronal ferroptosis in Parkinson’s disease (145). Prominin2, a pentaspanin protein that is implicated in regulation of lipid dynamics, promoted the formation of ferritin-containing multivesicular bodies and exosomes, which exported iron to inhibit ferroptosis (146).
Transferrin, together with transferrin receptor 1, are responsible for the cellular iron uptake that transport serum iron across the plasma membrane. Transferrin transcripts are rarely detected, except in liver and some cell types in brain. When serum transferrin level decreases, accumulated non-transferrin-bound iron induces damage to tissues, such as liver (147). Yu et al. revealed that transferrin knockout increased the sensitivity of hepatocytes to iron overload-induced ferroptosis and led to liver damage (148). Not limited to hepatocytes, transferrin knockdown also impaired tumorigenic capacity of melanoma cells by inducing ferroptosis, while they became more resistant to drug-induced ferroptosis when transferrin was aberrantly overexpressed (149). In addition, Gao et al. also demonstrated that transferrin itself was an inducer of ferroptosis. Endocytosis of iron-loaded transferrin that mediated by transferrin receptor 1, triggered ferroptosis in MEFs when the cells were upon amino acid starvation (150).
Transferrin receptor 1 regulates the intracellular iron concentration, which is closely correlated with iron-dependent ferroptosis. As an iron sensor, iron-responsive element-binding protein (IREB2) can stabilize transcripts of transferrin receptor 1, thereby increase intracellular iron concentration. Song et al. identified that OTUD1, a deubiquitinase, deubiquitinated and stabilized IREB2, which sequentially promoted transferrin receptor 1-mediated iron endocytosis and led to ROS-dependent ferroptosis (151). Another deubiquitinase, USP7, upregulated transferrin receptor 1 through stabilizing p53 in cardiomyocytes upon I/R injury. The activated USP7/p53/transferrin receptor 1 axis increased iron content and lipid peroxidation, which promoted ferroptosis (152). On the other hand, HUWE1, an E3 ligase negatively regulated ferroptosis via specifically targeting transferrin receptor 1 for proteasomal degradation. Suppression of HUWE1 remarkably enhanced sensitivity of hepatocytes to ferroptosis upon acute liver injury (153).
Ferroportin1 also regulates iron accumulation and associated ferroptosis alone or cooperatively. Ferroportin1 deficiency triggered ferroptosis in neurons, which contributed to multiple neurodegenerative diseases, such as Alzheimer’s disease (AD) and Incidence of ICH (154, 155). A decreased ferroportin1 deteriorates the transferrin receptor 1-mediated ferroptosis by accumulating more iron in ovarian cancer tumor-initiating cells, which made the cells exquisitely sensitive to ferroptotic agents (156).
Besides the factors described above, some other proteins also regulate ferroptosis through modulating iron metabolism. Iron regulatory protein 1 (IRP1) upregulated transferrin receptor 1 and downregulated ferroportin1 and ferritin, which facilitated erastin and RSL3-induced ferroptosis in melanoma cells (157). Yes-associated protein (YAP) is another critical regulator for ferroptosis. As a transcriptional stimulator, YAP promoted ferroptosis by upregulating several ferroptotic modulator including transferrin receptor 1 and acyl-CoA synthetase long chain family member 4 (ACSL4) (158). On the other hand, YAP stimulated the transcription of FTH and FTL with coordination of transcription factor CP2 (TFCP2). Inhibition of YAP or disturbed interaction between YAP and TFCP2 downregulated ferritin, which triggered ferroptosis by boosting labile iron (159, 160). The kinome screen revealed the important role of ATM in regulation of ferroptosis via modulating iron regulators. ATM inhibition enhanced the nuclear translocation of metal-regulatory transcription factor 1 (MTF1), which upregulated the expression of ferritins and ferroportin1. The coordinated changes decreased cellular labile iron and prevented iron-dependent ferroptosis in breast cancer cells upon cystine deprivation and erastin treatment (161). Glutaredoxin 5 (GLRX5) is a protein that transfers mitochondrial iron-sulfur cluster (ISC) to IRP, m-aconitase, and ferrochelatase (162), which counteracted ferroptosis. GLRX5 silencing boosted up iron-starvation response upon sulfasalazine treatment, which increased transferrin receptor 1, but decreased ferroportin1 and ferritin in head and neck cancer cells. The dysregulation of iron metabolism factors enhanced the sensitivity to induced ferroptosis (163).
Iron and other regulated necrosis
Iron overload and resultant ROS also contribute to necroptosis and pyroptosis. Dai et al. described that iron triggered necroptosis in primary cortical neurons, which was rescued by Nec1 (164). Iron-overload also correlates with necroptotic retinal disease. Increased iron and saturated transferrin were found in vitreous and subretinal fluid of patients with retinal detachment (RD), which contributed to induction of necroptosis and poor visual recovery. Meanwhile, overexpression of transferrin decreased iron level and antagonized RD-induced necroptosis (165). Mechanistically, iron-overload was able to increase intracellular ROS and trigger mitochondrial permeability transition (MPT) pore opening, which contributed to RIPK1/RIPK3/MLKL axis-mediated necroptosis in osteoblastic cells (166). Heme, an iron bonded molecule, also participates in the process of necroptosis. Free extracellular heme promoted TNFα production and resultant necroptosis via activation of Toll-like receptor 4 (TLR4) (167). The endocytosis heme was degraded by heme oxygenase-1 (HO-1) and released labile iron, which in turn generated ROS and induced necroptosis in macrophages (168).
Induction of pyroptosis by iron-mediated ROS has also been observed. Iron-activated ROS promoted oxidation and oligomerization of mitochondrial outer membrane protein Tom20 in melanoma cells. Oxidized Tom20 recruited Bax to mitochondria, which facilitated cytochrome c release and activated caspase-3. Then, activated caspase-3 cleaved GSDME and triggered pyroptotic cell death (169). Further study also demonstrated that iron supplement potentiated the anti-tumor effect of clinical ROS-inducing drugs through GSDME-dependent pyroptosis in xenografted melanoma mouse model (169).
Zinc and regulated necrosis
Zinc (Zn) is an essential trace element, required for living organisms and biological processes. As a co-factor, Zn contributes to the catalytic activity of more than 300 enzymes that are actively involved in different levels of cellular signaling pathways including cell survival, proliferation, and differentiation (170). A proteome bioinformatics study even revealed that 10% human proteins were Zn-bonded and majority of them participated in the regulation of gene expression (171). Zn is absorbed by small intestine and excreted through intestine and pancreas (170, 172). Maintaining the homeostasis pf intracellular Zn ensures its binding proteins to function properly. Due to the inefficiency of Zn storage, it is vital for body to uptake this element consistently from daily diet (173), whose deficiency may lead to impairments of immune function, cell growth, cognitive function, and metabolism (174, 175).
Zn and Zn binding protein promote regulated necrosis
Zn and its binding proteins participate in the process of regulated necrosis positively and negatively (Figure 4). As an element, Zn is reported to promote regulated necrosis. High-leveled Zn exposure induced ferroptosis in non-small cell lung cancer (NSCLC) cells (176). Similar ferroptotic cell death was also observed in Zn-treated breast and renal cancer cells, which was rescued by Zn chelator, but not Iron chelator (177). Impaired redox balance contributes Zn compound-triggered ferroptosis. The execution of ferroptosis was attributed to elevation of ROS and lipid peroxidation, along with depletion of GSH and GPX4, and disturbance of iron homeostasis (178, 179). Genetic RNAi screen identified that ZIP7, a protein controls Zn transport from ER to cytosol, mediated Zn-induced ferroptosis. Inhibition of ZIP7 induced ER stress and prevented ferroptosis, whereas this protection was abolished by Zn supplement or depletion of ER stress associated protein, HERPUD1 (177). Autophagy may also contribute to Zn-induced ferroptosis. Qin et al. demonstrated that ZnONP-induced mitochondrial ROS activated AMPK-ULK1 axis, which triggered autophagic receptor, NCOA4-mediated ferritinophagy in endothelial cells (180). Disturbance of ferritinophagy profoundly mitigated ZnONP-induced ferroptosis (180). In addition, ZnONP was also found that selectively activated JNK pathways, which led to increased lipid peroxidation and ferroptotic cell death in neurons (181).
Figure 4. Dual roles of zinc (Zn) in regulated necrosis. ZIP transports Zn from ER to cytosol, which increases Zn level in cytoplasm. The increased Zn inhibits GPX4 and its cofactor GSH, and disturbs the intracellular iron homeostasis, which jointly trigger the accumulation of ROS and lead to ferroptosis. In addition, Zinc finger protein, YY2 inhibits GSH, which also activates ferroptosis. Besides ferroptosis, Zn and zinc finger proteins, ZFP91 and Sp1, facilitate activation of RIPK3 dependent necroptosis. Meanwhile, Zn activates NLRP3 inflammasome. Zinc finger proteins, ZNF377, GLI1, and Sp1 also induce pyroptosis. In the contrary, Zn upregulates GPX4 and GSH through NRF2 and HO-1 to counteract ferroptosis. ZNF498 and A20 also antagonize ferroptosis and necroptosis, respectively.
As the most abundant Zn binding proteins, zinc-finger proteins (ZFPs) involve in modulation of ferroptosis. Yin Yang 2 (YY2) protein manipulated cellular redox homeostasis, which induced tumor cell ferroptosis and suppressed tumorigenesis. Mechanistically, YY2 competed against its homolog YY1 to bind SLC7A11 promoter, which blocked transcription of SLC7A11 and associated GSH biosynthesis (182). Mutation of YY2 zinc-finger domains disturbed the interaction between YY2 and SLC7A11, and abrogated ferroptosis (182). A20 was identified that directly interacted with ACSL4, whose upregulation promoted erastin-induced ferroptosis in endothelial cells (183). MicroRNA, miR-17-92 targeted the A20-ACSL4 axis and prevented ferroptosis (183).
Besides ferroptosis, long-term exposure of Zn gluconate (ZG) was demonstrated that increased NLRP3 and IL-1β in olfactory neurons, which indicated activation of inflammasome and associated pyroptosis (184). Co-exposure of UVB and ZnONPs increased cytosolic and mitochondrial ROS, which triggered NLRP3 inflammasome activation and pyroptosis, accompanying with reduced autophagy and associated exosome release in keratinocytes (185). Zinc finger protein, ZNF377 was frequently silenced in multiple cancer cells, whose restoration promoted pyroptosis via increment of oxidative stress and ER stress (186). Glioma-associated oncogene family zinc finger 1 (GLI1) was upregulated in response to hypoxia exposure, which promoted pyroptosis in pulmonary artery smooth cells by enhancing the transcription of ASC, leading to pulmonary hypertension (187). Sp1, a zinc-finger transcription factor, was identified to promote transcription of zinc finger antisense 1 (ZFAS1), which enhanced LPS-induced pyroptosis and inhibited autophagy in sepsis-induced cardiac dysfunction (188).
Zn transporter, ZIP7 promoted necroptosis, whose knockout decreased the sensitivity of leukemia cells to necroptosis through impairing TNFR trafficking (189). Zinc finger protein 91 (ZFP91) was reported that stabilized RIPK1 through promoting RIPK1’s de-ubiquitination, thereby stabilizing RIPK1-RIPK3 interaction and facilitating necroptosis (190). Meanwhile, ZFP91 also contributed to the production of mitochondrial ROS, whose accumulation promoted TNF-mediated RIPK3-independent necroptosis (190). Sp1 directly regulated RIPK3 expression in cancer cells. Sp1 knockdown significantly decreased the transcription of RIPK3, thereby inhibited necroptosis, which was restored by re-expression of Sp1 (191).
Zn and Zn binding protein inhibit regulated necrosis
Souffriau et al. identified that Zn antagonized TNF-induced necroptosis in Paneth cells via modulating intestinal microbiota. Modified composition of the gut microbiota strongly downregulated interferon-stimulated response (ISRE) genes and IRF genes, ameliorating TNF-induced necroptosis (192). Zn also inhibited neuronal ferroptosis in spinal cord injured mouse model. Zn supplement rescued injured mitochondria and eliminated the accumulation of lipid peroxides through enhancing the expression of antioxidant enzymes, GPX4 and SOD, in a NRF2 and HO-1 dependent manner (193).
Zinc finger protein, A20 inhibited macrophage necroptosis, which prevented inflammatory arthritis in mice. The anti-inflammatory function depended on A20 zinc finger 7 (ZnF7) ubiquitin binding domain, whose mutation damaged A20-dependent inhibition of necroptosis and its anti-inflammatory function in vivo (194). In hepatocellular carcinoma, highly expression of ZNF498 deactivated p53-dependent transcription through blocking PKCδ- and p53INP1-mediated p53 phosphorylation at Ser46, which attenuated ferroptosis (195). Zinc Finger E-Box Binding Homeobox 2 (ZEB2) promoted activation of astrocytes or astrogliosis, which protected neurons by alleviating pyroptosis in ischemia-caused central nervous system injury (196).
Vitamin E and regulated necrosis
Vitamin E family belongs to fat-soluble vitamins, consisting of four tocopherols (α-, β-, γ-, δ-tocopherol) and four tocotrienols (α-, β-, γ-, δ-tocopherol), which are well-known as lipophilic antioxidants (197). Accumulated investigations reveal their important roles in scavenging ROS and suppressing pro-inflammatory signaling (197, 198). Among these natural forms of vitamin E, α-tocopherol (α-Toc) is the predominant one that eliminates cellular lipid peroxides via trapping peroxyl radicals, which prevents ROS related cell death (198, 199).
As an antioxidant, vitamin E was found that cooperated with GPX4 to remove lipid hydroperoxides in cells and animal models (200, 201; Figure 5A). Dietary supplement of vitamin E alleviated GPX4 deficiency-caused oxidative damage in endothelial cells, hepatocytes, T cells, myeloid cells, reticulocytes and neurons (200–205). Lipid peroxidation initiates the execution of ferroptosis. Vitamin E was able to eliminate lipid peroxides that were generated due to GPX4 depletion, which prevented ferroptosis in cultured hematopoietic stem and progenitor cells (206). In neurons, vitamin E supplement also attenuated GPX4 inhibition-mediated ferroptosis, which rescued neurons and improved the cognitive function and mortality (207, 208). Besides cytosolic GPX4, vitamin E also compensated mitochondrial GPX4 (mtGPX4) dysfunction-caused lipid peroxidation. Azuma et al. demonstrated that vitamin E blocked peroxided PE esterified with docosahexaenoic acid and rescued photoreceptor loss in retina of mtGPX4 knockout mice (209).
Figure 5. Vitamins and regulated necrosis. (A) Vitamin E. Vitamin E (VitE) attenuates regulated necrosis through downregulating the intracellular ROS. As lipophilic antioxidants, VitE can directly remove the lipid peroxides that accumulate in the cell. Meanwhile, VitE inhibits the activity of LOXs, which also blocks the lipid peroxidation. (B) Vitamin D. Vitamin D (VitD) activates vitamin D receptor (VDR), which (i) inhibits the formation of necrosome to block necroptosis; (ii) upregulates the expression of GPX4 to inhibit lipid peroxidation and resultant ferroptosis; (iii) inactivates inflammasome directly or via autophagy to inhibit pyroptosis. (C) Vitamin C. Vitamin C (VitC) upregulates the expression of RIPK1, RIPK3, and MLKL, which triggers necroptosis. In addition, VitC triggers lipid peroxidation by (i) inactivating GPX4: (ii) increasing the intracellular ferrous iron. The accumulated lipid peroxides lead to ferroptosis.
Vitamin E was also shown to antagonize ferroptosis through modulating LOX-mediated lipid peroxidation (210). Vitamin E can inhibit LOX activity by either downregulating its expression or competing for its substrate-binding site (199). Kagan et al. demonstrated that LOX-mediated PE oxidation in ER-associated compartment triggered ferroptosis as death signals in GPX4 deficient MEFs. Through suppressing LOX activity, vitamin E (tocopherols and tocotrienols) downregulated oxygenated PE species, preventing against ferroptosis (121). Systematical investigation revealed that α-tocotrienol and its metabolite, α-tocotrienol hydroquinone, inactivated 15-LOX by switching the enzyme’s non-heme iron from Fe3+ to Fe2+, which inhibited ferroptosis (211). In addition, vitamin E also downregulated LOX, but upregulated GPX4 in neurons of epileptic rat model. The restored redox balance attenuated neuronal ferroptosis and improved epileptic conditions (212).
Besides modulating these two enzymes, vitamin E also prevents ferroptosis that is induced directly by iron. Transferrin is responsible to restrain the intracellular iron pool, whose knockout promoted iron-dependent lipid peroxidation and ferroptosis, which weakened tumorigenic capacity of circulating melanoma cells in the bloodstream (149). Hong et al. observed that vitamin E was able to restore the resistance of tumor cells to ferroptotic inducers upon transferrin knockout, which promoted tumorigenesis of melanoma cells (149). Poly rC binding protein 1 (PCBP1) is a cytosolic iron chaperone that binds and transfers iron in cells. Deletion of PCBP1 releases labile iron, which leads to mitochondrial damage, lipid peroxidation and ferroptosis. Vitamin E, alone or together with coenzyme Q, removed iron-dependent oxidative stress and prevented ferroptosis in hepatocytes (213, 214).
In addition to ferroptosis, vitamin E also counteracts other types of regulated necrosis as an antioxidant. Kang et al. showed that lipid peroxidation facilitated caspase-11-dependent GSDMD cleavage and pyroptosis, while administration of vitamin E attenuated lipid peroxidation and resultant pyroptosis in myeloid lineage cells (215). Pretreatment of vitamin E also effectively reduced hydrogen peroxide-induced ROS and protected hepatocytes against pyroptosis (216). For necroptosis, vitamin E destabilized necrosome formation by attenuating ROS, which inhibited SMAC mimetic/TNFα-induced necroptosis in cancer cells (217). Basit et al. also reported that vitamin E ameliorated MPT pore opening and associated intracellular ROS, which blocked necroptosis and ferroptosis in melanoma cells (218).
Vitamin D and regulated necrosis
Vitamin D is also a group of fat-soluble vitamins that contain two forms: vitamin D2 (ergocalciferol) and D3 (cholecalciferol) (219). In addition to oral ingestion from diary supplement, vitamin D can also be synthesized by skin after sun exposure (220). It has been long accepted that the primary role of vitamin D is to promote absorption and metabolism of calcium and phosphate, which maintain bone and muscle health. Recent progress also find that vitamin D deficiency may increase the risk of cancer, autoimmune disease, diabetes, and cardiovascular disease (219). Mechanistically, vitamin D can bind and activate vitamin D receptor (VDR) to regulate gene transcription and signal transduction in virtually every tissue (221).
Accumulated data reveal that vitamin D antagonizes regulated necrosis (Figure 5B). Vitamin D supplement ameliorated mitochondrial damage, enhanced total GPX activity, and reduced cellular iron level, which jointly prevented lipid peroxidation and ferroptosis in zebra fish liver (222). Hu et al. demonstrated that GPX4 was a target gene of VDR. Activated VDR stimulated GPX4 transcription, which removed lipid peroxides and prevented cisplatin-induced ferroptosis in kidney (223). Moreover, vitamin D also decreased Hamp1 (hepcidin-1 precursor) by modulating Keap1-NRF2-GPX4 and NF-κB-hepcidin axis. The decreased Hamp1 upregulated ferroportin1, which exported iron and prevented iron overload (222).
In addition to ferroptosis, serum vitamin D level was observed that negatively correlated with expression of necroptotic factors in IBD patients (224). Further study indicated that cytoplasmic translocation of VDR impeded the formation of necrosome, which suppressed necroptosis and ameliorated structural damage of intestinal epithelial cells in DSS-induced colitis mice (224). Consistent with the observation, RIPK1 was found that formed a complex with VDR and retained VDR in cytoplasm in MEFs and ovarian cancer cells. The formed complex not only blocked transcriptional activity of VDR, but also disturbed the necrosome formation (225).
For pyroptosis, vitamin D deficiency was found that deteriorated renal function by increasing pyroptotic inflammation in acute kidney injury (AKI) patients (226). Vitamin D supplement, on the other hand, restored redox balance and inhibited GSDMD-mediated pyroptosis (226). During the process, VDR was activated to mediate the anti-pyroptotic function of vitamin D. Jiang et al. showed that activation of VDR downregulated the expression of key pyroptotic proteins, such as NLRP3, cleaved caspase-1 and GSDMD, and inflammatory cytokines in cisplatin-injured kidney. Meanwhile, VDR activation inhibited NF-κB signaling via upregulating IκB, which also suggests that vitamin D/VDR alleviates pyroptosis via inhibiting NF-κB pathway (227). Moreover, vitamin D was found that benefited high fat diet (HFD)-induced hepatic injury by diminishing lipid-mediated activation of NLRP3 inflammasome and pyroptosis (228). In oral squamous carcinoma cells, vitamin D relieved platinum-induced pyroptosis by diminishing caspase-3 dependent GSDME cleavage (229). In addition, vitamin D also attenuates pyroptosis via modulating autophagy. Vitamin D was identified that activated AMPK and inhibited mTOR subsequently. The mTOR inhibition rescued high-glucose-induced pancreatic β-cell pyroptosis through blocking the formation of NLRP3 inflammasome (230). Pi et al. reported that vitamin D decreased ROS and activated autophagy, which prevented pyroptosis that induced by hypoxia/reoxygenation (H/R) in trophoblasts (231).
Vitamin C and regulated necrosis
Vitamin C is a water-soluble antioxidant, which efficiently scavenges ROS under various stress conditions (232). It has two states, reduced ascorbate and oxidized dehydro-ascorbate (DHA). Sodium dependent vitamin C transporter (SVCT) family and glucose transporter (GLUT) family facilitate the absorbance of vitamin C along the entire intestine (22). The ascorbate is the predominant form of vitamin C that exists in the body due to its high affinity to the transporters, which contributes to the antioxidant feature of vitamin C (22). For example, ascorbate reduced tocopheroxyl radical to tocopherol, which prevented the generation of lipid peroxides (233). However, autoxidation of ascorbate also paradoxically produces ascorbyl radical, which ultimately generates highly reactive and cytotoxic hydroxyl radicals and hydrogen peroxides though reacting with transition metals. To maintain the balance of pro- and antioxidant activities, ascorbate is strictly regulated through its transporters (234).
Based on these features, pharmacological concentration of ascorbate has been applied to eliminate cancer cells. The cytotoxicity of pharmacological ascorbate includes ROS production and associated lipid peroxidation, which lead to ferroptosis (Figure 5C). Wang et al. reported that ascorbate inactivated GPX4, which led to accumulation of iron-dependent lipid peroxides and triggered ferroptosis in thyroid cancer cells. Meanwhile, ascorbate also promoted ferritin degradation via ferritinophagy. The released iron further deteriorated lipid peroxidation and ferroptosis (235). In addition, vitamin C also coordinates with anti-cancer drugs that synergistically enhances ferroptosis in cancer cells. Ascorbate was shown that potentiated the anti-cancer capacity of sorafenib, an oncogenic kinase inhibitor, by enhancing ferroptosis in liver cancer cells (236). In combination with cetuximab, ascorbate potentiated the cytotoxicity and overwhelmed the acquired resistance of cetuximab by triggering iron-dependent ferroptosis in colorectal cancer cells (237).
In regard to necroptosis, ascorbate exerts dual roles. Ascorbate treatment significantly increased the expression of necroptotic factors, RIPK1, RIPK3, and MLKL, which induced ROS-independent necroptosis in neurons (238). On the contrary, ascorbate, together with N-acetylcysteine (NAC), removed ROS and maintained mitochondrial integrity, which prevented necroptosis in mesenchymal stem cells (239). For pyroptosis, Tian et al. found that ascorbate, in combination with arsenic trioxide, stimulated ROS and promoted inflammasome formation, leading to pyroptosis in leukemia (240).
Besides the vitamins mentioned above, vitamin B6 is also found that involves in regulation of regulated necrosis. Vitamin B6, a water-soluble vitamin, restored the iron homeostasis and promoted the expression of antioxidant enzymes by activating NRF2, which restrained LPS-induced ferroptosis in myocytes (241). Vitamin B6 was also found that induced GSDME dependent pyroptosis in macrophages, but switched to MLKL dependent necroptosis when caspase-8 was blocked (242).
Crosstalk between prooxidant and antioxidant micronutrients in regulated necrosis process
As a set of unstable molecules, cellular ROS are tightly controlled to ensure their appropriate functions. Once they overload, ROS will cause cellular damage and lead to cell death. Accumulated studies have demonstrated the critical role of ROS in signaling pathways of regulated necrosis. Micronutrients are engaged in regulation of intracellular ROS status due to their respective prooxidant or antioxidant properties. Among the trace elements, iron, predominantly known as a prooxidant metal, catalyzes lipid oxidation. On the other hand, vitamin E, Se, and Zn are classified as antioxidant elements. Vitamin E directly halts lipid peroxidation, while Se and Zn prevent ROS formation indirectly (243). Vitamin C has a multiplicity of antioxidant and prooxidant effects (244, 245). Indeed, their crosstalk affects cellular ROS level and the resultant execution of regulated necrosis (Figure 6).
Figure 6. Crosstalk between prooxidant and antioxidant micronutrients in regulated necrosis process. Iron, as a prooxidant, catalyzes generation of ROS via Fenton reaction and LOXs. The antioxidant micronutrients counteract iron-mediated ROS production. Among them, selenium (Se) enhances GPX4 activity, and vitamin E (VitE) inhibits the activity of LOXs. Zinc (Zn) and vitamin D (VitD) attenuate iron-dependent ROS by modulating iron metabolism associated proteins. On the other hand, vitamin C (VitC) not only facilitates reduction of iron ion, but also upregulates iron metabolism associated proteins via IRP-IRE system, which jointly increase the cellular uptake of iron.
As a prooxidant metal, labile iron can directly catalyze free radical formation via Fenton reaction. Meanwhile, iron and iron derivatives can incorporate into ROS-producing enzymes as essential cofactors. Both effects contribute to ROS-dependent regulated necrosis. For instance, iron-activated ROS induced necroptosis and pyroptosis in various cells (166, 169). Iron itself or iron-containing enzymes are able to produce lipid peroxides, which lead to ferroptosis (130). Se, as an antioxidant, antagonizes iron-triggered ROS. Se dependent GPX4-GSH axis attenuates iron-mediated lipid peroxidation and associated ferroptosis. Moreover, Se downregulated iron level in the body. Chareonpong-Kawamoto et al. showed that Se deficiency increased iron concentration and induced iron-overload in both serum and tissues of rat (246). The correlation suggests a negative feedback between Se and iron.
Zn also has a marked impact on iron metabolism. Clinical studies revealed that serum Zn levels positively correlated with serum iron status (247, 248). However, Zn antagonizes iron accumulation in tissues. Mechanistically, Zn deficiency dysregulated the interaction between iron regulatory proteins (IRPs) and their corresponding iron responsive elements (IREs), which upregulated transferrin receptor 1 and ferritin, but downregulated DMT1 in adipocytes (249). Meanwhile, Zn supplement also induced ferroportin1 expression in zebra fish gills (250). It is established that iron is a prooxidant while Zn is an antioxidant due to their respective physicochemical properties (251). The negative correlation between Zn and iron further supports that Zn is able to neutralize iron-derived ROS.
Vitamins also regulate cellular iron uptake and metabolism. Among them, vitamin C is identified as the most important modulator of cellular iron metabolism, which affects iron uptake, storage, and efflux. Ascorbate is known not only to enhance non-heme iron absorption in gut, but also promotes transferrin or non-transferrin dependent cellular iron uptake (252, 253). As an electron donor, ascorbate facilitates the reduction of ferric ions to ferrous ions, which promotes non-transferrin-bound iron cellular uptake and cytoplasmic release of transferrin-bound iron from endosome (253). Besides iron uptake, ascorbate also modulates iron homeostasis through altering the expression of key iron metabolism associated proteins, such as ferritin and ferroportin1 (253). For instance, ascorbate increased ferritin expression through activating IRP-IRE system (254) or by inhibiting lysosomal ferritin degradation (255). However, ascorbate was also found that promoted ferritin degradation through ferritinophagy, which exaggerated iron-mediated lipid peroxidation and resultant ferroptosis (235). Moreover, ascorbate was able to block iron release in various cell types. Although it is still unclear whether this iron efflux is ferroportin1-dependent, ascorbate did increase ferroportin1 expression in intestinal epithelial-like cells (253).
Besides vitamin C, vitamin D was also found that upregulated ferroportin1 via downregulating hepcidin 1, which exported iron and prevented iron overload and iron-dependent ferroptosis (222). Vitamin E, as a potent oxygen radical scavenger, antagonizes iron-derived lipid peroxidation directly or indirectly. On one hand, vitamin E can directly reduce the intracellular iron-derived ROS (149). On the other hand, vitamin E downregulates LOX expression and inactivates their activity, which inhibits lipid peroxidation (121, 211). Both effects prevent iron-dependent ROS propagation and inhibit regulated necrosis.
Conclusion
Regulated necrosis has become an attractive research field due to their causative role in multiple diseases. Pharmacological targeting their signaling pathways may provide alternative opportunities for the therapeutics by either triggering or preventing cell death in diseases. Such as in tumors, triggering of regulated necrosis has been proposed as a routine for effective targeted therapy to overwhelm the apoptotic resistance (256). On the other side, prevention of regulated necrosis may yield encouraging outcomes in diseases, such as IR injury and neurodegenerative disease (257). The recognition that micronutrients actively participate in regulation of regulated necrosis, opens a new avenue for the development of micronutrients as a novel adjuvant therapy. As essential components, micronutrients are involved in modulating metabolism as cofactors or coenzymes, or as antioxidant. Oxidative metabolism produced-ROS can be quenched by micronutrients or their related enzyme systems. Micronutrient deficiency-caused oxidative stress triggers regulated necrosis, which contributes to the etiology of multiple diseases. Appropriate manipulation of micronutrients and associated intracellular ROS benefit diseases by modulating regulated necrosis. A deeper understanding of the crosstalk between regulated necrosis and micronutrients will be instrumental in designing novel and effective therapeutics in order to treat diseases that involve cell death.
Author contributions
LZ and DZ conceptualized and wrote the major part of the manuscript. JL, JW, ZD, MW, and RS reviewed and edited the manuscript. All authors contributed to the article and approved the submitted version.
Funding
This study was supported by grants from Science and Technology Development Program of Jilin Province (20220202056NC) and Science and Technology Research Project of Education Department of Jilin Province (JJKH20210365KJ).
Acknowledgments
We appreciate Hongbo Gao and Bo Pan for proof-reading the manuscript. We thank Daniel Song for the figure improvement.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Glossary
ACSL4, acyl-CoA synthetase long chain family member 4; AIF, apoptosis inducing factor; AIM2, absent in melanoma 2; AKI, acute kidney injury; cIAP1/2, cellular inhibitor of apoptosis protein ½; DAMP, danger-associated molecular pattern; DHA, dehydro-ascorbate; DIAPH3, diaphanous-related formin-3; DMT1, divalent metal transporter 1; FADD, FAS-associated death domain; FTH, ferritin heavy chain; FTL, ferritin light chain; FTMT, mitochondrial ferritin; GLRX5, glutaredoxin 5; GLUT, glucose transporter; GSH, glutathione; GPX4, glutathione peroxidase 4; GSDMD, gasdermin D; HFD, high fat diet; HO-1, heme oxygenase-1; H/R, hypoxia/reoxygenation; IBD, inflammatory bowel disease; ICH, intracellular hemorrhage; IL-1β, interleukin-1β; IL-18, interleukin-18; I/R, ischemia/reperfusion; IRE, iron responsive element; IREB2, iron-responsive element-binding protein; IRF1, interferon regulatory factor 1; IRP, iron regulatory protein 1; ISC, iron-sulfur cluster; ISRE, interferon-stimulated response; LOX, lipoxygenase; LPS, lipopolysaccharide; LUBAC, linear ubiquitination (M1-Ubi) assembly complex; MAPK, mitogen-activated protein kinase; MEF, mouse embryonic fibroblast; miRNA, microRNA; MLKL, mixed-lineage kinase domain-like pseudokinase; MPT, mitochondrial permeability transition; MTF1, metal-regulatory transcription factor 1; NAFLD, non-alcoholic fatty liver disease; NAC, N-acetylcysteine; NCOA4, nuclear receptor coactivator 4; Nec-1, necrostatin-1; NLRC4 NLR, family caspase activation and recruitment domain (CARD) containing 4; NLRP1B, NLR family pyrin domain-containing 1B; NLRP3, NOD-like receptor pyrin domain-containing protein 3; NRF2, nuclear factor erythroid 2-related factor 2; PAMP, pathogen-associated molecular pattern; PCBP1, Poly rC binding protein 1; PCD, programmed cell death; PE, phosphatidylethanolamine; PRR, pattern recognition receptor; PUFA, polyunsaturated fatty acid; PLOOH, phospholipid hydroperoxides; RD, retinal detachment; RIPK1, receptor-interacting protein kinase 1; ROS, reactive oxygen species; RSL3, RAS-selective lethal 3; Se, selenium; Sec, selenocysteine; SECIS, Sec insertion sequence; SEPHS2, selenophosphate synthetase 2; SEPSECS, Sep(O-phosphoserine) tRNA:Sec [selenocysteine] tRNA synthase; SFXN1, siderofexin; SLCA11, solute carrier family 7 number 11; SPB SECIS, binding protein 2; SVCT, vitamin C transporter; TCR, T cell receptor; TFCP2, transcription factor CP2; TLR4, Toll-like receptor 4; TNFα, tumor necrosis factor α; TNFR, TNF receptor; TRADD, TNFR-associated death domain; TRAF2/5, TNFR-associated factor 2/5; TXNRD, thioredoxin reductases; VDR, vitamin D receptor; YAP, Yes-associated protein; YY2, Yin Yang 2; ZFAS1, zinc finger antisense 1; ZG, Zn gluconate; Zn, zinc; ZFP, zinc finger protein.
Keywords: necroptosis, ferroptosis, pyroptosis, selenium, iron, zinc, vitamins, reactive oxygen species
Citation: Zhang L, Liu J, Dai Z, Wang J, Wu M, Su R and Zhang D (2022) Crosstalk between regulated necrosis and micronutrition, bridged by reactive oxygen species. Front. Nutr. 9:1003340. doi: 10.3389/fnut.2022.1003340
Received: 26 July 2022; Accepted: 26 August 2022;
Published: 23 September 2022.
Edited by:
Bin Feng, Sichuan Agricultural University, ChinaReviewed by:
Hongbin Pan, Yunnan Agricultural University, ChinaWeiheng Su, Jilin University, China
Jerry Darsey, University of Arkansas at Little Rock, United States
Copyright © 2022 Zhang, Liu, Dai, Wang, Wu, Su and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Di Zhang, emhhbmdkaUBqbGF1LmVkdS5jbg==