Fangfang Cao1†
Jiali Wang- 1Division of Nephrology, Mianyang Central Hospital, Mianyang, China
- 2Division of Science and Education, Mianyang Central Hospital, Mianyang, China
- 3Hemodialysis Center, Mianyang Central Hospital, Mianyang, Sichuan, China
- 4NHC Key Laboratory of Nuclear Technology Medical Transformation (Mianyang Central Hospital), Mianyang, China
Renal fibrosis, a critical factor in the development of chronic kidney disease (CKD), is predominantly initiated by acute kidney injury (AKI) and subsequent maladaptive repair resulting from pharmacological or pathological stimuli. Phosphatase and tensin homolog (PTEN), also known as phosphatase and tensin-associated phosphatase, plays a pivotal role in regulating the physiological behavior of renal tubular epithelial cells, glomeruli, and renal interstitial cells, thereby preserving the homeostasis of renal structure and function. It significantly impacts cell proliferation, apoptosis, fibrosis, and mitochondrial energy metabolism during AKI-to-CKD transition. Despite gradual elucidation of PTEN’s involvement in various kidney injuries, its specific role in AKI and maladaptive repair after injury remains unclear. This review endeavors to delineate the multifaceted role of PTEN in renal pathology during AKI and CKD progression along with its underlying mechanisms, emphasizing its influence on oxidative stress, autophagy, non-coding RNA-mediated recruitment and activation of immune cells as well as renal fibrosis. Furthermore, we summarize prospective therapeutic targeting strategies for AKI and CKD-treatment related diseases through modulation of PTEN.
1 Introduction
Acute kidney injury (AKI) is a clinical syndrome characterized by acute renal failure and poor clinical prognosis, which results in evident acid–base imbalance, disturbances in water and electrolyte homeostasis, and increases nitrogenous waste products in the blood, known as azotemia (1). The development of AKI is frequently precipitated by risk factors such as ischemia–reperfusion injury, cisplatin exposure, and sepsis (2–4). It is distinguished by tubular cell necrosis, tissue damage, renal dysfunction, and the manifestation of acute kidney failure (5). The pathophysiology of renal injury in AKI encompasses a spectrum of mechanisms including autophagy dysregulation, apoptosis induction, oxidative stress response activation, and inflammatory reactions triggered by direct harm to renal vessels and tubular epithelial cells (6). The duration and severity of AKI are highly associated with the progression toward chronic kidney disease (CKD). Inadequate repair post-AKI leads to alterations characterized by tubular atrophy and interstitial fibrosis, ultimately precipitating CKD which involves an array of multiple cell types including fibroblasts, proximal tubular cell, and immune cells (7). Despite extensive research reports on the molecular mechanisms driving the progression from AKI to CKD, the understanding of its pathogenesis and treatment options remains limited, predominantly due to the intricate interplay of various factors involved in this transition. Thus, it is imperative to elucidate their interconnected roles.
The tumor suppressor, phosphatase and tensin homolog (PTEN), located on chromosome 10, is recognized for its dual-specificity phosphatase activity (8). In physiological conditions, PTEN serves as a critical regulator of the PI3K/AKT signaling pathway in inflammatory diseases, influencing critical biological functions such as angiogenesis, cell survival, and other biological processes (9). As a defender against cancer, PTEN inhibits tumorigenesis and tumor progression across various tumors including gastric, liver, ovarian, and kidney cancers, by modulating key cellular functions like cellular proliferation, apoptosis, migration, and invasion (10–12). Importantly, accumulating evidence underscores the significance of PTEN in kidney diseases, particular emphasis on regulating renal energy metabolism, fibrosis, and podocyte injury (13). Adequate expression of PTEN within renal tissue impedes glomerulosclerosis, tubular epithelial cell transdifferentiation, and extracellular matrix accumulation which contribute to renal fibrosis (14). Moreover, beyond its regulatory effects on regulating immune cell recruitment and activation along with autophagy and mitochondrial function during AKI, PTEN also assumes a pivotal position in CKD induced by impaired repair mechanisms through modulating epithelial-mesenchymal transition (EMT) (15, 16). However, the precise mechanisms underlying the contribution of PTEN to AKI pathogenesis as well as AKI-to-CKD transformation remain largely elusive. This review aims to comprehensively summarize the functions and mechanisms associated with PTEN during pharmacological, ischemia–reperfusion, and sepsis-induced AKI as well as AKI-to-CKD transformation. We also discuss potential therapeutic approaches targeting PTEN for treating both AKI and CKD.
2 Dual roles of PTEN in AKI
The PTEN consists of nine exons and encodes the protein comprising 403 amino acids with phosphatase activity, which dephosphorylates PI3P to PI2P, resulting in the inactivation of the phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway (17). The involvement of PTEN-mediated inflammation and apoptosis in the pathogenesis of ischemia–reperfusion injury (IRI)-induced AKI has been widely reported (18). However, the precise mechanism by which PTEN operates in AKI remains elusive, particularly regarding its expression varies under different AKI-provoking situations, both in physiological and pharmacological conditions. Furthermore, the debate continues whether PTEN exerts a protective effect on renal cells or induces renal injury, and controversies exist in the internal molecular mechanisms underlying PTEN’s role in AKI.
2.1 PTEN promotes autophagy in alleviating AKI
In AKI, renal inflammation is frequently accompanied by the generation of a substantial amount of reactive oxygen species (ROS) and excessive responses to oxidative stress, leading to detrimental effects on mitochondrial structure and function, ultimately exacerbating renal injury (Figure 1) (19). Recent evidence has increasingly demonstrated a close association between autophagy and renal diseases (20, 21). Autophagy represents a dynamic cyclic process wherein damaged or aging macromolecules and organelles within cells are degraded and recycled by proteolytic enzymes in lysosomes to renew cellular components and maintain cellular homeostasis (22). The alterations in autophagy have been extensively documented in AKI induced by cisplatin, ischemia–reperfusion injury (IRI), sepsis, and other risk factors, particularly evident in proximal tubular cells of the kidney (23, 24).
Figure 1. The pathways and molecular mechanisms of PTEN in the progression of AKI. Various pharmacological or pathological factors including ischemia–reperfusion, cisplatin-induced nephrotoxicity, and sepsis, can induce alterations in the expression of SP1 transcription factor, non-coding RNA (ncRNA) molecules, and reactive oxygen species (ROS) within renal tubular epithelial cells. These changes subsequently modulate PTEN expression either positively or negatively. Consequently, the PI3K/AKT/mTOR cascade reaction is triggered and leads to downstream gene modifications associated with inflammation, autophagy, and oxidative stress. Ultimately, these detrimental effects contribute to renal tubular injury and exacerbates AKI. IRI, ischemia–reperfusion injury; Cisp, Cisplatin.
Autophagy plays a dual role in the pathogenesis of AKI. On one hand, autophagy contributes to the repair of renal tubular injury by eliminating reactive oxygen species (ROS) and mitigating mitochondrial dysfunction (25). Moreover, it activates PTEN-induced kinase 1 (PINK1)/MFN2/Parkin-mediated mitophagy in M2 macrophages, and induces autophagy as a protective mechanism for renal tubular cells, which represents a promising approach for improving AKI progression (26). Numerous studies have demonstrated that dynamic changes in autophagy are also crucial for the proliferation and repair of renal tubular cells during the recovery phase following AKI (27). IRI serves as the primary etiology of AKI, leading to necrosis of tubular epithelial cells and triggering an innate immune response (28). Wang et al. (29) established both in vitro and in vivo models of renal IRI using bilateral renal artery IRI mice and HK-2 cell hypoxia/reoxygenation (H/R), and found that downregulation of PTEN expression in IRI-induced kidney injury, with time-dependent inhibition observed after H/R-induced hypoxia. However, reoxygenation did not affect PTEN expression levels. PTEN exerts renoprotective effects against renal IRI by reducing apoptosis in HK-2 cells while enhancing autophagy concurrently (30). The renoprotective mechanism mediated by PTEN involves activation of PI3K/Akt/HIF1-α and PI3K/Akt/mTOR signaling pathways, which, respectively, mitigate apoptosis and enhance autophagy (Figure 1) (31).
Conversely, excessive activation of autophagy hampers the cellular capacity to eliminate oxygen free radicals, leading to apoptosis under severe stress conditions (32). Research has demonstrated that the PTEN inhibitor BpV1 in combination with phosphoinositide phosphatase myotubularin related protein 14 (MTMR14) can attenuate the interaction between PTEN and LC3B, thereby reducing excessive autophagy and preventing cell death caused by its overactivation, which also exhibits neuroprotective effects in cases of ischemic stroke (33). Furthermore, hyperactivation of autophagy contributes to maladaptive repair in AKI, promoting its progression into CKD (34). Interventions involving PTEN inhibitors protect against oxidative stress-induced damage during sepsis-induced AKI recovery in mice; however, overexpression of PTEN yields contrasting results (35). For renal tubular epithelial cells experiencing severe AKI, maintaining a moderate level of autophagy can mitigate mitochondrial damage and facilitate renal function recovery. Additionally, knockdown of PTEN improves tissue dysfunction by enhancing mitochondrial oxidative phosphorylation, particularly through modulation of autophagic flux (36, 37). Therefore, inhibiting the upregulation of PTEN protein mediated by excessive activation of autophagy represents a potential therapeutic approach for alleviating kidney injury-related diseases especially AKI.
2.2 Oxidative stress and inflammation in PTEN-mediated improvement of AKI
The pathogenesis of sepsis-induced AKI involves the interplay of inflammation, oxidative stress, multiple effector cells, and apoptosis as pivotal contributors (38). In septic patients, inflammation not only triggers apoptosis, necrosis, and immune cell recruitment but also exacerbates renal tubular injury by augmenting oxidative stress levels through the generation of reactive oxygen species during the injurious process (39). Therefore, therapeutic interventions targeting oxidative stress, inflammation, and apoptosis hold substantial potential for enhancing outcomes in AKI patients.
Conversely, Zhou et al. presented a contrasting perspective by demonstrating that the upregulation of PTEN expression plays a crucial role in the regulation and protection against AKI induced by ischemia–reperfusion injury (40). In models of AKI induced by ischemia–reperfusion, an increase in PTEN expression was observed, and inhibiting PTEN further exacerbated renal dysfunction following ischemia–reperfusion injury (41). Moreover, Fang et al. (42) also found that PTEN facilitated tubular epithelial cell apoptosis and enhanced Caspase 3 activation in the kidney post-ischemia–reperfusion injury. Conversely, inhibition of PTEN resulted in heightened neutrophil and macrophage infiltration into the kidney, elevated expression of renal inflammatory chemokines and cytokines, ultimately leading to kidney injury (42, 43). Similarly, during renal ischemia–reperfusion and hypoxia in cultured mouse renal cells, miR-687 induced by HIF-1 upregulated PTEN activity to activate the cell cycle and promote apoptosis, which facilitated renal tubular cell proliferation and kidney repair (44). Retaining PTEN attenuated these effects thereby providing protection against kidney injury (9). In summary, PTEN regulates both renal tubular cell apoptosis and inflammation indicating its potential as a therapeutic target for ischemic AKI, modulation of autophagy through gene expression alterations may ameliorate cellular damage in AKI.
2.3 Non-coding RNA (ncRNA)-targeted PTEN in AKI
Aberrant expression of long non-coding RNAs (lncRNAs) has been documented in the peripheral blood of AKI patients, indicating their potential as prognostic indicators for AKI patient survival (45). Specifically, the endogenous antisense lncRNA level in the circulating system can serve as one such indicator. Both lncRNA6406 and PTEN expression exhibited downregulation in an LPS-induced AKI model. Moreover, ectopic overexpression of lncRNA 6,406 significantly upregulated PTEN expression, resulting in attenuation of LPS-induced inflammation, inhibition of oxidative stress and apoptosis, ultimately leading to amelioration of AKI (46). This effect is attributed to the role played by lncRNA 6,406 as a competing endogenous RNA (ceRNA), which sequesters miR-687 and modulates LPS-induced AKI through regulation of the miR-687/PTEN axis (47). Targeting lncRNAs-mediated PTEN may provide a novel therapeutic approach for sepsis-induced AKI with a protective effect. Conversely, elevated levels of PTEN can also contribute to kidney injury in AKI (48). Wang et al. (49) demonstrated that overexpression of miR-22-3p in vivo could downregulate PTEN expression levels and inhibit inflammation, identifying PTEN as a potential downstream functional regulator controlled by miR-22-3p during regulation of sepsis-induced kidney injury (50).
Hypoxia-inducible factor (HIF) levels in ischemia or hypoxia are closely associated with the severity of kidney injury, and accumulating evidence suggests that both HIF and HIF2α exert protective effects in renal ischemia–reperfusion (IR) injury (21, 51). The promoter region of miR-21 contains a binding site for HIF-1α, and miR-21 regulates the expression of HIF-1α by targeting the PTEN/Akt signaling pathway, which is involved in the kidney’s response to IRI (52). Song et al. (53) demonstrated that IRI induces high expression of miR-21 in renal tubular epithelial cells, and inhibition of miR-21 exacerbates AKI. Elevated levels of miR-21 suppress PTEN, activate the AKT/mTOR/HIF pathway, and inhibit apoptosis of renal tubular epithelial cells (Figure 1) (53). Furthermore, miR-21 attenuates kidney injury by inhibiting inflammatory responses mediated by mature dendritic cells through the PDCD4/NF-κB pathway (54, 55).
Cisplatin (Cisp) and other platinum derivatives are currently widely used chemotherapeutic agents for the treatment of solid tumors (56). However, dose-dependent toxicity is a significant adverse reaction (57). PTEN exhibits high expression in multiple organ tissues, and studies have reported that inhibiting PTEN can provide protection to intestinal, neuronal, and cardiomyocyte cells (58–60). Inhibition of PTEN can promote PI3K/Akt activation and exacerbate cisplatin-induced AKI (61). Inhibition of PTEN activity aggravates cisplatin-induced AKI and renal tubular cell apoptosis by further activating caspase 3 and upregulating Bax expression levels, which leads to the blockade of p53 signaling pathway activation, ultimately resulting in inflammatory cell infiltration and production of proinflammatory molecules (41, 62). On the contrary, Huang et al.’s study confirmed reduced PTEN expression in a cisplatin-induced AKI model with involvement of the miR-181a/PTEN axis in curcumin’s protective effect against cisplatin-induced AKI. Curcumin treatment reduces miR-181a expression levels induced by cisplatin while restoring inhibited PTEN expression in vivo (63). Considering the pivotal role of PTEN in the pathogenesis of cisplatin-induced AKI, regulating its activity represents a novel therapeutic strategy for this condition.
2.4 Sp1/PTEN/AKT axis-mediated renoprotection in AKI
The function of PTEN and its downstream proteins is highly dependent on the transcriptional activity of PTEN itself (64). As a critical upstream regulator of PTEN, Sp1 (specific protein 1) belongs to the transcription factor family, which also includes Sp2, Sp3, and Sp4 (61). Sp1 has been closely associated with significant biological processes such as cell growth, differentiation, apoptosis, and carcinogenesis (65). Sp1 inhibits the activity of PTEN by modulating the transcriptional level (66). Furthermore, Sp1 exacerbates diabetic renal tubular injury by binding to the promoter of phosphoglycerate mutase family member 5 (PGAM5) (67). Numerous studies have revealed that SP1 expression and intracellular mitochondrial division are significantly increased in diabetes or hyperglycemia environments (68). Additionally, SP1 is markedly upregulated in type 2 diabetes (T2DM)-induced pulmonary tuberculosis (PTB) (69). Moreover, through Akt activation pathway-mediated signaling cascade regulation mechanism involving SP1 suppresses PTEN transcription while promoting lung injury in T2DM-PTB mice models (70). However, overexpression of PTEN enhances mouse survival rate while reducing inflammatory infiltration, apoptosis, and fibrosis in lung tissue (71).
The downregulation of SP1 expression and upregulation of PTEN expression were observed in the IRI-induced AKI model (72). SP1 modulates autophagy and ameliorates IRI-induced AKI by regulating the miR-205/PTEN axis and mediating the Akt signaling pathway (72). Overexpression of SP1 inhibits the upregulation of PTEN expression, thereby promoting p-AKT activation to mitigate AKI (73). SP1 suppresses mRNA and protein expression of PTEN through repressing transcription at site C (918/913) in the core promoter region of PTEN, while site B (934/929), due to its proximity to the activator binding site (Egr-1) (947/939), cannot mediate SP1 inhibition of PTEN transcription (74–76). Therefore, targeting specific SP1 binding sites on PTEN for selective activation or inhibition may serve as a potential therapeutic strategy for kidney injury-related diseases, and the SP1/PTEN/Akt axis holds promise as a therapeutic approach for ischemia–reperfusion-induced AKI.
3 Regulation of PTEN in CKD
The occurrence and progression of renal tubular injury in AKI could result in either complete or incomplete renal recovery (77). Long-term follow-up data indicate that approximately 25% of AKI patients develop renal fibrosis, leading to the development of CKD (15, 78). CKD is characterized as a global public health issue with an increasing incidence rate, and renal interstitial inflammation and fibrosis are the predominant pathological processes involved in CKD progression, ultimately culminating in end-stage renal disease (ESRD) (79–81). Renal fibrosis is characterized by activated and proliferating fibroblasts, infiltration of inflammatory cells, and atrophy of renal tubular cells (82). Epithelial-mesenchymal transition (EMT) induced by excessive accumulation of extracellular matrix (ECM) proteins, including type I and type III collagen within the renal interstitium represents a critical stage (83, 84). However, effective treatment methods to prevent this process are currently limited. It is crucial to comprehend the pathophysiological mechanisms underlying the occurrence and development of renal interstitial fibrosis while exploring novel strategies for preventing and treating CKD leading to ESRD.
3.1 PTEN regulates fibroblast proliferation and differentiation in AKI-to-CKD transition
The primary target of PTEN is phosphatidylinositol 3,4,5-triphosphate (PIP3) (85). Pharmacological inhibition of PTEN not only regulates PI3K/Akt signaling and exacerbates AKI caused by ischemia–reperfusion but also contributes to the pathogenesis of renal inflammation and fibrosis by modulating the infiltration of myeloid fibroblasts and immune cells into the kidney (15, 86). Studies have demonstrated that myeloid-specific deletion of the PTEN gene in mice leads to severe proteinuria, renal dysfunction, and fibrosis following angiotensin-converting enzyme therapy (87). Furthermore, PTEN can suppress renal inflammation and fibrosis in angiotensin II (AngII)-induced hypertensive nephropathy through the CXCL16/phosphatidylinositol-3 kinase γ (PI3Kγ) signaling pathway (88). Additionally, myeloid-specific deficiency of PTEN enhances extracellular matrix protein production while promoting myeloid fibroblast accumulation and myofibroblast formation after angiotensin-converting enzyme inhibitor therapy, which is accompanied by increased macrophage and T cell infiltration in mouse kidneys (61, 89).
During the transition from AKI to CKD, the activation of pro-inflammatory cytokines can induce an upregulation of non-coding RNA expression, thereby exacerbating renal injury and promoting fibroblast proliferation and differentiation (73, 90). This process is highly dependent on the activation of the Wnt/β-catenin axis and Notch-induced Bmp signaling, which in turn promotes PTEN-mediated inflammatory cell activation of PI3K/AKT/mTOR (91, 92). Additionally, differences in macrophage polarization directly determine the outcomes of kidney adaptive repair. M2 polarization alleviates kidney fibrosis by inhibiting PTEN expression, while M1 polarization accelerates mitochondrial dysfunction and activates Bcl-2/Bax/Caspase-3 signaling, leading to maladaptive kidney repair (93, 94). The aristolochic acid (AA) nephropathy model serves as a representative model for the progression from AKI to CKD, and targeting the NF-κB/miR-382/PTEN/AKT axis can significantly ameliorate AA-induced tubulointerstitial fibrosis (Figure 2) (95).
Figure 2. PTEN governs the process of renal adaptive and maladaptive repair in AKI-to-CKD transition. Upon the initiation of AKI, M1 macrophages undergo polarization to M2 phenotypes within the confines of immunoregulatory capacity, leading to the secretion of anti-inflammatory factors to facilitate adaptive kidney repair, thereby mitigating AKI. Conversely, the undue inhibition of PTEN promotes monocyte polarization toward M1 macrophages, suppresses PTEN expression, induces EMT, and enhances renal interstitial fibrosis. Simultaneously, reduced PTEN levels lead to decreased mitochondrial oxidative phosphorylation and mitochondrial membrane permeability, resulting in mitochondrial dysfunction and apoptosis via the caspase protein cascade. Moreover, severe AKI activates the β-catenin/Notch signaling axis to promote BMP-mediated repression of PTEN along with its receptor BMPR, while suppressing inflammatory responses triggered by the PI3K/AKT/mTOR pathway. The synergistic consequences of these effects severely undermine the kidneys’ capacity for effective adaptive restoration, eventually leading to the progression of CKD. ECM, extracellular matrix; EMT, epithelial-mesenchymal transition; AKI, acute kidney injury; CKD, chronic kidney disease.
3.2 PTEN regulates epithelial-mesenchymal transition (EMT)
The renal tubular epithelium is susceptible to various adverse effects including ischemia, toxicology, and pharmacology (96). Under stressful conditions, injured renal tubular epithelial cells can communicate with mesenchymal cells, particularly fibroblasts, and stimulate their activation and proliferation, thereby contributing to the development of renal fibrosis (97). Previous studies have demonstrated that exosome-mediated miR-21 released by renal tubular cells promotes fibroblast activation in ureteral obstruction-induced hydronephrosis and long-term renal fibrosis models, and the activation occurs through targeting PTEN and thus modulating the PTEN/Akt axis (98). Furthermore, enhancer of zeste homolog 2 (EZH2) enhances EMT by binding to the PTEN promoter and regulating its transcription (99). EZH2 also activates the EGFR/ERK1/2/STAT3 signaling pathway and induces M2 macrophage polarization through STAT6 and PI3K/AKT pathways, which exacerbates renal fibrosis (Figure 2) (15, 100).
Ubiquitination of PTEN is crucial in EMT-mediated renal fibrosis as well. During the progression of CKD, EMT promotes the deposition of interstitial matrix (101). In diabetic kidney disease (DKD) mice with renal tubular injury, there is a significant increase in the level of PtenK27-polyUb (13). When PTEN undergoes polyubiquitination at lysine 80 through MEX3C-mediated K27 linkage, it exhibits a pro-inflammatory effect by promoting the secretion of interleukin-6 (IL-6) and transforming growth factor-beta 1 (TGF-β), thereby exacerbating hyperglycemia-induced EMT (102). The MEX3C-PTENK27-polyUb axis also enhances the dephosphorylation and protein stabilization of fibrosis-related proteins TWIST, SNAI1, and YAP in renal tubular epithelial cells, thus aggravating EMT (103). The concentration of PTENK27-polyUb in urine may serve as a potential prognostic indicator for diabetic disease or patients with renal fibrosis complicated by AKI who exhibit a poor prognosis.
3.3 PTEN affects BMP and its receptors to regulate fibrosis
Vascular calcification presents a major contributor to cardiovascular disease in patients with CKD (104). Elevated serum levels of bone morphogenetic proteins (BMPs), such as BMP-2 and BMP-4, have been identified as potential serum markers for vascular calcification in CKD (105). Moreover, BMP demonstrates renoprotective effects in various acute and chronic kidney injuries, including IRI, unilateral ureteral obstruction (UUO), and streptozotocin (STZ)-induced injury (106). BMP is predominantly expressed in proximal renal tubular cells and glomerular podocytes (107). Importantly, it plays a significant role in fibrosis during the progression from AKI to CKD (108). As an inhibitor of PI3K and BMP-7, BMP-7 suppresses PI3K/Akt signaling by upregulating PTEN expression without altering fibroblast activation or α-SMA expression (109). This counteracts the profibrotic effect of TGFβ1 on cultured renal cells and prevents interstitial fibrosis in both acute and chronic kidney injury (110).
Endothelial dysfunction is commonly recognized as a characteristic step in vascular injury among patients with CKD (111). Recent findings have indicated that PTEN-mediated activation of BMP receptor signaling serves as a potential mechanism contributing to endothelial dysfunction in CKD (112). The activation of BMP receptors plays a conclusive role in the mechanism underlying endothelial dysfunction during early stages of CKD. PTEN, as a key mediator between BMP receptors and endothelial function, assumes an important role in the development of endothelial dysfunction in CKD (91). As a downstream effector molecule activated by BMP receptor signaling, PTEN is upregulated in vascular endothelial cells of mice with CKD, leading to the activation of BMP receptor signaling and inhibition of the Akt-eNOS pathway, subsequently resulting in endothelial dysfunction (113).
3.4 Epigenetic modification mediates PTEN to regulate renal fibrosis
Epigenetic modifications are critically implicated in renal pathologies, exerting substantial influence on the progression of renal fibrosis (114). During ischemia–reperfusion injury, UUO, nephrotoxic drug-AKI, CKD, and the transition from AKI to CKD, epigenetic regulatory mechanisms are activated to varying degrees (103, 115). Histone modification (acetylation and methylation) and DNA methylation are currently the most extensively investigated epigenetic modifications in kidney disease (116, 117). Several histone methyltransferases (HMTs) have been employed to ameliorate renal fibrosis in CKD (118). Studies have demonstrated that activation of epigenetic regulatory factors during diabetic kidney disease progression confers renal protection by restraining inflammation, excessive activation of tubulointerstitial fibroblasts, and fibrosis development (119, 120). In mice with UUO or 5/6 nephrectomy-induced renal fibrosis, there is a notable increase in JMJD3 expression, concomitant with enhanced activities of H3K9 methyltransferase G9a and H3K4 methyltransferase SET7/9 (121). JMJD3 exerts its epigenetic regulation by demethylating H3K27me3 which targets PTEN transcription activation for inhibition (122). The demethylation of H3K27me3 mediated by JMJD3 inhibits AKT phosphorylation through increased PTEN expression, thereby improving renal fibrosis (123). Currently, chemical inhibitors targeting methyltransferases have been reported to significantly reduce the level of H3K9me1 methylation leading to decreased PTEN activity and accelerated renal fibrosis in UUO mice (124).
DNA methylation is a critical epigenetic modification pathway in the progression of kidney-related diseases (125). The methylation of PTEN is highly correlated with the occurrence of CKD, and modulating PTEN activity through DNA methylation also constitutes a fundamental element in genetic modification pathways that affect the progression of CKD (126). PTEN regulates ECM metabolism and impacts the onset and development of CKD-induced fibrosis (Figure 2) (14). PTEN methylation leads to decreased PTEN activity in a mouse model of renal fibrosis induced by UUO (127). Hu et al. (126) has demonstrated that DNA methyltransferases (DNMTs), including DNMT1, DNMT3a, and DNMT3b, are primarily involved in this process. Inhibitors targeting DNMTs can effectively ameliorate abnormal DNA methylation in UUO-induced renal fibrosis (128). DNMT negatively regulates PTEN methylation to modulate the PI3K/AKT signaling pathway (129). Previous studies also demonstrated that pharmacologically reducing the interaction between DNMT3a and PTEN can significantly delay renal fibrosis (128). Additionally, knockdown of DNMT3a restores TGF-β1’s inhibitory effect on PTEN activity in the TGF-β-induced renal fibrosis model mainly through controlling Klotho promoter methylation mediated by DNMT3a (130, 131). Consequently, regulating PTEN activity through epigenetic modification pathways including histone or DNA methylation represents a potential therapeutic approach for improving CKD and kidney diseases.
3.5 PTEN controls phagophore closure and regulates autophagy
Autophagy plays a dual role in the repair of injury from AKI to CKD (Figure 1) (132). Sustained activation of autophagy may lead to tubular atrophy and shedding, thereby promoting renal fibrosis (133). On the contrary, autophagy can prevent renal interstitial fibrosis by degrading excessive collagen within cells (134). Recently, it has been reported that PTEN-mediated adaptive renal repair in proximal renal tubular cells (RPTC) is crucial for delaying the transition from AKI to CKD, and its expression is inversely correlated with markers of renal injury and fibrosis (135, 136). PTEN alleviates renal fibrosis by upregulating phagophore closure mediated by the autophagy-related protein CHMP2A (35). CHMP2A belongs to the SNF7 family which regulates protein transport from endosomes to lysosomes (137). During the initiation of autophagy, CHMP2A translocates to the phagophore and facilitates phagocytic closure, thereby inducing lysosomal recruitment and fusion while separating the inner and outer autophagosomal membranes to form double-membrane autolysosomes or autophagolysosomes (138, 139). Downregulation of PTEN in RPTC inhibits CHMP2A expression, leading to endosome sorting complex required for transport (ESCRT)-mediated membrane shedding in a model of DKD resulting from impaired renal repair after IRI (126). Conversely, PTEN downregulation leads to heightened interactions between LC3-II and P62 proteins and immature autolysosomal organelles, reflecting a bottleneck in the macroautophagy, which is accompanied by increased apoptosis in renal proximal tubular cells and escalated interstitial fibrosis (140).
Currently, the mechanism by which PTEN regulates CHMP2A and influences cell autophagy remains unclear. Several studies have demonstrated that inhibition of the PI3K/AKT pathway using LY294002 (a specific inhibitor of PI3K) does not affect the expression of CHMP2A, indicating that PTEN-mediated autophagy lysosomal generation through CHMP2A is independent of the PI3K/AKT axis (141, 142). Additionally, pronounced decrease in nuclear PTEN levels compared to cytoplasmic levels in a mouse model of renal fibrosis, which primarily due to phosphorylation of PTEN serine 113 mediated by ATM (ataxia telangiectasia mutated serine/threonine kinase), leading to its translocation into the nucleus (143). Nuclear PTEN further triggers cascade activation of the JUN-SESN2/AMPK axis, thereby enhancing autophagy flux (144, 145). It is also evident that differential concentrations of PTEN between the nucleus and cytoplasm impact transcriptional regulation of CHMP2A (140, 146). However, further investigation is required to elucidate their regulatory mechanism. PTEN-mediated CHMP2A could be a novel therapeutic approach for renal fibrosis resulting from AKI progression to CKD.
4 Potential strategies for targeting PTEN to treat AKI and CKD
The selective inhibitor BpV (HOpic) of PTEN has been demonstrated to activate caspase-3 and enhance renal tubular cell apoptosis, exacerbating ischemia–reperfusion injury-induced acute kidney injury (IRI-AKI) (147, 148). Therefore, restoring PTEN expression and function through pharmacological or genetic manipulation pathways represents a promising strategy for mitigating organ damage. Studies have shown that methylation of the PTEN promoter CpG site can target regulatory factors of PTEN to activate and enhance their transcription, thereby inhibiting cancer cell proliferation (40). Similarly, it has been extensively reported that inhibitors targeting the PI3K/PTEN/Akt/mTOR pathway can ameliorate organ injury during cisplatin chemotherapy (149). mTOR inhibitors such as rapamycin and everolimus can effectively protect ovaries from the toxic effects of cisplatin by relying on inactivation of the PI3K/AKT signal mediated by PTEN (150). Currently, drugs (BKM120, AZD-5363 and Olaparib) targeting Class IA PI3K, AKT/p70S6K/PKA or PARP have been used in treating patients with PTEN-defective cancers such as hematologic malignancies, pancreatic and colorectal cancers, which are already tested in phase I to phase III clinical trials (151). However, the use of specific PTEN agonists or small molecule drugs to intervene in the transition of AKI to CKD has not yet been reported in clinical trials. Further exploration is also needed to identify the role of PTEN in kidney diseases.
Recently, genetic intervention to manipulate PTEN has emerged as a promising treatment for AKI and CKD. For instance, the administration of 3-Deazaneplanocin A (DZNep) has been shown to effectively inhibit the specific binding of EZH2 to the proximal promoter of PTEN, thereby reducing the transcription level of PTEN mRNA and improving the pathological damage of CKD (15). It is important to note that recent studies have demonstrated that reversing the transcriptional repression of PTEN in highly invasive tumors such as melanoma through the CRISPR system can effectively inhibit cancer cell proliferation and migration (152). However, it remains unknown whether targeted activation of PTEN mediated by gene editing influences AKI and CKD. Therefore, exogenous PTEN gene modification may offer a potential new therapy to prevent AKI to AKD transition. Additionally, manipulating miR-21 expression and regulating PTEN expression through delivery of antisense oligonucleotides (ASO) or miRNA mimics also holds promise for the treatment in preventing the kidney failure (153).
Renal tubular injury and subsequent regeneration play a pivotal role in determining the recovery from AKI or its progression to CKD (154). Interventions targeting renal tubular regeneration hold significant potential as therapeutic strategies for AKI (155). The upstream transcription factor ZBTB7A regulates the PTEN/AKT pathway downstream of KLF10 protein, thereby augmenting the proliferation and lumen formation capacity of damaged renal tubular cells and promoting renal tubular regeneration in cisplatin-induced AKI (62, 156). Moreover, given PTEN’s regulatory role in apoptosis and autophagy, certain natural plant extracts have been found to enhance PTEN expression and restore impaired autophagy levels (157). These bioactive compounds frequently demonstrate anti-inflammatory, antioxidant, and antifibrotic properties in other disease models (157, 158). Curcumin exerts a protective effect against cisplatin-induced AKI by targeting microRNAs (such as miR-18a and miR-19b), upregulating PTEN expression, improving mitochondrial function, and reducing the release of proinflammatory factors (IL-6, TNF-α, IL-1β) (Table 1) (159–162). However, due to the complex pharmacological effects of natural drugs and the lack of specific PTEN agonists for clinical treatment of AKI, further research is warranted.
Table 1. Summary of recent studies investigating the potential strategies for targeting PTEN in AKI and CKD treatment.
5 Conclusion and future perspectives
The high prevalence of AKI and CKD is often attributed to maladaptive repair processes. Following AKI, the upregulation of proinflammatory cytokines, including IL-1β, TNFα, and TGF-β, is central to the development of renal pathologies such as tubular atrophy, glomerulosclerosis, interstitial fibrosis, renal ischemia, and capillary loss. These clinical manifestations precipitate renal dysfunction, subsequently diagnosed as CKD. PTEN has garnered considerable attention due to its involvement as a lipid phosphatase in various physiological processes including cell proliferation, apoptosis, and fibrosis during the progression of AKI and CKD. The activation of NF-κB and HIF initiates a cascade effect that significantly contributes to the AKI progression. Furthermore, PTEN-mediated interactions among signaling pathways, including PI3K/AKT, TGF-β/Smad, Notch, and NF-κB, has been reported to participate in the EMT process during the transformation from AKI to CKD. In conclusion, serum PTEN concentration emerges as a potential biomarker for assessing the severity of AKI and its progression to CKD. Targeting PTEN to modulate non-coding RNA expression, autophagy, and oxidative stress in renal tubular cells emerges as an effective strategy for alleviating kidney injury. Future research focused on uncovering the functions and mechanisms of PTEN in kidney diseases holds substantial promise for elucidating the pathophysiology of both AKI and CKD, thereby paving the way for novel therapeutic strategies.
Author contributions
FC: Writing – original draft. YYL: Writing – original draft. TP: Writing – original draft, Software, Data curation. YML: Writing – original draft, Validation, Data curation. LY: Writing – original draft, Formal analysis, Data curation. LH: Writing – original draft, Software, Data curation. HZ: Writing – original draft, Software, Data curation. JW: Writing – review & editing, Funding acquisition.
Funding
The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This study was supported by the Science & Technology Department of Sichuan Province (2023NSFSC0603).
Acknowledgments
Thank you to associate researcher Zhou Yongjie from the Liver Transplantation Center of West China Hospital of Sichuan University for his guidance on the article.
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.
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Keywords: CKD, PTEN, AKI, AKI-to-CKD, kidney
Citation: Cao F, Li Y, Peng T, Li Y, Yang L, Hu L, Zhang H and Wang J (2024) PTEN in kidney diseases: a potential therapeutic target in preventing AKI-to-CKD transition. Front. Med. 11:1428995. doi: 10.3389/fmed.2024.1428995
Edited by:
Madhulika Sharma, University of Kansas Medical Center, United StatesReviewed by:
Ivonne Löffler, University Hospital Jena, GermanyPamela Tran, University of Kansas Medical Center, United States
Copyright © 2024 Cao, Li, Peng, Li, Yang, Hu, Zhang and Wang. 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: Jiali Wang, 18781610712@163.com
†These authors have contributed equally to this work and share first authorship