Haiwen Li
Lingqiang Zhang
Lei Zhang
Renzhi Han- 1Department of Surgery, Davis Heart and Lung Research Institute, Biomedical Sciences Graduate Program, Biophysics Graduate Program, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- 2State Key Laboratory of Proteomics, National Center of Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, China
- 3Department of Anatomy and Neurobiology, Shanghai Yangzhi Rehabilitation Hospital, Shanghai Sunshine Rehabilitation Center, School of Medicine, Tongji University, Shanghai, China
Impaired biomolecules and cellular organelles are gradually built up during the development and aging of organisms, and this deteriorating process is expedited under stress conditions. As a major lysosome-mediated catabolic process, autophagy has evolved to eradicate these damaged cellular components and recycle nutrients to restore cellular homeostasis and fitness. The autophagic activities are altered under various disease conditions such as ischemia-reperfusion cardiac injury, sarcopenia, and genetic myopathies, which impact multiple cellular processes related to cellular growth and survival in cardiac and skeletal muscles. Thus, autophagy has been the focus for therapeutic development to treat these muscle diseases. To develop the specific and effective interventions targeting autophagy, it is essential to understand the molecular mechanisms by which autophagy is altered in heart and skeletal muscle disorders. Herein, we summarize how autophagy alterations are linked to cardiac and skeletal muscle defects and how these alterations occur. We further discuss potential pharmacological and genetic interventions to regulate autophagy activities and their applications in cardiac and skeletal muscle diseases.
Introduction
Autophagy is an evolutionarily conserved, catabolic process that digests undesirable cytoplasmic components and organelles in the lysosomes, allowing the cell to reuse the materials and maintain cellular homeostasis. Numerous studies have demonstrated the crucial roles of autophagy in many biological processes, such as development, aging, and immune responses (1–5). Emerging evidence has linked aberrant autophagy execution to many human diseases, such as cardiomyopathies and muscular dystrophies (1–5).
Based on the cargo sequestration methods, autophagy can be classified into three primary types: microautophagy, macroautophagy, and chaperone-mediated autophagy. Macroautophagy (henceforth termed autophagy) is well characterized among these types. Cells can sequester cytosolic materials into double-membrane vesicles (known as autophagosomes), and degrade these cargos by fusing with lysosomes during this process (6) (Figure 1). Based on the cargos, autophagy can be separated into bulk autophagy and selective autophagy such as ER-phagy, aggrephagy (7), and PINK1 (PTEN-induced kinase 1)/PRAK2 (parkin RBR E3 ubiquitin protein ligase)-mediated mitophagy (8) (Figure 2). This review mainly focuses on bulk autophagy and mitophagy in striated muscle diseases.
Figure 1. Autophagy process in mammalian cells. For autophagy initiation, environmental factors and metabolic stimuli are sensed by AMPK or mTORC1. The autophagic cargo undergoes a serial of processes, including the phagophore and autophagosome formation, autolysosome development before the cargo is degraded, concomitant with lysosome and autophagosome recycling. Once autophagy is induced, ULK1 is activated and then associated with the class III PI3K complex, eliciting the production of PI3P on the phagophore membrane, which further recruits WD repeat domain phosphoinositide-interacting protein 2 (WIPI2) and double FYVE domain-containing protein 1 (DFCP1). Next, the ATG12-ATG5-ATG16L1 complex binding to WIPI2 is responsible for providing membranes from other organelles, including the plasma membrane, mitochondria, recycling endosomes, and Golgi complex. Then, ATG9 drives membrane expansion by delivering phospholipids. Moreover, the ATG12-ATG5-ATG16L1 complex promotes the conjugation of LC3, in which ATG4 cleaves LC3 to generate LC3-I, which further covalently bonds with phosphatidylethanolamine for LC3-II formation. LC3-II is a specific marker of autophagy where autophagosome-residing LC3-II can specifically associate with autophagy receptors with LC3-interacting motifs like p62. Finally, autophagosome-lysosome fusion is commonly mediated by UV radiation resistance-associated gene protein (UVRAG), homotypic fusion and protein sorting (HOPS), syntaxin-17 (STX17), vesicle-associated membrane protein 7/8 (VAMP7/8), synaptosome associated protein 29 (SNAP29), PLEKHM1, and the trafficking protein Rab-7. Concomitant with cargo removal, autophagosome effector proteins are either degraded or recycled by the Sorting Nexin 4/5/17 (SNX4/5/17) complex, and lysosomes maybe undergo the INPP5K-mediated ALR process.
Figure 2. Selective autophagy. Selective autophagy delivers specific cargos for degradation and recycling, such as protein aggregates, mitochondria, and endoplasmic reticulum. The recognition of these cargoes requires selective autophagy receptors specifically binding LC3-II of autophagosomes and are thereby removed by lysosomes. CASA is a selective tension-induced autophagy pathway mediated by BAG3. Moreover, mitophagy is divided into two branches: the classical PINK1/PRAK2-mediated process and alternative mitophagy mediated by Rab9. Other types of selective autophagy include aggrephagy, ER-phagy, lipophagy et al.
As indicated in Figure 1, autophagy is a multiphasic process that involves the sequential and selective recruitment of autophagy-related (ATG) proteins. The complex process includes initiation/nucleation, phagophore formation, autophagosome formation, autophagosome-lysosome fusion, cargo degradation, and autophagic lysosome reformation (ALR) or emerging autophagosomal components recycling (ACR) (9). Different ATG proteins or complexes are involved in these steps. As shown in Figure 3, key upstream regulators of this process include the major inhibitor mammalian target of rapamycin (mTOR) and the primary activator AMP-activated kinase (AMPK). The main downstream phosphorylation substrates of AMPK are Unc-51-like kinase (ULK1) (10) and Forkhead box protein O (FoxO) (11, 12), in which the former is a crucial initiator of autophagy and the latter regulates the transcription of genes related to autophagy. Moreover, mTOR, particularly mTOCR1, suppresses autophagy through phosphorylating ULK1 at different sites (10) and transcription factor EB (TFEB)/transcription factor E3 (TFE3), two key proteins of lysosome biosynthesis (13, 14). The details of the autophagy process have been well reviewed in other studies (4, 15).
Figure 3. The regulatory signaling pathways of autophagy. AMPK and mTOR are the major positive and negative regulatory signaling pathways of autophagy, respectively. Once AMPK is activated, the downstream substrate ULK1 is phosphorylated, and FoxO transcription factors are translocated into the nucleus to promote the expression of autophagic genes. Conversely, mTOR blocks autophagic initiation by negatively phosphorylating ULK1 and inhibits lysosome biosynthesis by blocking TFEB/TFE3 translocation into the nucleus.
The role of autophagy in various pathophysiological processes has spurred great efforts toward identifying clinically druggable autophagic targets to prevent or cure human diseases, including cardiac and skeletal myopathies. Here, we systematically summarize the current insights into the role of autophagy in human diseases related to striated muscle and therapeutic strategies in preclinical development.
Aberrant autophagy in heart diseases
Heart disease is the leading cause of morbidity and death worldwide (16). Adult cardiomyocytes, the essential cellular component of cardiovascular system, are mostly long-lived and rarely renewed, implying that these cells heavily rely on intact autophagy to remove impaired proteins and organelles during their long life (5). Aberrant autophagy can lead to various heart defects.
Bulk autophagy in heart diseases
As illustrated by the genetic models of several essential or ancillary genes related to autophagy (Table 1), autophagy aberration predisposes the organisms to develop heart disorders under either basal or stress conditions (1, 17). For instance, three different cardiomyocyte-specific ATG5 conditional knockout (KO) mouse models display left ventricular dilatation and cardiac dysfunction without or with pressure overload (18, 19). Vacuolar protein sorting 34 (Vps34) negatively correlates with human hypertrophic cardiomyopathy (HCM) characterized by thickening of the heart muscle, in consistence with the observation that disruption of Vps34 causes cardiac hypertrophy in mice by accumulating ubiquitinated Crystallin Alpha B (CryAB) (20). Muscle-specific conditional KO of ATG14 causes early death and HCM with abnormal accumulation of autophagic cargoes in heart (21). Moreover, other core autophagy factors such as Beclin-1 (22), mTORC1 (23–25), and PLEKHM2 (Pleckstrin Homology and RUN Domain Containing M2) (26) are also essential for cardiac homeostasis, and their ectopic activity can cause heart defects.
Table 1. Autophagy in heart diseases.
A large body of evidence has shown that alterations in regulatory proteins related to autophagy compromise cardiac function by modulating the core autophagy machinery. For example, mice with a disruption in lysosomal-associated transmembrane protein 4B (LAPTM4B) are susceptible to ischemia-reperfusion (I/R) injury by repressing mTORC1-mediated TFEB transcription (27). Upregulation of immunoproteasome catalytic subunit β5i leads to cardiac hypertrophy and heart failure (HF) by promoting ATG5 degradation (28), while Nrf2 ablation slows the progression of diabetic cardiomyopathy (DC) in cardiomyocyte-specific ATG5 KO mice (29). G protein-coupled receptor kinase 4 (GRK4) aggravates cardiomyocyte injury during myocardial infarction (MI) by inhibiting histone deacetylase 4 (HDAC4)-mediated Beclin-1 transcription, while MI-induced cardiac dysfunction and remodeling are improved by deleting cardiomyocyte-specific GRK4 (30). Moreover, other regulatory factors of autophagy, including KAT8 Regulatory NSL complex subunit 1 (KANSL1) (31), Lysosome-associated membrane protein 2 (LAMP2) (32–34), insulin-like growth factor 1 receptor (IGF1R) (35) and HDAC (36, 37), also play imperative roles in maintaining cardiac fitness, and their abnormality leads to heart diseases. These findings demonstrate that autophagy is important for cardiac function. However, in some cases, overactivation of autophagy can compromise cardiac fitness. For example, cardiac-specific knockout of the genes encoding the lysosomal proteins Rag family protein A/B (RagA/B) causes lysosomal storage disorder characterized by increased autophagosome accumulation due to the activation of yes-associated protein 1 (YAP1)-TFEB transcription (38). Furthermore, cardiomyocyte-specific transgenic thrombospondin-1 (Thbs1) mice develop lethal cardiac atrophy due to overactivation of PERK/ATF4-mediated autophagy (39).
MicroRNAs (miRNAs) and long non-coding RNAs (lncRNAs) can modulate the expression of autophagy-related proteins and pathways (40) and are potential druggable targets for heart disease treatment (41). miR-221 induces HF by inhibiting mTOR-mediated autophagy, while rapamycin treatment abolishes the miR-221-induced suppression of autophagy and cardiac remodeling (42). The defective autophagic response and HF are caused when FoxO3 is inhibited by cardiomyocyte-specific overexpression of miR-212/132 (43) or mTORC1 is activated by miR-199a (44). Moreover, the suppression of lncRNA Gm15834 mitigates autophagy-mediated myocardial hypertrophy by downregulating ULK1 in mice (45).
Chaperone-assisted selective autophagy in heart diseases
The chaperone-assisted selective autophagy (CASA) machinery consists of the chaperones heat shock protein 70 (HSC70), heat shock protein beta-8 (HSPB8), co-chaperone Bcl2-associated athanogene 3 (BAG3), STIP1 homology and U-Box containing protein 1 (STUB1), and autophagic receptor sequestosome-1 (SQSTM1, also known as p62). CASA primarily mediates the autophagic degradation of filamin C, which is involved in actin–actin and actin–integrin interactions in muscle tissues (46, 47). Emerging evidence has demonstrated that BAG3 plays an essential role in maintaining cardiac function (46, 47). Human BAG3P209L-eGFP expression in mice causes the disintegration of Z-disc, accumulation of protein aggregates and development of early-onset restrictive cardiomyopathy with increased mortality, in line with the observation in BAG3P209L patients (48, 49). Histological and biochemical assays revealed the alterations in protein quality control system and autophagy in heart tissues from BAG3P209L-eGFP transgenic mice and patients (48, 49). Similarly, compromised CASA impairs cardiomyocyte contractility and leads to HF in BAG3 heterozygous KO mice (50). A recent study showed that loss-of-function of BAG5 (one of the BAG3 paralogs) also led to dilated cardiomyopathy (DCM), which is characterized by enlargement and dilation of the ventricles along with impaired contractility, in mice and humans partly by disrupting the interaction with HSC70 (51).
Mitophagy in heart diseases
Defects in mitophagy, a selective autophagy targeting mitochondria, have been closely linked to cardiac disorders (1). The classic PINK1/PRAK2-mediated mitophagy is essential for cardiac mitochondrial fitness and protects the heart from cardiomyopathy (52). Once mitochondria are damaged, PINK1 is increased and activated by autophosphorylation on the outer mitochondrial membrane (OMM). Activated PINK1 further phosphorylates ubiquitin, promoting the ubiquitin E3 ligase PRAK2 recruitment to mitochondria. Meanwhile, phospho-ubiquitin recruits and binds with autophagy receptors to initiate autophagosome formation. Parkin functions as an amplifier of mitophagy through further ubiquitination of mitochondrial proteins.
Park2 global knockout mice display a decrease in survival and develop larger infarcts than wild-type (WT) mice after MI (53), and cardiomyocyte-specific deletion of Park2 manifests cardiac hypertrophy at birth and early lethality (54). Systematic knockout of Pink1 leads to left ventricular defects and age-dependent cardiac hypertrophy by compromising mitochondrial fitness and increasing oxidative stress (55). Additionally, heart defects are also observed in the mouse models related to other key mitophagy factors, such as double KO of Bcl2 interacting protein 3 (BNIP3) and Bcl2 interacting protein 3 (Nix/BNIP3L) (56), cardiomyocyte-specific KO of mitophagy receptor Mitofusin 2 (Mfn2) (57), and inducible double KO of cardiac Mfn1/2 (58). As expected, the impairment in classic autophagy machinery including ATG5 (59, 60), ATG7 (61) as well as AMPKα2 (62) causes heart defects by altering mitophagy. In addition to the core components, the maintenance of heart fitness also requires the involvement of some other regulatory proteins of PINK1/PRAK2-mediated mitophagy such as TAM41 Mitochondrial Translocator Assembly and Maintenance Homolog (TAMM41) (63), acetyl-CoA carboxylase 2 (ACC2) (64), tumor protein p53 (p53) (65), Ras homolog family member A (RhoA) (66), and succinate dehydrogenase assembly factor 4 (SDHAF4) (67).
Mitophagy also plays a crucial role in preventing diabetes-induced cardiomyopathy (68), particularly for ULK1/Rab9 (Ras-related protein 9)-mediated mitophagy (69). As an alternative mitophagy, energy stress activates AMPK-mediated phosphorylation of Ulk1. Phosphorylated Ulk1 interacts with and further phosphorylates the Golgi-derived membrane-associated Rab9. Phosphorylated Rab9 forms a complex with receptor interacting protein kinase-1 (Rip1) and dynamin-related Protein 1 (Drp1), thereby catalyzing the phosphorylation of Drp1 by Rip1. Mitochondria with phosphorylated Drp1 are recognized and engulfed by Rab9-associated membranes, and finally degraded by lysosomes. Recent studies showed that Ulk1/Rab9-mediated mitophagy protected the heart against ischemic damage (70) and obesity-associated cardiomyopathy (71) in mice.
Targeting autophagy for the treatment of heart diseases
The abovementioned evidence indicates that autophagy is essential for cardiac homeostasis and function. Stimulation of autophagy can protect against cardiac defects, as supported by the fact that several autophagy activators manifest a potent therapeutic potential for cardiac disorders (72) (Figure 4 and Table 2).
Figure 4. The potential autophagic targets for striated muscle disease treatment. The diagram includes current drug candidates (small molecules, peptides, ASO, and gene therapy) that act at different stages of the autophagy and might be beneficial in heart or skeletal muscle diseases.
Table 2. Targeting autophagy for striated muscle disease treatment.
The autophagy agonist spermidine, a natural polyamine usually found in mammals, exerts cardioprotective effects including a decrease in cardiac hypertrophy and maintenance of diastolic function in mice and rats (73). Trehalose, a natural non-reducing disaccharide, significantly reduces ischemic remodeling, cardiac dysfunction, and HF in a chronic MI mouse model by activating TFEB-mediated autophagy (74). Anthracycline, including doxorubicin (DOX), is an effective antitumor drug, but the dose-dependent cardiotoxicity limits its application. Recent findings have revealed that anthracycline-induced cardiotoxicity (AIC) was associated with autophagy suppression (75). The Food and Drug Administration (FDA)-approved autophagy activators such as spironolactone, pravastatin, and minoxidil can mitigate AIC by activating ATG7-dependent autophagy (75). Moreover, the beneficial effects of treating autophagy-related heart diseases are also observed with other reagents, like rapamycin for cardiac hypertrophy (44), a rapamycin analog temsirolimus for LMNA-related heart defects (76), an FDA-approved HDAC inhibitor SAHA for MI (77), and a DNA demethylating agent 5-aza-2′-deoxycytidine for the heart defects related with Danon disease (78).
Emerging studies have shown that gene therapy may offer a promising approach for heart disease treatment. AAV9-Ghrelin preserves cardiac function and reduces infarct size after MI, via activating autophagy and eradicating damaged mitochondria after MI (79). The overexpression of rAAV9-BAG3 decreases infarct size and improves left ventricular function after I/R injury by activating autophagy and apoptosis (80). Moreover, similar improvements are also observed in AAV9-BAG3 for HF (48), AAV9-BAG5 for DCM (51), AAV9-LAMP2 for Danon disease (81), AAV9-AMPK α2 for transverse aortic constriction (TAC)-induced chronic HF (62), a cell-permeable Tat-Beclin-1 peptide for LPS-induced heart defects (22) and I/R injury (82).
Almost all aspects of cardiac cell function are regulated by a massive series of non-coding RNAs, including miRNAs and lncRNAs (41). Targeting non-coding RNAs of interest provides innovative therapeutic approaches for heart disease treatment by delivering short, antisense oligonucleotides (ASOs). Specific antagomirs against miR-132 safeguard against pressure-overload-induced HF by modulating FoxO3-mediated autophagy (43). As antimiR-132 (also known as CDR132L) shows high therapeutic efficacy in the mouse and pig models of HF (83, 84), this compound has recently entered the clinical trial stage in HF patients (85). LncRNA Chast induces cardiomyocyte hypertrophy and pathological heart remodeling in mice, as Chast impedes cardiomyocyte autophagy by negatively regulating the expression of the autophagy regulator PLEKHM1. Silencing of LncRNA Chast with ASO prevents and improves TAC-induced adverse cardiac remodeling without early signs of toxicity (86). Moreover, silencing of LncRNA 2810403D21Rik/Mirf mitigates cardiac injury and improves heart function in MI mice by promoting miR26a/USP15-mediated autophagy (87).
Aberrant autophagy in skeletal muscle diseases
Appropriate autophagy is not only essential for cardiac muscle homeostasis and function, but also for maintaining skeletal muscle structure and fitness under basal and stress conditions (88, 89). Autophagy defects lead to various skeletal muscle diseases, as shown in Table 3. Mutations in the core genes related to the autophagy process lead to muscle diseases, as evidenced by the fact that muscle-specific ATG7 deletion results in severe muscle atrophy and an age-dependent decline of force in mice (90) and muscle weakness in human patients (91). Similarly, mice with conditional knockout of ATG5 in skeletal muscle exhibit pronounced muscle wasting, kyphosis, and growth retardation (92). Interestingly, muscle-specific knockout of Vps15 causes the symptoms of autophagic vacuolar myopathy (AVM) with remarkable glycogen accumulation (93). Moreover, skeletal muscle defects are also caused by the mutations of other key autophagic genes, like Pik3c3 (also known as Vps34) (94), Atg14 (21), Ulk1, and Ulk2 (95). This notion that autophagy is required for muscle fitness is further substantiated by human skeletal muscle diseases with aberrant autophagy and/or accumulation of damaged organelles, such as sarcopenia, muscular dystrophies, and other myopathies (2, 4, 89, 96).
Table 3. Autophagy in skeletal muscle diseases.
Autophagy in sarcopenia
Sarcopenia, which commonly occurs in elders, is a progressive skeletal muscle disorder characterized by the accelerated loss of muscle mass and function closely linked to increased health concerns, including falls, functional decline, frailty, and even mortality (96). The etiology of sarcopenia is associated with multiple factors, including defective autophagy, where a time-dependent decline in autophagy activity causes stemness impairment in muscle satellite stem cells (96, 97). This tenet is further supported by recent findings demonstrating that suppression of the prostaglandin-degrading enzyme 15-hydroxyprostaglandin dehydrogenase (15-PGDH or HPGD) slowed sarcopenia progression partly through activating autophagy (98) and that exerkine apelin reversed sarcopenia partially by triggering autophagy in mice and humans (99). Autophagy contributes to the maintenance of muscle mass and strength mediated by Sestrins 1–3 in aging mice (100). Glycogen synthase kinase-3 alpha (GSK3α) and Tyrosine-protein kinase (Fyn) are also involved in age-related alterations in sarcopenia by modulating autophagy (101, 102). Furthermore, mitophagy impairment has been associated with sarcopenia, as supported by the observation that the impairment of genes related to mitochondrial fusion or fission contributed to age-dependent muscle degeneration (103). For example, age-dependent loss or genetic disruption of Mfn2 in mouse skeletal muscle causes sarcopenia via inhibition of mitophagy (104).
Autophagy in muscular dystrophy
Duchenne muscular dystrophy (DMD) caused by DMD gene mutations is the most common childhood form of muscular dystrophy, with approximately 1 in 5,000 male births worldwide (105). DMD codes for the dystrophin protein, a cytoskeletal protein that functions in the muscle force transmission and sarcolemmal stability of muscle fibers. Loss of dystrophin leads to progressive muscle weakness and wasting, loss of ambulation, respiratory impairment, cardiomyopathy, and eventual death. A previous study demonstrated that autophagy was defective at late stages of disease progression in Dmd mice and DMD patients (106) and that autophagy impairment correlated with the decline in muscle regeneration and the increase in fibrotic tissue deposition in dystrophic muscles by modulating satellite cell activity (107). Autophagy induction is impaired as mTOR is constitutively activated, leading to the downregulation of LC3, Atg12, Bnip3, and Gabarapl1 in mdx mice (106). Moreover, PINK1/PRAK2-mediated mitophagy deficits also contribute to dystrophic phenotypes in a mdx mouse model (108).
Limb-girdle muscular dystrophies (LGMDs), the fourth most prevalent genetic muscle disease, are a group of genetically heterogeneous disorders characterized by progressive muscle weakness (5). LGMDs have more than 30 subtypes with variable severity and time of onset, and the pathological mechanism of some types has been associated with aberrant autophagy (109). LGMDR8 (110), characterized by impaired muscle regrowth and atrophy, is caused by mutations in the ubiquitin ligase Tripartite motif-containing protein 32 (TRIM32). TRIM32 is required for autophagy induction in response to atrophic stimuli in vivo by catalyzing unanchored K63-linked polyubiquitin of ULK1 and promoting the interaction of ULK1 with autophagy/Beclin 1 regulator 1 (AMBRA1) (111). LGMDR9 is an autosomal recessive disorder defined by proximal muscle weakness, calf hypertrophy, hypotonia and elevated CK level. LGMDR9 is caused by mutations in the fukutin-related protein gene (FKRP) encoding a glycosyltransferase involved in α-dystroglycan modification. A recent finding showed that Atg7 and LC3B-II were markedly increased, but p62 and mTOCR1 were decreased in LGMDR9 patients, indicating that autophagy activation has been linked with disease development (112). Conversely, another study found that autophagy was downregulated in patient-specific LGMDR9 iPSC-derived myotubes (113). LGMDR2 caused by DYSF mutation is an autosomal recessive disease, characterized by muscle inflammation, fibrosis and progressive weakness in the hip and shoulder area (114, 115). LGMDR2 patients display elevated LC3-II, p62, and Bnip3 levels (116).
Mutations of COL6A1 encoding collagen type VI has been linked to Ullrich congenital muscular dystrophy (UCMD) characterized by early-onset and generalized muscle weakness, and Bethlem myopathy (BM) characterized by proximal muscle weakness and flexion contractures. Autophagy defects are observed in Col6a1 deficient mice, in which abnormal AKT-mTOR pathway signaling pathway lowers the induction of Beclin-1 and Bnip3 and impairs autophagosome formation in muscle fibers (117). The massive accumulation of autophagosomes can cause autophagic vacuolar myopathies (AVMs) such as Danon disease (DD) and Pompe disease (4, 118). The causative defect of LAMP2 leads to Danon disease characterized by weakening of myocardial and skeletal muscles (32). Disruption of LAMP2 expression blocks the normal maturation of autophagosomes in Lamp2-deficient mice and impairs the fusion of autophagosome with lysosome in LAMP2-deficient human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) (34, 119, 120). Furthermore, the mutations in GAA encoding an acid alpha−glucosidase cause Pompe disease characterized by abnormal buildup of glycogen and muscle weakness. The fusion of autophagosome-lysosome is suppressed while autophagy initiation is induced in GAA mutant mouse model (92).
Although the abovementioned muscular dystrophies are associated with defective autophagy, excessive autophagy could cause muscular dystrophies (89, 121). Congenital muscular dystrophy type 1A (MDC1A) is caused by mutations in LAMA2 encoding the laminin α2 chain. MDC1A is characterized by clinically profound muscle hypotonia and progressive muscle weakness accompanied by contractures (122). Excessive autophagy appears to exacerbate the dystrophic pathologies in the Lama2-deficient mouse model and MDC1A patient tissues (123), as evidenced by the observation that a autophagy inhibitor 3-methyladenine (3-MA) improves MDC1A (123). However, the detailed relationship between Laminin α2 and autophagy remains elusive due to a lack of autophagic dynamics.
Autophagy in other myopathies
Mitochondrial myopathies (MM) are clinically and biochemically heterogeneous disorders characterized by ragged red fibers and peripheral and intermyofibrillar accumulations of abnormal mitochondria (124). The skeletal muscle-specific deletion of Cox15 encoding a Cytochrome C Oxidase Assembly protein, leads to severe myopathy in mice (125). Meanwhile, rapamycin can improve this myopathy by activating TFEB-mediated lysosome biosynthesis and autophagic flux (126). A recent study found that human patients with MM and Deletor mice (127), a model of adult-onset MM with multiple mtDNA deletions, exhibited overtly abnormal mitophagy by activating mTORC1 (128).
Defects in CASA cause myofibrillar myopathies characterized by Z-band disorganization and rimmed vacuoles (2). Under physiological conditions, CASA targets unfold filamin C for timely autophagic degradation. If CASA is defective, misfolded filamin C and other Z-disc proteins accumulate and impair the integrity of the Z-disc, causing myofibrillar machinery dysfunction (2).
Muscle cells from patients with inclusion body myopathy (IBM) build up ubiquitin-positive rimmed vacuoles and non-digested autophagic vacuoles (129, 130). One of the causative genes for hereditary inclusion body myopathy (hIBM) is VCP encoding valosin-containing protein (VCP), whose mutation disrupts the maturation of ubiquitin-containing autophagosomes (130) and the dynamic tubular lysosomal network in fruit flies (131), thereby impairing autophagosome-lysosome fusion. Skeletal muscle-specific KO of Vcp in adult mice causes necrotic myopathy with accumulating macroautophagic/autophagic proteins, damaged lysosomes, and persistent activation of TEFB-mediated lysosome biosynthesis (132). The dominantly inherited mutations in SQSTM1 have been linked to rimmed vacuolar myopathy (RVM) by blocking the aggregated and ubiquitinated proteins to the autophagosome for degradation (133) or perturbing the stress granule dynamics (134). X-linked myopathy with excessive autophagy (XMEA), a childhood onset disease characterized by progressive vacuolation and weakness of skeletal muscle, is attributed to the decrease in Vacuolar ATPase Assembly Factor 21 (VMA21), essential for lysosomal degradative ability by assembling the vacuolar ATPase (135). Moreover, the muscle integrity is also fine-tuned by other autophagic modulators, such as muscle blind-like 1 (MBNL1) (136), myotonic dystrophy protein kinase (DMPK) (137), miR-7 (138), inositol polyphosphate 5-phosphatase (INPP5K) (139), ion protease homolog (LONP1) (140) and Sid1 transmembrane family member 2 (Sidt2) (141).
Targeting autophagy for skeletal muscle disease treatment
Given that defective autophagy contributes to many skeletal muscle diseases, reactivating autophagy may be beneficial in treating these diseases, as shown in Figure 4 and Table 2. Small molecules, gene therapies, and ASO therapies targeting autophagy have been under development for myopathies (142, 143). Rapamycin improves the pathological manifestations caused by LMNA mutations (144), ameliorates the pathology of mitochondrial myopathy (126, 128), and mitigates the myopathic phenotype of Cox15sm/sm mice (126). Urolithin A, a natural microflora-derived metabolite that activates mitophagy, improves muscle function in worm and mouse models of DMD (145), and in elderly persons (146). SW033291, specifically inhibiting 15-PGDH-mediated PGE2 signaling, rejuvenates aged muscle mass, strength and exercise capacity partly by increasing autophagy (98). Moreover, the beneficial effects are also observed in other intervention approaches targeting autophagy, like an autophagy agonist spermidine or low protein diet for MDC1A (147, 148), and AAV9-Apelin for sarcopenia (99).
Summary and perspective
In summary, autophagy plays an important role in the pathogenesis of heart and skeletal muscle diseases. The above-mentioned signaling pathways and molecules are far from being exhaustive, which reflects the rapid development of the field and the complexity of the molecular regulation of autophagy but provides a framework to address the potential analogies between cardiac and skeletal muscle diseases. Some regulatory pathways of autophagy are shared by both cardiac and skeletal myocytes. First, the core machinery of autophagy (such as mTORC1 and AMPK) and CASA commonly play crucial roles in both cardiac and skeletal muscles, suggesting that they may be common therapeutic targets for diseases affecting these two tissues (Figure 4). Second, many muscular dystrophies also exhibit cardiomyopathies (Tables 1, 3). Third, although Rab9-mediated alternative mitophagy has been only demonstrated in the involvement of heart diseases until now, it does not rule out the possibility that this signaling pathway may also be involved in skeletal muscle diseases. Understanding autophagy alterations underlying these diseases has accelerated the development of pharmacological and genetic interventions. The introduction of novel animal models, therapeutic strategies and state-of-the-art approaches for autophagy studies will provide further insights into the roles of autophagy in muscles and facilitate the drug development in the future.
Despite of many studies linking autophagy alterations to various striated muscle pathologies, most employed global or conditional KO animal models to examine autophagy in a snapshot way at certain timepoints. These strategies are limited in several aspects. First, certain autophagy alterations may be a compensatory effect in genetic animal models, as organisms have evolved into sophisticated regulatory mechanisms to safeguard against genetic or environmental insults. Second, autophagy-independent functions of some autophagy-related genes may contribute to the outcomes. Third, autophagy is a highly dynamic process whereas a snapshot of autophagy may not reflect the entire picture. Manipulating autophagy-related genes at the adult stage, pharmacological interventions with high specificity as well as autophagic dynamics analysis will address these limitations in the future.
Traditional and novel experimental approaches studying autophagy in other tissues and diseases can be used to study striated muscle disorders. For instance, single-cell RNA sequencing can determine which cell types contribute to diseases, and establish the link between autophagy and cell types. Specific targets against autophagy in certain cell types will be more beneficial to treatment. Multiomics techniques will provide a broader landscape of the impact of autophagy abnormalities in striated muscle disorders. DNA sequencing applied to human biopsies may determine the relationship between the mutations in autophagy-relevant genes and myopathies. Moreover, High-throughput screening strategies based on cutting-edge CRISPR or RNAi will identify the factors involved in autophagy under physiological or pathophysiological settings of striated muscles.
Some traditional interventions including caloric restriction and small chemicals are not specific and may provoke side effects. Encouragingly, gene therapy and ASO are increasingly being explored to treat autophagy defects in genetic heart and skeletal muscle disorders. Moreover, modulating autophagy via novel approaches such as mRNA delivery and gene editing may provide increased efficacy and specificity for treating striated muscle diseases. The drug exploration will be profoundly energized via the introduction of novel models such as humanized animal models and human iPSC-derived organoids. Moreover, artificial intelligence and protein structure prediction will boost rationally design of drugs targeting autophagy with higher specificity and efficacy.
Author contributions
HL primarily wrote the manuscript. All authors listed have made a substantial, direct, and intellectual contribution to the work, and approved it for publication.
Funding
RH was supported by U.S. National Institutes of Health grants (R01HL116546, R01HL159900, and R01AR070752), a Parent Project Muscular Dystrophy award, and Miao family gift. RH had received commercial research support from Stealth BioTherapeutics.
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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Keywords: autophagy, mitophagy, muscular dystrophy, cardiomyopathy, myopathy, gene therapy, heart disease, skeletal muscle disease
Citation: Li H, Zhang L, Zhang L and Han R (2022) Autophagy in striated muscle diseases. Front. Cardiovasc. Med. 9:1000067. doi: 10.3389/fcvm.2022.1000067
Received: 21 July 2022; Accepted: 27 September 2022;
Published: 13 October 2022.
Edited by:
Dongtak Jeong, Hanyang University, South KoreaReviewed by:
Adam P. Lightfoot, Liverpool John Moores University, United KingdomJiling Liang, Wuhan Sports University, China
Copyright © 2022 Li, Zhang, Zhang and Han. 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: Haiwen Li, aGFpd2VuLmxpQG9zdW1jLmVkdQ==; Renzhi Han, cmVuemhpLmhhbkBvc3VtYy5lZHU=