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Ballarino, M. Muscle Regeneration and RNA. Encyclopedia. Available online: https://encyclopedia.pub/entry/14732 (accessed on 19 April 2024).
Ballarino M. Muscle Regeneration and RNA. Encyclopedia. Available at: https://encyclopedia.pub/entry/14732. Accessed April 19, 2024.
Ballarino, Monica. "Muscle Regeneration and RNA" Encyclopedia, https://encyclopedia.pub/entry/14732 (accessed April 19, 2024).
Ballarino, M. (2021, September 29). Muscle Regeneration and RNA. In Encyclopedia. https://encyclopedia.pub/entry/14732
Ballarino, Monica. "Muscle Regeneration and RNA." Encyclopedia. Web. 29 September, 2021.
Muscle Regeneration and RNA
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This entry is adapted from the peer-reviewed paper 10.3390/cells10102512

In skeletal muscle, regeneration is driven by a reservoir of resident progenitors, called satellite cells, able to efficiently replenish damaged muscle [44]. These cells are not present in the adult cardiac muscle, although a regenerative response, mediated by the proliferation of pre-existing cardiomyocytes, occurs in mice during the first week of life [45,46,47]. Temporal and tissue-specific nuances in the process of regeneration may underlie the participation of still unknown protagonists, whose ability to fine-tune myogenic expression becomes critical in both physiological and pathological conditions. The peculiar properties of RNA, along with its tissue specificity, satisfy the requirements for its integration in regenerative networks and will surely pave the way for future applications in medicine.

noncoding RNAs (ncRNAs) long noncoding RNA miRNA circRNA modRNA RNA therapeutics myogenesis skeletal muscle regeneration cardiac regeneration clinical trials

1. Introduction

The existence of distinct roles for RNA was initially suggested by the discovery of messenger (mRNA) [1][2], ribosomal (rRNA) [3][4], and transfer (tRNA) [5] RNAs. Later on, several classes of relatively small non-coding (nc)RNAs were also identified, such as the small nuclear (snRNA) [6][7], small nucleolar (snoRNA) [8][9], micro (miRNA) [10], piwi-interacting (piRNA) [11], and small interfering (siRNA) [12][13] RNAs. Among them, miRNAs have attracted considerable attention because of their participation in almost every aspect of physiological [14][15] and pathological [16][17][18][19][20] processes.
In the last years, research on RNA was fostered by the emergence of the Next-Generation Sequencing (NGS) technologies, which offered the chance to deepen the analysis of multiple (cell and tissue) transcriptomic landscapes [21][22][23][24][25]. As reported in the latest Ensembl release [26], in humans, this yielded a number of ncRNAs significantly higher than the coding ones (23,982 versus 20,442) and mainly represented (~16,896) by long non-coding RNAs (lncRNA). LncRNA constitute the most recent and heterogeneous class of ncRNAs acting at transcriptional as well as at post-transcriptional levels through a variety of mechanisms [27][28][29]. A distinctive class of lncRNAs is constituted by the circular (circ)RNAs, whose covalently closed structure is key to their exceptional stability in the cellular environment [30][31]. As such, they have evolved conserved roles in multiple physiological processes and their involvement in pathology has deserved increasing consideration from the scientific community [32][33][34].

2. Applications of Small and Long RNAs as Therapeutic Tools for Muscle Regeneration

2.1. Small Non-Coding RNAs

2.1.1. microRNA (miRNA)

For therapeutic purposes, researchers can use small ncRNA-based drugs functioning as miRNA “mimics” (Figure 1A) or “inhibitors” (antagomiR) (Figure 1B). While “mimics” are designed to imitate [35], “antagomiRs” instead counteract endogenous miRNA activities [36]. These types of drugs have been applied to several diseases, such as blood cancer (antagomiR-155, Cobomarsen) [37], Alport’s nephropathy syndrome (antagomiR-21, Lademirsen) [38], and malignant pleural mesothelioma (mimic_miR-16, TargomiRs) [39] and also represent a prevailing revolution in the field of muscle regeneration, as demonstrated by their use in animal models (i.e., mice, rats, and pigs) [40].
Cells 10 02512 g002 550
Figure 1. RNA-based drugs in muscular and cardiovascular pathologies. (A) “Mimics” and siRNAs act by targeting specific mRNAs to inhibit their translation. Examples include the TQJ230 siRNAs, which specifically recognize and induce the degradation of ApoA mRNA in patients with pre-existing cardiovascular diseases [41]; (B) “AntagomiRs” act by sponging endogenous miRNAs, thus preventing their translational repression. MRG-110 was used to block miR-92a activity on pro-angiogenic genes to induce wound healing [42]; (C) ASO can be used to modify the splicing of precursor mRNAs (pre-mRNA). The exon-skipping strategy applied to dystrophin exon 51 is shown as an example. In DMD patients (-ASO), genetic mutations lead to the formation of a premature stop codon (STOP symbol) in the mature transcript that causes the lack of protein translation. The use of ASO base-pairing with dystrophin exon 51 (+ASO) promotes its exclusion from the mature mRNA and leads to the translation of a shorter (but functional) protein. For each targeted exon, the ASO approved by the FDA (Food and Drug Administration) are indicated [43][44][45][46][47]; (D) VEGF modRNA used in MI patients [48]. The uridine into pseudouridine substitution is represented by the greek Ψ symbol (red). Grey line: DNA; black line: RNA; red line: Therapeutic RNA.
In cardiac muscle, one of the challenges being tackled by researchers using these drugs was to re-establish heart functionality upon myocardial infarction (MI). In particular, different strategies have attempted to revert the necrotic death caused by MI-dependent hypoxia, either by increasing the proliferation of cardiomyocytes or by developing new blood vessels [49]. An example is represented by miR-199-a, a highly conserved miRNA shown to stimulate cardiac regeneration by promoting cell-cycle re-entry of adult rat cardiomyocytes [50]. Similarly, intramyocardial AAV6-injection of miR-199-a mimics in pigs, which underwent infarction by coronary artery occlusion, was found to stimulate cardiomyocytes proliferation [51]. The treatment also ameliorated the overall cardiac conditions by reducing the MI size and fibrosis and by improving the contractile functions. However, the inability to control the number of immature cardiomyocytes led to adverse effects, as 70% of the treated pigs died 7–8 weeks after injection [51]. Another example is miR-325-3p, of which administration in MI mice reduced the myocardiac damage through the repression of the necroptotic factor RIPK3 (Receptor Interacting Protein Kinase 3) [52][53].
In skeletal muscle, regeneration follows a very different path in respect to the heart due to the presence of satellite cells, the most representative muscle stem cells. Historically, satellite cells’ specification and self-renewal were ascribed to the activity of the paired-box Pax7 transcription factor [54][55][56]. The fact that, in mice, the regulation of Pax7 levels by miR-1/miR-206 influences the commitment of satellite cells from self-renewal to differentiation [56] paved the road for the use of miRNA-based drugs for the treatment of skeletal muscle diseases. In mice, miR-127 regulates the translation of S1PR3 (Sphingosine 1 Phosphate Receptor 3), a protein involved in the maintenance of satellite cells quiescence [57]. Mice engineered to overexpress miR-127 and subjected to skeletal muscle injury by cardiotoxin show increased satellite cells’ differentiation and accelerated regeneration. Interestingly, miR-127 overexpression also produced a beneficial effect in murine dystrophic muscles [58], which suggested potential applications for the treatment of muscular dystrophies. In the same year, Li and colleagues demonstrated the efficacy of miR-29b-based drugs in atrophy. In rodents, miR-29b is upregulated in multiple types of skeletal muscle atrophy models, which parallels with decreased levels of its direct targets, such as IGF-1 (Insulin-like growth factor 1) and PI3K (p85a) (Phosphatidylinositol 3-Kinase 85 KDa Regulatory Subunit Alpha), both involved in the mTOR signaling pathway [59][60]. MiR-29b inhibition through intramuscular antagomiRs injection was sufficient to attenuate atrophy and to increase the gastrocnemius-weight/body-weight ratio and myofibers diameter [61].

2.1.2. Single-Stranded Antisense Oligonucleotides (ASO)

ASO provided good performances in the treatment of several muscle pathologies [62]. They can be divided into two main categories: The DNA-based ASO, which induces target degradation through the recruitment of RNase H1 [63] and the RNA-based ASO, which alters mRNA processing [64] or translation [65][66] by a base-pairing block. In 2016 and 2017, respectively, the FDA (Food and Drug Administration) and EMA (European Medicine Agency) agencies approved Spinraza [67], the first RNA-based ASO found to be effective in the treatment of the spinal muscular atrophy (SMA) [68] (Table 1). In 2016, the FDA also approved Eteplirsen-ASO [69] for use in patients affected by Duchenne Muscular Dystrophy (DMD). This pathology is caused by several types of mutations of the dystrophin gene, which lead to the formation of premature stop-codons in dystrophin mRNA with the consequent loss of protein expression. Over the years, the use of ASO-based drugs able to convert the out-of-frame mutation to in-frame deletions to produce a shorter, but functional, dystrophin protein has been steadily increasing [70]. To date, the exons targeted by this strategy are represented by exon-51 (Eteplirsen, Drisapersen), exon-53 (Vitolarsen, Golodirsen), and exon-45 (Casimersen) (Figure 1C and Table 1) [43][44][45][46][47]. In particular, Eteplirsen is a 30-nucleotide phosphorodiamidate ASO that induces the skipping of dystrophin exon-51 by impeding the recognition of its splicing sites, thus preventing the formation of a premature stop codon [69]. Even though Eteplirsen was proven to be successful, the treatment can only be applied to ~14% of all DMD patients that present this specific type of mutation [71].
Table 1. RNA-based drugs and biomarkers for cardiac and skeletal pathologies.
Drug RNA Type Target Disease/Condition Company Phase Reference
MRG-110 Anti-miR miR-92a Wound Healing miRagen
(Viridian)		 Phase I NCT03603431
Spinraza
(Nusinersen)		 ASO SMN2 SMA Ionis FDA/EMA
approved		 NDA:209531
EMEA/H/C/004312
Eteplirsen
(Exondys 51)		 ASO Dystrophin DMD Sarepta
Inotersen		 FDA
approved		 NDA:206488
Drisapersen
(Kyndrisa)		 ASO Dystrophin DMD BioMarin Phase III NCT02636686
Vitolarsen
(Viltepso)		 ASO Dystrophin DMD Nippon Shinyaku FDA
approved		 NDA:212154
Golodirsen
(Vyondis 53)		 ASO Dystrophin DMD Sarepta
Therapeutics		 FDA
approved		 NDA:211970
Casimersen
(Amondys 45)		 ASO Dystrophin DMD Sarepta
Therapeutics		 FDA
approved		 NDA:213026
TQJ230 siRNA Apo(a) Cardiovascular Disease,
Elevated Lp(a)		 Novartis Phase III NCT04023552
AZD8601 mRNA VEGF Ischemic Heart Disease Moderna,
Astrazeneca		 Phase II NCT03370887
HEARTBiT miR Biomarker Heart Transplant
Rejection		     NCT03575910
CRUCIAL Circulating RNAs Biomarker Acute Heart Failure     NCT03345446
While no clinical trial is currently ongoing, promising ASO-based approaches are being applied in mice that model different muscle pathologies, such as centronuclear myopathies [72][73][74] and myotonic dystrophy type 1 (DM1). DM1 is a multisystemic disorder characterized by myotonia, progressive muscle wasting, cardiac conduction defects, and cognitive impairments [75]. It is caused by the abnormal expansion of CTG repeats in the 3′UTR of DMPK (dystrophia myotonica protein kinase) transcripts [76] that induces their nuclear retention [77] and sequestration of several RNA-binding proteins, which functional alteration leads to splicing errors [78]. Subcutaneous injection of ASO against DMPK in different DM1 mouse models has yielded positive results in reducing splicing errors, myotonia, and cardiac defects while increasing both skeletal muscle strength [79][80] and the number of satellite cells [81], thus facilitating the regeneration process.

2.1.3. Short-Interfering RNA (siRNA)

Other strategies that employ small RNAs are based on the use of small interfering RNAs (siRNAs), which exploit RISC to base-pair and degrade target mRNAs, thus impeding the production of the corresponding protein [82]. Along the years, the efficacy of these molecules has been tested in clinical trials for muscular as well as non-muscular diseases, ranging from polyneuropathy (Patisiran) [83] and chronic hepatitis B viral infection (1JNJ-3989) [84] to different types of cancer, such as pancreatic cancer (siG12D-LODER) [85] and hepatocellular carcinoma (TKM-080301) [86]. In cardiac muscle, these agents are currently being tested in patients with pre-existing cardiovascular diseases. For instance, the administration of TQJ230 siRNAs is shown to inhibit the production of the Apolipoprotein-a (ApoA) and reduce the inflammatory activity of circulating monocytes (Figure 1A and Table 1) [41][87].

2.2. Long-Sized RNAs

2.2.1. Protein-Coding RNAs

mRNA is the ideal instrument for treatments that require the expression of specific proteins. Over the years, this opportunity has inspired researchers to find new strategies for increasing its stability and minimizing immunogenicity through the modification of specific nucleosides. This culminated with the production of modRNAs, synthetic and chemically modified mRNAs originally applied in phase I and II clinical trials (https://clinicaltrials.gov accessed on 10 September 2021) to prevent virus infections, such as Coronavirus (NCT04470427), Zika virus (mRNA-1893, NCT04064905; NCT04917861), and Cytomegalovirus (mRNA-1647, NCT04232280), or in the treatment of solid tumors [88]. In cardiac muscle, modRNAs represent a chance for future MI treatments. As for miRNAs, modRNA-based recipes are thought to stimulate cardiomyocytes’ proliferation and increase the blood flow to the wounded area. For example, VEGF-A (Vascular Endothelial Growth Factor-A) is part of a large family of paracrine factors regulating angiogenesis, endothelial cells’ proliferation, and endothelial precursor cells’ differentiation [89]. First tested in cardiac-injured mice [90][91], pigs and monkeys [92], the direct delivery of VEGF-A modRNAs through epicardial injection yielded encouraging results in terms of survival, by increasing the density of capillaries surrounding the heart and by reducing apoptotic and scarred areas (Figure 1D and Table 1).

2.2.2. Non-Coding RNAs

Cytoplasmic ncRNAs

The functional participation of lncRNAs in muscle regeneration makes them promising targets for clinical applications. In particular, their ability to act as competing endogenous RNAs (ceRNA) attracted the scientific community and currently represents the most exploited way to dose the relative abundance of miRNAs and their targets in vivo (Figure 2A) [93][94][95]. Starting from 2011, several lncRNAs were shown to act in the cytoplasm of muscle cells as miRNA sponges [96]. One of the first studies led to the identification of linc-MD1, a lncRNA that governs the timing of skeletal muscle differentiation by sponging miR-133 and miR-135 [97]. Upon induction of myoblasts’ differentiation, linc-MD1 starts to be transcribed and inhibits miR-133 and miR-135 activities on their respective targets, MAML1 (Mastermind like transcriptional coactivator 1) and MEF2C (Myocyte enhancer factor 2C). Both proteins are important factors for the transcriptional regulation of pro-differentiating genes [98], thus the ncRNA-mediated regulation of their expression is essential for the correct induction of the latest stages of myogenesis.
Cells 10 02512 g003 550
Figure 2. Examples of lncRNA circuitries in muscle regeneration. (A) In the cytoplasm, lncRNAs and circRNAs can act as competing endogenous RNAs (ceRNA) to interfere with miRNA binding to their targets. Examples include CAREL/mir-296 [99], MIAT/miR-24 [100], LncMUMA/miR-762 [101], Lnc-Mg/miR-125b [102], CircHipk3/miR-133a [103], CircNfix/miR-214 [104], HRCR/miR-233 [105], and Circ-miR/miR-132/212 [106]. In the nucleus, lncRNAs can influence gene expression at the epigenetic level through several mechanisms [96]. Examples in the figure include (B) lncRNA decoys: LncMAAT impedes SOX6 binding on the promoter of miR-29b to repress its transcription [107], Linc-YY1 binds YY1 and blocks its interaction with the PRC2 complex [108]; (C) lncRNA guides: CPR [109] and Lnc-Rewind [110] respectively interact with the DNMT3A and G9a repressive complexes and guide them on specific promoters. Dashed grey lines represent the loss of interaction and regulation. TF = Transcription Factor. See text for further details.

Nuclear ncRNAs

The ability to act as sponges is mostly executed by cytoplasmic RNAs. Nuclear and chromatin enriched lncRNAs act as epigenetic rheostats of myogenesis through a variety of mechanisms [111][96]. Among the most recent examples, LncMAAT (Muscle-Atrophy-Associated Transcript) is a lncRNA that inhibits miR-29b transcription by impeding the binding of the transcription factor SOX6 to its promoter (Figure 3B). LncMAAT overexpression has been proposed as a possible strategy to treat muscle atrophy due to the significant attenuation of the pathological phenotypes (i.e. decreased weight of gastrocnemius muscles and grip strength and increased apoptosis) observed in AngII-induced atrophy mice [107]. Another example of a nuclear regulator is CPR (cardiomyocyte proliferation regulator), a lncRNA acting as a guide for the inhibitory DNMT3A (DNA methyltransferase 3 alpha) factor on the promoter of MCM3 (Minichromosome Maintenance Complex Component 3), whose expression is essential for genome replication and cell cycle progression (Figure 2C) [109][112]. In CPR knock-out mice, cardiomyocytes appear smaller than wild-type ones, although they are equipped with higher renewal capability. Indeed, upon MI, these mice show a higher percentage of proliferating cardiomyocytes accompanied by a clear improvement in cardiac functions, as compared to control animals [109]. Contrarily, the lncRNA Linc-YY1 acts as a decoy for YY1 (Yin-Yang 1) by blocking its interaction with the PRC2 complex, leading to the deregulation of several pro-differentiation genes (Figure 2B) [113]. Depletion of Linc-YY1 by siRNAs in satellite cells caused a significant decrease of MyoG and Pax7 positive cells. This result was also mirrored in vivo in cardiotoxin-induced mice in addition to a reduced number of newly formed myofibers [108]. A further example is Lnc-Rewind (Repressor of wnt induction), a chromatin-associated lncRNA previously identified by transcriptomic analysis [114] and recently shown to act as an epigenetic regulator of satellite cells proliferation and expansion [110]. Mechanistically, Lnc-Rewind directly interacts with the methyltransferase G9a to mediate the repression of its neighboring gene, Wnt7b, the expression of which is important for satellite cells’ differentiation (Figure 2C).

3. RNA as a Diagnostic Molecule for Muscle Diseases

Together with clinical treatment, the possibility to identify a pathological condition quickly and precociously is extremely important to prevent the worst outcomes. For this reason, studies aimed at the identification of specific RNA biomarkers for different diseases have been steadily growing in the latest years. Both coding and ncRNAs have been found in nearly all peripheral bodily fluids [115][116] and could help fill the void of reliable biomarkers.
In muscular diseases, the measurement of circulating biomarkers can lead to extremely rapid, non-invasive, and easy-to-perform diagnostic paths, which overcome the need for surgical biopsies. An increasing number of studies have demonstrated the validity of using circulating miRNAs as biomarkers for muscular disorders, such as DMD and DM1. For instance, the expression of miR-1, miR-206, and miR-133 myo-miRs was found to be high in the serum of DMD patients and strongly correlated to disease severity [117][118]. However, as their expression decline with age [119], probably due to the progressive loss of skeletal muscle mass, it is extremely hard to use them as markers in patients. Indeed, it is difficult to discriminate whether their levels are reduced during the pathology due to treatment or age. Another miRNA, miR-483-5p, has been added as a potential biomarker for DMD. Even though it has a lower predictive power in respect to myo-miRs, miR-483-5p expression levels are unchanged with age, thus offering an advantage in monitoring the progress of treated patients [120]. Together with myo-miRs, the pool that includes miR-27b, miR-140-3p, miR-454 and miR-574 can significantly discriminate DM1 patients from healthy controls if analyzed in combination or alone [121]. Their abundance in plasma correlates well with skeletal muscle strength and the levels of creatine kinase, which confirm the potential of miRNAs as biomarkers.

4. Conclusions and Perspectives

RNA shows incredible potential for both diagnosis and treatment of a vast number of diseases, including muscular and cardiovascular pathologies. The use of RNA-based drugs has several advantages, mainly (i) the quick and easy method of design, (ii) the high specificity in target recognition, mostly achieved by base-pairing, (iii) the possibility to target specific cell types or tissues, and (iv) their functional versatility. The usefulness and reliability of small ncRNAs-based drugs (i.e., miRNA, ASO, and siRNA) have already been recognized by the competent FDA and EMA institutions, which have given approval for their use in SMA and DMD. Long RNAs also represent appealing candidates for the development of innovative approaches. Chemical modifications to improve mRNA stability and prevent its immunogenicity have also allowed researchers to pursue their use for the treatment of several conditions. As of now, clinical trials that are being conducted to test the effect of modRNAs expression are still in Phase I or II; however, they already show promising results for future use in human patients. Among the non-coding species, lncRNA-based drugs could be exploited to directly target the nucleus, thus influencing the early stages of gene expression, such as gene transcription, epigenetic regulation, and RNA processing. Despite several studies demonstrating the feasibility of using these molecules for therapeutic purposes in animal models, their application in human patients is still far from being tested. Nevertheless, it is undeniable their potential to revolutionize, in the future, the approaches to therapeutic treatments.

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