• Constitutive expression of Yap maintains Pax7 + and MyoD + satellite cells and satellite cell-derived myoblasts, promotes proliferation but prevents differentiation. (kcl.ac.uk)
  • Persistent expression of C/EBPβ upregulates Pax7, inhibits MyoD, and blocks myogenic differentiation. (biomedcentral.com)
  • All superior and inferior rectus muscles from both globes were examined for BrdU incorporation, MyoD expression, neonatal and developmental myosin heavy chain (MyHC) isoform expression, and myofiber cross-sectional area alterations. (arvojournals.org)
  • In the resected muscle and in the passively stretched antagonist muscle, there was a dramatic increase in the number of myofibers positive for neonatal MyHC and in the number of BrdU- and MyoD-positive satellite cells. (arvojournals.org)
  • Defective muscle regeneration can severely affect re-innervation by motor axons, and neuromuscular junctions (NMJs) development, ultimately leading to skeletal muscle atrophy. (biomed.news)
  • Significant loss of muscle mass may occur in cachexia and sarcopenia, which are major causes of mortality and disability. (mdpi.com)
  • Sarcopenia, the age-related loss of skeletal muscle mass and function, is becoming more prevalent as the lifespan continues to increase in most populations. (frontiersin.org)
  • Testosterone concentrations decline as age increase, suggesting that low plasma testosterone levels can cause or accelerate muscle- and age-related diseases, as sarcopenia. (frontiersin.org)
  • Currently, there is increasing interest on the anabolic properties of testosterone for therapeutic use in muscle diseases including sarcopenia. (frontiersin.org)
  • This age-related decline in skeletal muscle mass and strength generation, the primary function of skeletal muscle mass, is known as sarcopenia ( 2 , 3 ). (frontiersin.org)
  • Indeed, most of the intrinsic as well as extrinsic (systemic) muscle changes that occur with age are believed to be involved in the development of sarcopenia ( 5 , 6 ). (frontiersin.org)
  • The term sarcopenia was first proposed in 1989 by Irwin Rosenberg to describe a multifactorial syndrome that occurs with age and results in loss of skeletal muscle mass and function ( 3 , 4 ). (frontiersin.org)
  • However, during aging, extensive injury, or pathological conditions, the complete regenerative program is severely affected, with a progressive loss of muscle mass and function, a condition known as sarcopenia. (biomed.news)
  • Using genetic tools to conditionally abrogate C/EBPβ expression in Pax7 + cells, we examined the role of C/EBPβ in self-renewal of satellite cells during muscle regeneration. (biomedcentral.com)
  • After a single muscle injury, C/EBPβ-deficient satellite cells fail to self-renew resulting in a reduction of satellite cells available for future rounds of regeneration. (biomedcentral.com)
  • After a second round of injury, muscle regeneration is impaired in C/EBPβ conditional knockout mice compared to wild-type control mice. (biomedcentral.com)
  • These findings demonstrate that C/EBPβ is a novel regulator of satellite cell self-renewal during muscle regeneration acting at least in part through Notch2. (biomedcentral.com)
  • Further, C/EBPβ-deficient SCs are unable to self-renew after muscle injury leading to a reduction in the SC pool such that it cannot efficiently support muscle regeneration after a second round of injury. (biomedcentral.com)
  • 1 2 Residing outside the sarcolemma but within the basal lamina of individual myofibers is a population of cells that are responsible for muscle repair and regeneration, the satellite cells. (arvojournals.org)
  • 6 These manipulations result in satellite cell activation and proliferation, which in turn are responsible for muscle repair and regeneration. (arvojournals.org)
  • Skeletal muscle regeneration is regulated by coordinated activation of multiple signaling pathways. (elifesciences.org)
  • However, the role of individual arms of the UPR in skeletal muscle regeneration remain less understood. (elifesciences.org)
  • Myofiber-specific ablation of IRE1α or XBP1 in mice diminishes skeletal muscle regeneration that is accompanied with reduced number of satellite cells. (elifesciences.org)
  • Finally, targeted ablation of IRE1α also reduces Notch signaling, abundance of satellite cells, and skeletal muscle regeneration in the mdx mice, a model of Duchenne muscular dystrophy. (elifesciences.org)
  • Collectively, our experiments suggest that the IRE1α-mediated signaling promotes muscle regeneration through augmenting the proliferation of satellite cells in a cell non-autonomous manner. (elifesciences.org)
  • The findings shed new light on mechanisms of regeneration of healthy myofibers after severe tissue injury and suggest interplay between these fibers and muscle satellite cells though mechanisms remain to be elucidated. (elifesciences.org)
  • However, the mechanisms of muscle regeneration are not yet fully understood. (elifesciences.org)
  • In particular, in skeletal muscle, specific semaphorin molecules are involved in the restoration and remodeling of the nerve-muscle connections, thus emphasizing their plausible role to ensure the success of muscle regeneration. (biomed.news)
  • This review article aims to discuss the impact of aging on skeletal muscle regeneration and NMJs remodeling and will highlight the most recent insights about the role of semaphorins in this context. (biomed.news)
  • Cell culture experiments indicated that Gln could promote cell proliferation in a dose dependent manner, but expression of myogenesis regulatory genes was not altered. (nature.com)
  • MicroRNA-1/206(miRNA-1/206) is specifically expressed in skeletal muscle and play a critical role in myogenesis. (biomedcentral.com)
  • To understand the function of SFRP1 and miRNA-1/206 in swine myogenesis, we first predicted the targets of miRNA-1/206 with the TargetScan and PicTar programs, and analyzed the molecular characterization of the porcine SFRP1 gene. (biomedcentral.com)
  • Myofiber-specific ablation of IRE1α dampens Notch signaling and canonical NF-κB pathway in skeletal muscle of adult mice. (elifesciences.org)
  • The Wnt signaling pathway is involved in the control of cell proliferation and differentiation during skeletal muscle development. (biomedcentral.com)
  • We showed previously that cytoplasmic release of mtDNA activates the cGAS STING TBK1 pathway resulting in interferon-stimulated gene (ISG) expression that promotes antiviral immunity4. (regenerativemedicine.net)
  • Understanding the effects of strabismus surgery on muscle cell biological reactions and myofiber remodeling may suggest new approaches for improving surgical outcomes. (arvojournals.org)
  • There are a number of factors that initiate myofiber remodeling in adult skeletal muscles. (arvojournals.org)
  • Muscle samples were collected and myogenic cells were isolated and cultivated. (nature.com)
  • Overall, Gln supplementation stimulated cell proliferation in muscle tissue and in vitro in myogenic cell culture, whereas muscle growth regulatory genes were barely altered. (nature.com)
  • The delayed growth of LBW piglets is mainly due to a slower development of skeletal muscle as the myogenic activity is usually impaired in these animals during the fetal and early postnatal period 3 , 4 . (nature.com)
  • Therefore, we complemented our investigations into the cellular development of the skeletal muscle of neonatal piglets with in vitro studies using a primary porcine myogenic cell culture model with Gln supplementation. (nature.com)
  • The control of MuSC state depends on the expression levels of myogenic transcription factors. (biomed.news)
  • Quantifying the exact expression levels of the mRNA isoforms encoding these myogenic transcription factors is therefore key to understanding how MuSCs switch between cell states. (biomed.news)
  • We demonstrate that mdPCR can give exact molecule counts per cell for mRNA isoforms encoding the myogenic transcription factor Pax3. (biomed.news)
  • The PAX3 (paired box gene 3) gene encodes a member of the paired box or PAX family of transcription factors. (wikipedia.org)
  • Human PAX3 and mouse Pax3 are present in a subfamily along with the highly homologous human PAX7 and mouse Pax7 genes. (wikipedia.org)
  • The human PAX3 gene is located in the 2q36.1 chromosomal region, and contains 10 exons within a 100 kb region. (wikipedia.org)
  • In other mammalian species, including mouse, the longest mRNAs correspond to the human PAX3c and PAX3d isoforms, which consist of the first 8 or 9 exons of the PAX3 gene, respectively. (wikipedia.org)
  • PAX3 encodes a transcription factor with an N-terminal DNA binding domain consisting of a paired box (PD) encoded by exons 2, 3, and 4, and an octapeptide and complete homeodomain (HD) encoded by exons 5 and 6. (wikipedia.org)
  • In addition, the PAX3 protein has a C-terminal transcriptional activation domain encoded by exons 7 and 8. (wikipedia.org)
  • In the C-terminus of PAX3, there is a proline, serine and threonine (PST)-rich region measuring 78 amino acids that functions to stimulate transcriptional activity. (wikipedia.org)
  • PAX3 functions as a transcriptional activator for most target genes, but also may repress a smaller subset of target genes. (wikipedia.org)
  • A substantial number of PAX3 binding sites are located at larger distances upstream and downstream of target genes. (wikipedia.org)
  • Among the PAX3 target genes, there is one group associated with muscle development and a second group associated with neural and melanocyte development. (wikipedia.org)
  • PAX3 interacts with other nuclear proteins, which modulate PAX3 transcriptional activity. (wikipedia.org)
  • Dimerization of PAX3 with another PAX3 molecule or a PAX7 molecule enables binding to a palindromic HD binding site (TAATCAATTA). (wikipedia.org)
  • Interaction of PAX3 with other transcription factors (such as SOX10) or chromatin factors (such as PAX3/7BP) enables synergistic activation of PAX3 target genes. (wikipedia.org)
  • In contrast, binding of PAX3 to co-repressors, such as calmyrin, inhibits activation of PAX3 target genes. (wikipedia.org)
  • These co-repressors may function by altering chromatin structure at target genes, inhibiting PAX3 recognition of its DNA binding site or directly altering PAX3 transcriptional activity. (wikipedia.org)
  • Representative PAX3 transcriptional target genes. (wikipedia.org)
  • During development, one of the major lineages expressing Pax3 is the skeletal muscle lineage. (wikipedia.org)
  • Mitotically quiescent in mature muscle, they can be activated to proliferate and generate myoblasts to supply further myonuclei to hypertrophying or regenerating muscle fibres, or self-renew to maintain the resident stem cell pool. (kcl.ac.uk)
  • Finally, we confirm in myoblasts that Yap binds to Tead transcription factors and co-activates MCAT elements which are enriched in the proximal promoters of Yap-responsive genes. (kcl.ac.uk)
  • Postnatal growth and repair of skeletal muscle relies upon a population of quiescent muscle precursor cells, called satellite cells that can be activated to proliferate and differentiate into new myofibers, as well as self-renew to replenish the satellite cell population. (biomedcentral.com)
  • 10 Even more compelling is a recent study that subjected individual quiescent satellite cells isolated from adult limb muscle to stretching in vitro, and showed that direct stretching of the satellite cells themselves results in activation and bromodeoxyuridine (BrdU) incorporation. (arvojournals.org)
  • For example, muscle stem cells (MuSCs), located beneath the basal lamina, exist in the quiescent state but can transition to an activated, proliferative state upon injury. (biomed.news)
  • To assess the capacity of Pax7 to regulate transcription from these loci, we have cloned alternate transcripts of Pax7 (differing significantly in their DNA binding domain) into expression vectors and transfected cultured cells with these constructs, then analyzed target gene expression levels using RT-PCR. (edu.au)
  • CCAAT/enhancer binding proteins (C/EBPs) are a family of transcription factors that regulate cellular growth and differentiation, metabolism, and inflammation [ 18 ]. (biomedcentral.com)
  • More proliferation was observed in muscle tissue of LBW-GLN than LBW-ALA piglets at 5 dpn, but there was no clear effect of supplementation on related gene expression. (nature.com)
  • Glutamine is regarded as the most abundant amino acid in the body, is mainly synthesized in skeletal muscle 10 , and muscle tissue is the most important site for Gln storage 11 . (nature.com)
  • The balance between differentiation and self-renewal is critical to maintain muscle tissue homeostasis, and alterations in this equilibrium can lead to chronic muscle degeneration. (biomedcentral.com)
  • Skeletal muscle is a complex tissue composed of thousands of individual multinucleated myofibers. (arvojournals.org)
  • The use of a muscle creatine kinase germline knockout of the gene encoding Ire1/Ern1 shifts the focus from traditional studies of tissue repair toward the regenerating myofibers. (elifesciences.org)
  • Skeletal muscle, the most abundant tissue of the body, has remarkable regenerative capacity mainly due to its resident muscle stem cells, also known as satellite cells. (elifesciences.org)
  • The 'adipose tissue expandability model' identifies the limited capacity and dysfunctionality of WAT, preventing its expansion and accommodation of surplus of energy, as key determinants for the onset and progression of obesity-associated metabolopathologies as a result of ectopic deposition of toxic lipid species in metabolic organs (i.e. muscle or liver [also known as lipotoxic insult]) [ 7 ]. (springer.com)
  • Skeletal muscle is a target tissue for anabolic steroids. (frontiersin.org)
  • Thus, we have sought to identify genes targeted by Pax7 during embryonic development using an unbiased chromatin immunoprecipitation (ChIP) cloning assay to isolate cis-regulatory regions bound by Pax7 in vivo. (edu.au)
  • This analysis gives us greater insight into the direct functional role played by Pax7 during embryonic development. (edu.au)
  • The expression level of the SFRP1 was significantly higher in the embryonic skeletal compared with postnatal skeletal muscle, whereas miR-206 showed the inverse pattern of expression. (biomedcentral.com)
  • Feeding with amino acids can stimulate protein synthesis in all tissues, especially in skeletal muscle as reviewed by Davis et al. (nature.com)
  • The expression level of the SFRP1 was highly varied across numerous pig tissues and it was down-regulated during porcine skeletal muscle development. (biomedcentral.com)
  • Originally discovered as axon guidance factors, they have been implicated in cancer progression, embryonal organogenesis, skeletal muscle innervation, and other physiological and developmental functions in different tissues. (biomed.news)
  • Cell therapy with young bone marrow from green fluorescent protein (GFP) transgenic mice exhibited GFP+ myofibres in aged muscle tissues. (nagoya-u.ac.jp)
  • To further elucidate differentiation processes, more insight into gene regulatory networks is required. (keio.ac.jp)
  • The transcription factor CCAAT/enhancer binding protein beta (C/EBPβ) is expressed in Pax7 + satellite cells of healthy muscle and is downregulated during myoblast differentiation. (biomedcentral.com)
  • Here, we investigated the benefits and mechanisms of the preventive effects of YBMT on loss of muscle mass and function in a senescence-associated mouse prone 10 (SAMP10) model, with a special focus on the role of growth differentiation factor 11 (GDF-11). (nagoya-u.ac.jp)
  • This study also confirmed that age-related DNA methylation is associated to a certain extent with transcriptional modifications. (pasteur.fr)
  • The methylation is enabled by hgcA and hgcB genes, but it is not known if the associated molecular-level processes are rate-limiting or enable accurate prediction of MeHg formation in nature. (scilifelab.se)
  • Transcription is the process by which genes carried by DNA are encoded in another form (RNA), this RNA is then translated into proteins. (pasteur.fr)
  • In vaccine recipients, gene-level plasmablast and antibody responses were negligible and sera displayed moderate binding to recombinant orthopoxviral proteins (A29L, A35R, E8L, A30L, A27L, A33R, B18R, and L1R) and native proteins from the 2022 monkeypox outbreak strain. (bvsalud.org)
  • Findings: Gene-level plasmablast and antibody responses were negligible and JYNNEOS vaccinee sera displayed minimal binding to recombinant mpox proteins and native proteins from the 2022 outbreak strain. (bvsalud.org)
  • We demonstrate enrichment of RUNT family transcription-factor-binding motifs in human epidermal CD8+CD103+CD49a+ TRM cells, paralleled by high RUNX2 and RUNX3 protein expression. (scilifelab.se)
  • Here, we identify the transcriptional co-factor Yap as a novel regulator of satellite cell fate decisions. (kcl.ac.uk)
  • Both active and passive stretch of the rectus muscles produced by strabismus surgery dramatically upregulated the processes of satellite cell activation, integration of new myonuclei into existing myofibers, and concomitant upregulation of immature myosin heavy chain isoforms. (arvojournals.org)
  • Such lack of clarity can be attributed to difficulty in isolating the individual events responsible for alterations in skeletal muscle, most of which occur simultaneously, among the multiple age-associated changes and co-morbidities associated with advanced age. (frontiersin.org)
  • The addition of BrdU-positive myonuclei increased from 1 per 1000 myofibers in cross sections of control muscles to 2 to 3 per 100 myofibers in the resected muscles. (arvojournals.org)
  • It is considered postmitotic, in that the myonuclei residing within these myofibers do not divide in adult muscle. (arvojournals.org)
  • Consistent with the cellular phenotype, microarrays show that Yap increases expression of genes associated with Yap inhibition, the cell cycle, ribosome biogenesis and that it represses several genes associated with angiotensin signalling. (kcl.ac.uk)
  • This study elucidated effects of glutamine (Gln) supplementation on the cellular muscle development of LBW and normal birth weight (NBW) piglets. (nature.com)
  • We observed a temporarily increased intramuscular availability of free Gln that could have influenced cellular processes in skeletal muscle. (nature.com)
  • Studies targeted at establishing such effects at cellular level and their correlations with in vivo models, will broaden our understanding of the roles played by androgens on skeletal muscle function in elderly. (frontiersin.org)
  • In the present study, we demonstrate that IRE1α (also known as ERN1) and its downstream target, XBP1, are activated in skeletal muscle of mice upon injury. (elifesciences.org)
  • Methods: We examined the polyclonal serum (ELISA) and single B cell (heavy chain gene and transcriptome data) antibody repertoires and T cells (AIM and ICS assays) induced by the JYNNEOS vaccine as well as mpox infection. (bvsalud.org)
  • These findings increase understanding of the biological functions and the regulation of the SFRP1 gene in mammals. (biomedcentral.com)
  • Conclusions: These findings suggest that YBMT can prevent muscle wasting and dysfunction by mitigating apoptosis and proliferation via a modulation of GDF-11 signalling and mitochondrial dysfunction in SAMP10 mice. (nagoya-u.ac.jp)
  • Pax7 plays critical roles in development of brain, spinal cord, neural crest, and skeletal muscle. (edu.au)
  • Various growth factors, cytokines, and prostaglandins upregulate HGF gene expression, including basic fibroblast growth factor, oncostatin M, hypoxia-inducible factor 1α and nuclear factor-κB (NF-κB) ( 9 ). (spandidos-publications.com)
  • Sequencing and genomic localization of a library of chromatin-DNA fragments bound by Pax7 has identified 34 candidate Pax7 target genes, with occupancy of a selection confirmed with independent chromatin enrichment tests (ChIP-PCR). (edu.au)
  • We show that Pax7 directly occupies sites within genes encoding transcription factors Gbx1 and Eya4, the neurogenic cytokine receptor ciliary neurotrophic factor receptor, the neuronal potassium channel Kcnk2, and the signal transduction kinase Camk1d in vivo and regulates the transcriptional state of these genes in cultured cells. (edu.au)
  • Additionally, we've made progress in hepatocyte-targeted in vivo gene silencing by modifying the siRNAs. (genengnews.com)
  • Expression Levels of hgcAB Genes and Mercury Availability Jointly Explain Methylmercury Formation in Stratified Brackish Waters. (scilifelab.se)
  • Some binding sites are located in or near target genes, such as the 5' promoter, first intron and 3' untranslated region. (wikipedia.org)
  • As a sequence-specific DNA-binding transcription factor, any direct functional role played by Pax7 during development is mediated through target gene selection. (edu.au)
  • In the case of a GalNAc-conjugated siRNA targeting transthyretin (TTR), target gene silencing was achieved with an ED50 of approximately 5 mg/kg with a single subcutaneous injection. (genengnews.com)
  • These results represent a greater than 30-fold improvement in target gene silencing with siRNA conjugates as compared with first-generation siRNA conjugates previously described. (genengnews.com)
  • It reportedly delivers a greater than 30-fold improvement in target gene silencing. (genengnews.com)
  • Skeletal muscle is characterized by a remarkable capacity to rearrange after physiological changes and efficiently regenerate. (biomed.news)
  • Androgens are the main physiologic anabolic steroid hormones and normal testosterone levels are necessary for a range of developmental and biological processes, including maintenance of muscle mass. (frontiersin.org)
  • The miRNA-mRNA profiles and bioinformatics study suggested that the SFRP1 gene was potentially regulated by miRNA-1/206 during porcine skeletal muscle development. (biomedcentral.com)
  • By examining the transcriptome and epigenome of individual muscle stem cells simultaneously, we found that DNA transcribes* more chaotically in older muscle stem cells compared to those in younger mice. (pasteur.fr)
  • We examined the polyclonal serum (ELISA) and single B-cell (heavy chain gene and transcriptome data) antibody repertoires and T-cell responses (activation-induced marker and intracellular cytokine staining assays) induced by the JYNNEOS vaccine versus monkeypox virus infection. (bvsalud.org)
  • Irradiation treatment, which eliminates satellite cells from these muscles, prevents the compensatory hypertrophy in these types of experiments. (arvojournals.org)
  • Muscle stem cell from young mouse stained with the transcription factor Pax7 and in contact with the muscle fibre through the extracellular matrix protein M-Cadherin. (pasteur.fr)
  • For this reason, the team of Shahragim Tajbakhsh from Institut Pasteur, in collaboration with the team of Wolf Reik at the Babraham (UK) tried to decipher the relationships between epigenetic regulation of DNA and ageing muscle stem cells. (pasteur.fr)
  • This matrix protein is decreased in muscle stem cells in old mice thereby destabilising contact with the fibre. (pasteur.fr)
  • In stem cells in aged individuals, both transcriptional and epigenetic changes associated with ageing have been observed. (pasteur.fr)
  • Satellite cells are the resident stem cells of skeletal muscle. (kcl.ac.uk)
  • Proliferating, BrdU-positive cells in muscle sections were detected with immunohistochemistry indicating different cell types and decreasing proliferation with age. (nature.com)
  • In vitro stimulation of circulating CD8+CD45RA-CD62L+ T cells with IL-15 and TGF-β induced CD49a expression and cytotoxic transcriptional profiles in a RUNX2- and RUNX3-dependent manner. (scilifelab.se)
  • Another stimulus that activates satellite cells is stretching of the muscle. (arvojournals.org)
  • 7 8 9 In fact, passive stretching alone can activate limb muscle satellite cells. (arvojournals.org)
  • These cells are regulated by a tight control of transcriptional programs. (biomed.news)
  • Hepatocyte growth factor (HGF) is produced by stromal and mesenchymal cells, and it stimulates epithelial cell proliferation, motility, morphogenesis and angiogenesis in various organs via tyrosine phosphorylation of its cognate receptor, Met. (spandidos-publications.com)
  • HGF was cloned as a growth factor for hepatocytes ( 1 , 2 ), is identical to scatter factor (SF) and was originally discovered as a fibroblast-derived cell motility factor for epithelial cells ( 3 ). (spandidos-publications.com)
  • We also identify known regulators of satellite cell function such as BMP4, CD34 and Myf6 (Mrf4) as genes whose expression is dependent on Yap activity. (kcl.ac.uk)
  • In melanoma patients, high RUNX2, but not RUNX3, transcription correlated with a cytotoxic CD8+CD103+CD49a+ TRM cell signature and improved patient survival. (scilifelab.se)
  • 3 When a muscle is injured, this specialized cell population becomes activated, divides, and either repairs damaged fibers or forms new myofibers. (arvojournals.org)
  • Clinical studies of androgen supplementation in age-related diseases and muscle wasting are a focus of emerging interest ( 11 ). (frontiersin.org)
  • However, the pathophysiological mechanisms underlying this muscle syndrome and its relationship with plasma level of androgens are not completely understood. (frontiersin.org)
  • This presents a starting point for studies into the underlying mechanisms of AD including interactions with other AD-associated genes, like Rho1, Ankyrin, Tau and APP with the potential to identify new targets for treatment. (sdbonline.org)
  • Here, we find that persistent mtDNA stress is not associated with basally activated NF-κB signalling or interferon gene expression typical of an acute antiviral response. (regenerativemedicine.net)