{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies have established that ASB15, a member of the ankyrin repeat and SOCS box protein family predominantly expressed in skeletal muscle, plays an important role in regulating muscle growth. Overexpression of full‐length ASB15 in myoblasts was shown to delay differentiation initially, followed by a significant increase in protein synthesis that ultimately leads to enhanced muscle fiber growth in vivo. Mutational analyses further revealed that removal of specific functional domains of ASB15 either dysregulated protein degradation or led to abnormal differentiation, underscoring its dual role in governing both protein turnover and myoblast development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nIn parallel, investigations into the signal transduction pathways modulated by ASB15 have revealed its impact on the PI3K/Akt pathway during early muscle cell differentiation. Specifically, myoblasts overexpressing ASB15 exhibited reduced Akt phosphorylation, which correlated with delayed differentiation, whereas attenuation of ASB15 expression enhanced Akt activation and accelerated differentiation. Pharmacologic modulation using IGF-I and PI3K/Akt-specific inhibitors further supported these findings, suggesting that ASB15 exerts its regulatory effects on muscle cell differentiation predominantly via modulation of the PI3K/Akt axis, rather than via the Erk1/2 pathway."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nCollectively, the findings from these studies illuminate a critical role for ASB15 in muscle development, integrating the regulation of protein synthesis, degradation, and differentiation through distinct molecular pathways. By fine-tuning key signaling events such as those mediated by PI3K/Akt, ASB15 emerges as an important contributor to skeletal muscle growth, with potential implications for therapeutic strategies aimed at combating muscle wasting disorders."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}]}]}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "T G McDaneld, K Hannon, D E Moody "}, {"type": "b", "children": [{"type": "t", "text": "Ankyrin repeat and SOCS box protein 15 regulates protein synthesis in skeletal muscle."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Physiol Regul Integr Comp Physiol (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1152/ajpregu.00239.2005"}], "href": "https://doi.org/10.1152/ajpregu.00239.2005"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16424087"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16424087"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "T G McDaneld, D M Spurlock "}, {"type": "b", "children": [{"type": "t", "text": "Ankyrin repeat and suppressor of cytokine signaling (SOCS) box-containing protein (ASB) 15 alters differentiation of mouse C2C12 myoblasts and phosphorylation of mitogen-activated protein kinase and Akt."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Anim Sci (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.2527/jas.2008-1076"}], "href": "https://doi.org/10.2527/jas.2008-1076"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18641171"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18641171"}]}]}]}