Sungkyunkwan University · Biochemistry, Genetics and Molecular Biology
Professor Jong-Sun Kang's research lab focuses on the molecular mechanisms regulating skeletal myogenesis, with a central emphasis on cell adhesion molecules and signaling pathways that govern myoblast differentiation and muscle development. The lab investigates the roles of Ig superfamily proteins such as CDO and BOC in mediating cell-cell contact-dependent signaling, their interactions with cadherins and cytoskeletal adaptors, and their regulation of key kinases like p38 MAPK and Abl. A major research direction involves understanding how these cell surface receptors coordinate with intracellular scaffolds to control cell cycle exit and differentiation during myogenesis, with implications for muscle regeneration and disease. The lab also explores the dynamic regulation of these molecules during embryonic development and in stem cell-like satellite cells.
Figures are computed from collected data and may differ slightly.
Anchorage-independent growth is a hallmark of transformed cells, but little is known of the molecular mechanisms that underlie this phenomenon. We describe here studies of cell cycle control of anchorage-independent growth induced by the ras oncogene, with the use of a somatic cell mutant fibroblast line (ER-1-2) that is specifically defective in oncogene-mediated, anchorage-independent growth. Control, nontransformed PKC3-F4 cells and ER-1-2 cells cannot proliferate in semisolid medium. Three i
CDO, a member of the Ig/fibronectin type III repeat subfamily of transmembrane proteins that includes the axon guidance receptor Robo, was identified by virtue of its down-regulation by the ras oncogene. We report here that one prominent site of cdo mRNA expression during murine embryogenesis is the early myogenic compartment (newly formed somites, dermomyotome and myotome). CDO is expressed in proliferating and differentiating C2C12 myoblasts and in myoblast lines derived by treating 10T1/2 fib
Genetic determinants of formation or repair of various muscles during different stages of myogenesis are unexpectedly diverse. Future studies should illuminate these differences, as well as mechanisms that underlie stem cell properties of satellite cells.
Cell adhesion molecules of the Ig superfamily are implicated in a wide variety of biological processes, including cell migration, axon guidance and fasciculation, and growth control and tumorigenesis. Expression of these proteins can be highly dynamic and cell type specific, but little is known of the signals that regulate such specificity. Reported here is the molecular cloning and characterization of rat CDO, a novel cell surface glycoprotein of the Ig superfamily that contains five Ig-like re
Determination and differentiation of cells in the skeletal muscle lineage is positively regulated by cell-cell contact. Cell-surface proteins proposed to mediate this effect include both classical cadherins and Ig superfamily members; potential interactions between the promyogenic activities of these classes of protein, however, are unknown. We show here that CDO and BOC, two promyogenic Ig superfamily members that bind to each other in a cis fashion, form complexes with N- and M-cadherin. These
The p38 mitogen-activated protein kinase (MAPK) pathway is required for differentiation of skeletal myoblasts, but how the pathway is activated during this process is not well understood. One mechanism involves the cell surface receptor Cdo (also known as Cdon), which binds to Bnip-2 and JLP, scaffold proteins for Cdc42 and p38, respectively; formation of these complexes results in Bnip-2/Cdc42-dependent activation of p38. It has been reported that the tyrosine kinase Abl promotes myogenic diffe
Cdon deficiency in satellite cells causes impaired proliferation of satellite cells and muscle regeneration via aberrant integrin and FGFR signalling.
Our findings demonstrate the effects of indoprofen in boosting skeletal muscle mass through the sequential activation of PDK1/AKT/S6K and AMPK/PGC-1α. Taken together, our results suggest that indoprofen represents a potential drug to prevent muscle wasting and weakness related to aging or muscle diseases.
p38MAPK plays an essential role in the transition of myoblasts to differentiated myotubes through the activation of MyoD family transcription factors. A promyogenic cell surface molecule, Cdo, promotes myogenic differentiation mainly through activation of the p38MAPK pathway. Two MAP3Ks, TAK1 and ASK1, can activate p38MAPK via MKK6 in various cell systems. Moreover TAK1 has been shown to promote myogenic differentiation via p38MAPK activation. In this study, we hypothesized that TAK1 and ASK1 mi
The mechanisms by which morphogens, such as Sonic hedgehog (Shh), specify distinct cell fates in a concentration-dependent manner are not fully understood. Shh signaling is regulated by a feedback network that comprises Shh-binding factors, the expression of which is controlled by the Hedgehog pathway itself. Recent studies have identified the hedgehog-binding protein growth arrest-specific gene 1 (Gas1) as a component of this network. Gas1 binds Shh to promote signaling, but its expression is s
Neuromuscular dysfunction is tightly associated with muscle wasting that occurs with age or due to degenerative diseases. However, the molecular mechanisms underlying neuromuscular dysfunction are currently unclear. Recent studies have proposed important roles of Protein arginine methyltransferase 1 (Prmt1) in muscle stem cell function and muscle maintenance. In the current study, we set out to determine the role of Prmt1 in neuromuscular function by generating mice with motor neuron-specific ab
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