ArticleOncogene2002
Insulin restores differentiation of Ras-transformed C2C12 myoblasts by inducing NF-kappaB through an AKT/P70S6K/p38-MAPK pathway.
Article in Oncogene, 2002. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.
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Who cites it
30 citing papers in PubMed, 66 citations in OpenAlex.
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- Silencing PDK1 limits hypoxia-induced pulmonary arterial hypertension in mice via the Akt/p70S6K signaling pathway.Experimental and therapeutic medicine · 2019Article
- Continuous exposure of isoprenaline inhibits myoblast differentiation and fusion through PKA/ERK1/2-FOXO1 signaling pathway.Stem cell research & therapy · 2019Article
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- HuR and miR-1192 regulate myogenesis by modulating the translation of HMGB1 mRNA.Nature communications · 2013Article
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- Article
- Hypoxia converts the myogenic action of insulin-like growth factors into mitogenic action by differentially regulating multiple signaling pathways.Proceedings of the National Academy of Sciences of the United States of America · 2010Article
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Corrections and comments
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Authors and funding
5 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
v-H-ras transformed C2C12 (C2Ras) myoblasts, overexpressing p21-Ras protein in the Ras-GTP active form, showed a differentiation-defective phenotype when cultured in low serum as compared with C2C12 myoblasts. Accordingly, the purpose of the present study was to delineate the signaling pathways that restore C2Ras myoblasts differentiation. Inhibition of p42/p44-MAPK with the chemical inhibitor PD98059, and activation of AKT/P70S6K and p38-MAPK with insulin, produced growth arrest (precluding the expression of PCNA, cyclin-D1 and retinoblastoma at the hyperphosphorylated state and inducing the expression of the cell cycle inhibitor p21(Cip)) and myogenesis (multinucleated myotubes formation and induction of creatine kinase, caveolin-3 and alpha-actin). Both events were accompanied by down-regulation of AP-1 and up-regulation of NF-kappaB transcriptional activities. Furthermore, inhibition of NF-kappaB transcriptional activity by the use of the proteasome inhibitor MG132 totally precluded differentiation by insulin+PD98059, demonstrating a direct role for NF-kappaB on C2Ras myogenesis. C2Ras myoblasts failed to restore differentiation when rapamycin or PD169316 were added in the presence of insulin+PD98059, indicating that the activation of both P70S6K and p38-MAPK was necessary to reach a fully differentiated phenotype. Finally, transient transfection of a constitutively active Myr-EGFP-AKT-HA construct (in the presence of PD98059) restored C2Ras myogenesis by its ability to activate P70S6K and p38-MAPK. A crosstalk between P70S6K and p38-MAPK was observed under rapamycin treatment in both insulin or active AKT induced myogenesis. Our results are delineating an AKT/P70S6K/p38-MAPK pathway involved in skeletal muscle differentiation.
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