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• W2034452980 endingPage "8995" @default.
• W2034452980 startingPage "8983" @default.
• W2034452980 abstract "ABSTRACT Polypeptide growth factors activate specific transmembrane receptors, leading to the induction of multiple intracellular signal transduction pathways which control cell function and fate. Recent studies have shown that growth factors promote cell survival by stimulating the serine-threonine protein kinase Akt, which appears to function primarily as an antiapoptotic agent by inactivating death-promoting molecules. We previously established C2 muscle cell lines lacking endogenous expression of insulin-like growth factor II (IGF-II). These cells underwent apoptotic death in low-serum differentiation medium but could be maintained as viable myoblasts by IGF analogues that activated the IGF-I receptor or by unrelated growth factors such as platelet-derived growth factor BB (PDGF-BB). Here we show that IGF-I promotes muscle cell survival through Akt-mediated induction of the cyclin-dependent kinase inhibitor p21. Treatment of myoblasts with IGF-I or transfection with an inducible Akt maintained muscle cell survival and enhanced production of p21, and ectopic expression of p21 was able to sustain viability in the absence of growth factors. Blocking of p21 protein accumulation through a specific p21 antisense cDNA prevented survival regulated by IGF-I or Akt but did not block muscle cell viability mediated by PDGF-BB. Our results define Akt as an intermediate and p21 as a critical effector of an IGF-controlled myoblast survival pathway that is active during early myogenic differentiation and show that growth factors are able to maintain cell viability by inducing expression of pro-survival molecules." @default.
• W2034452980 created "2016-06-24" @default.
• W2034452980 creator A5085585096 @default.
• W2034452980 creator A5090842769 @default.
• W2034452980 date "2000-12-01" @default.
• W2034452980 modified "2023-10-16" @default.
• W2034452980 title "Insulin-Like Growth Factor-Mediated Muscle Cell Survival: Central Roles for Akt and Cyclin-Dependent Kinase Inhibitor p21" @default.
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• W2034452980 doi "https://doi.org/10.1128/mcb.20.23.8983-8995.2000" @default.
• W2034452980 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/86552" @default.
• W2034452980 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11073997" @default.
• W2034452980 hasPublicationYear "2000" @default.
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