Insulin-like growth factors (IGFs), IGF receptors, and IGF-binding proteins: Roles in skeletal muscle growth and differentiation

Cunming Duan, Hongxia Ren, Shan Gao

Research output: Contribution to journalReview article

264 Scopus citations

Abstract

The insulin-like growth factor (IGF) signaling pathway consists of multiple IGF ligands, IGF receptors, and IGF-binding proteins (IGFBPs). Studies in a variety of animal and cellular systems suggest that the IGF signaling pathway plays a key role in regulating skeletal muscle growth, differentiation, and in maintaining homeostasis of the adult muscle tissues. Intriguingly, IGFs stimulate both myoblast proliferation and differentiation, which are two mutually exclusive biological events during myogenesis. Both of these actions are mediated through the same IGF-1 receptor. Recent studies have shed new insights into the molecular mechanisms underlying these paradoxical actions of IGFs in muscle cells. In this article, we provide a brief review of our current understanding of the IGF signaling system and discuss recent findings on how local oxygen availability and IGFBPs act to specify IGF actions in muscle cells.

Original languageEnglish (US)
Pages (from-to)344-351
Number of pages8
JournalGeneral and Comparative Endocrinology
Volume167
Issue number3
DOIs
StatePublished - Jul 2010

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Keywords

  • Akt
  • HIF-1
  • Hypoxia
  • IGF
  • IGFBP
  • MAPK
  • MTOR
  • Myoblast
  • Proliferation

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Endocrinology

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