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IGF1 receptor signaling pathways.

Fumihiko Hakuno1, Shin-Ichiro Takahashi1

  • 1Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan.

Journal of Molecular Endocrinology
|March 15, 2018
PubMed
Summary
This summary is machine-generated.

Insulin-like growth factors (IGFs) activate cell surface receptors, initiating signaling cascades like PI3K and Ras-MAPK pathways. These pathways are crucial for IGF-mediated cell proliferation, differentiation, and survival.

Keywords:
MAP kinasePI 3-kinaseinsulin receptor substrate (IRS)insulin-like growth factor (IGF)insulin-like growth factor (IGF)-I receptorsignal transduction

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Area of Science:

  • Cell biology
  • Molecular signaling
  • Endocrinology

Background:

  • Insulin-like growth factors (IGFs) are key regulators of cellular processes.
  • IGFs exert their effects by binding to the IGF1 receptor (IGF1R) on the cell surface.
  • IGF1R activation initiates intracellular signaling cascades.

Purpose of the Study:

  • To review the established IGF1 receptor signaling pathways.
  • To discuss the bioactivities of IGFs mediated by these pathways.
  • To explore the modulation of IGF signaling by extracellular stimuli.

Main Methods:

  • Literature review of IGF1 receptor signaling.
  • Analysis of key signaling molecules and pathways (PI3K, Ras-MAPK).
  • Discussion of IGF-induced cellular responses.

Main Results:

  • IGF binding to IGF1R triggers receptor tyrosine kinase activity.
  • Activated IGF1R phosphorylates substrates like IRSs and SHC.
  • Downstream activation of PI3K and Ras-MAPK pathways mediates IGF bioactivities.

Conclusions:

  • IGF1 receptor signaling pathways are essential for IGF-mediated cell proliferation, differentiation, and survival.
  • Understanding these pathways is critical for deciphering IGF functions.
  • IGF signaling is subject to modulation by various cellular cues.