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Related Experiment Videos

Grb10: more than a simple adaptor protein.

Mei A Lim1, Heimo Riedel, Feng Liu

  • 1Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, USA.

Frontiers in Bioscience : a Journal and Virtual Library
|February 10, 2004
PubMed
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Growth factor receptor-bound protein 10 (Grb10) is an adaptor protein regulating insulin and IGF-I signaling. Its role in development and metabolic functions is crucial, with implications for growth disorders like Silver-Russell syndrome.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Developmental Biology

Background:

  • Grb10 is an adaptor protein belonging to a superfamily including Grb7 and Grb14.
  • It possesses conserved domains: N-terminal proline-rich motif, Pleckstrin homology (PH) domain, Src homology 2 (SH2) domain, and a BPS region.
  • Grb10 interacts with receptor tyrosine kinases like insulin receptor (IR) and insulin-like growth factor-I receptor (IGF-IR).

Purpose of the Study:

  • To investigate the role of Grb10 in regulating insulin/IGF-I signaling pathways.
  • To explore Grb10's involvement in embryonic development and its link to growth disorders.
  • To understand Grb10's function in the central nervous system and metabolic regulation.

Main Methods:

  • Analysis of Grb10 interactions with receptor tyrosine kinases (IR, IGF-IR) and non-receptor tyrosine kinases (Tec, Bcr-Abl).

Related Experiment Videos

  • Investigating the effects of Grb10 overexpression on insulin/IGF-I signaling.
  • Studying the consequences of Grb10 gene disruption in mouse models to assess its role in growth.

    • Main Results:

    • Grb10 binds to the insulin receptor via its SH2 and BPS domains.
    • Grb10's effect on insulin/IGF-I signaling is context-dependent, varying with isoform expression and cell type.
    • Disruption of the Grb10 gene in mice leads to overgrowth, suggesting a role as a growth inhibitor during development.

    Conclusions:

    • Grb10 plays a significant role in regulating insulin/IGF-I signaling during embryogenesis and development.
    • Genetic imprinting of Grb10 is linked to Silver-Russell syndrome, a growth deficiency disorder.
    • Grb10's expression in the central nervous system suggests a role in neuronal insulin signaling and metabolism.