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Related Experiment Videos

Caveolin-1 interacts with the insulin receptor and can differentially modulate insulin signaling in transfected Cos-7

F H Nystrom1, H Chen, L N Cong

  • 1Hypertension-Endocrine Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.

Molecular Endocrinology (Baltimore, Md.)
|December 22, 1999
PubMed
Summary
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Caveolin-1 interacts with the insulin receptor (IR) via its scaffolding domain, influencing insulin signaling differently in various cell types. This interaction enhances insulin action in Cos-7 cells but inhibits it in adipose cells.

Area of Science:

  • Cell biology
  • Molecular signaling
  • Endocrinology

Background:

  • Caveolae are specialized membrane microdomains involved in cellular signaling.
  • Caveolin-1 is a key structural protein of caveolae and plays a role in regulating receptor function.
  • The insulin receptor (IR) mediates insulin's metabolic and mitogenic effects.

Purpose of the Study:

  • To investigate the role of caveolin-1 in insulin receptor (IR) signaling.
  • To determine how caveolin-1 scaffolding domain interactions with the IR affect downstream signaling pathways.
  • To examine the cell-type-specific effects of caveolin-1 on insulin action.

Main Methods:

  • Overexpression of wild-type (Cav-WT) and mutant (Cav-Mut) caveolin-1 in Cos-7 and rat adipose cells.
  • Co-immunoprecipitation assays to assess caveolin-1 and IR interaction.

Related Experiment Videos

  • Analysis of IR autophosphorylation and downstream signaling pathway activation (e.g., Elk-1, ERK2 phosphorylation).
  • Assessment of GLUT4 translocation in response to insulin.

    • Main Results:

    • Caveolin-1's scaffolding domain is crucial for its interaction with the IR in intact cells.
    • Disruption of the caveolin-1 binding motif in the IR impairs its expression and autophosphorylation.
    • Overexpression of Cav-WT enhanced insulin-stimulated Elk-1 phosphorylation in Cos-7 cells, while Cav-Mut had no effect.
    • In adipose cells, both Cav-WT and Cav-Mut inhibited basal ERK2 phosphorylation and insulin-stimulated GLUT4 translocation.

    Conclusions:

    • Caveolin-1 interacts with the insulin receptor through its scaffolding domain.
    • This interaction differentially modulates insulin signaling pathways, enhancing insulin action in some cell types (Cos-7) and inhibiting it in others (adipose cells).
    • Caveolin-1's role in insulin signaling is context-dependent and cell-specific.