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The death effector domain of PEA-15 is involved in its regulation of integrin activation

J W Ramos1, T K Kojima, P E Hughes

  • 1Department of Vascular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.

The Journal of Biological Chemistry
|December 16, 1998
PubMed

Insights

PEA-15 protein reverses Ras-initiated suppression of integrin activation by blocking a distinct R-Ras pathway. This finding reveals a novel role for death effector domains (DEDs) in regulating cell adhesion, not just apoptosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrin activation, crucial for cell adhesion, is modulated by intracellular signaling.
  • Ras-mediated mitogen-activated protein kinase pathways typically suppress integrin activation in fibroblasts.

Purpose of the Study:

  • To identify cDNAs that counteract Ras-induced suppression of integrin activation.
  • To elucidate the mechanism by which PEA-15 protein regulates integrin activation.

Main Methods:

  • Expression cloning to isolate functional cDNAs.
  • Investigating the effects of PEA-15 on Ras/ERK signaling.
  • Utilizing dominant-negative R-Ras to probe signaling pathways.

Main Results:

  • PEA-15 was identified as a protein that prevents Ras suppression of integrin activation.
  • PEA-15 inhibits Ras suppression through a pathway involving R-Ras, distinct from ERK activation.
  • The death effector domain (DED) of PEA-15 is critical for its function in regulating integrin activation.

Conclusions:

  • PEA-15 reverses Ras-mediated suppression of integrin activation.
  • The DED of PEA-15 plays a non-apoptotic role in regulating integrin function.
  • Certain DED-containing proteins can regulate cell adhesion processes beyond apoptosis.

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