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PIKE GTPase signaling and function.

Jee-Yin Ahn1, Keqiang Ye

  • 1Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA.

International Journal of Biological Sciences
|June 14, 2005
PubMed
Summary

PIKE (PI 3-Kinase Enhancer) is a nuclear GTPase regulating PI 3-kinase activity. Its isoforms, PIKE-S, PIKE-L, and PIKE-A, have distinct roles in neuronal apoptosis and cancer cell invasion.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Neuroscience

Background:

  • PIKE (PI 3-Kinase Enhancer) is a brain-specific nuclear GTPase.
  • It enhances PI 3-kinase lipid kinase activity.
  • Nerve growth factor activates PIKE via phospholipase C-gamma1 (PLC-gamma1).

Purpose of the Study:

  • To characterize the different isoforms of PIKE.
  • To elucidate the roles of PIKE isoforms in cellular processes.
  • To understand PIKE's involvement in neuronal apoptosis and cancer.

Main Methods:

  • Isoform characterization (PIKE-S, PIKE-L, PIKE-A).
  • Analysis of subcellular localization (nuclear vs. cytoplasmic).
  • Investigation of protein-protein interactions (Homer 1, Akt).

Main Results:

  • PIKE-S is a shorter isoform, exclusively nuclear.
  • PIKE-L is a longer isoform, found in nucleus and cytoplasm, associating with Homer 1 to prevent neuronal apoptosis.
  • PIKE-A, found in various tissues, binds active Akt to promote cancer cell invasion and inhibit apoptosis.

Conclusions:

  • PIKE isoforms exhibit diverse cellular functions.
  • PIKE plays critical roles in both neuronal survival and cancer progression.
  • PIKE's functions extend from nuclear regulation to cytoplasmic signaling pathways.

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