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Phospholipase D2: functional interaction with caveolin in low-density membrane microdomains.

M Czarny1, G Fiucci, Y Lavie

  • 1Department of Biological Regulation, Weizmann Institute of Science, Rehovot, Israel.

FEBS Letters
|February 17, 2000
PubMed
Summary

This study identifies phospholipase D2 (PLD2) as the primary enzyme in caveolin-rich membranes. Caveolin-1 regulates PLD2 activity, impacting cellular processes.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Membrane Biology

Background:

  • Low-density detergent-insoluble membrane domains, known as caveolae, are enriched in caveolin-1.
  • These domains possess phospholipase D (PLD) activity, but the specific enzyme involved was previously unidentified and not PLD1.

Purpose of the Study:

  • To identify the specific phospholipase D enzyme present in caveolin-rich membrane domains.
  • To investigate the role of caveolin-1 in regulating PLD activity within these domains.

Main Methods:

  • Preparation of caveolin-rich fractions from HaCaT human keratinocytes using detergent-based and detergent-free methods.
  • Assay of PLD activity in caveolar fractions and immunoisolated PLD1 and PLD2.
  • Down-regulation of caveolin-1 expression using acetyl-leucyl-leucyl-norleucinal and sterol regulatory element-binding protein (SREBP).

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Main Results:

  • Caveolin-rich fractions contain phospholipase D2 (PLD2), not PLD1.
  • PLD activity in caveolar membranes is modulated by caveolin scaffolding domain peptides.
  • Down-regulation of caveolin-1 significantly reduces caveolar PLD activity.
  • Expression of SREBP also down-regulates caveolin-1 and decreases caveolar PLD activity.

Conclusions:

  • The phospholipase D activity in caveolin-rich membranes is identified as PLD2.
  • Caveolin-1 plays a regulatory role in vivo for PLD2 activity within caveolae.
  • These findings highlight a novel interaction between caveolin-1 and PLD2 in cellular signaling.