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Phospholipases and acyltransferases in macrophages.

I Flesch1, T Schonhardt, E Ferber

  • 1Max-Planck-Institut für Immunbiologie, Freiburg.

Klinische Wochenschrift
|February 1, 1989
PubMed
Summary

Protein kinase C activation in macrophages moves phospholipase A2 to membranes and inhibits arachidonic acid re-esterification. This dual action regulates free arachidonic acid levels for eicosanoid synthesis.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Immunology

Background:

  • Macrophages possess a unique acylchain-specific phospholipase A2 that releases arachidonic acid from phospholipids.
  • This enzyme is typically inactive in the cytosol of unstimulated macrophages.

Purpose of the Study:

  • To investigate the role of protein kinase C in regulating free arachidonic acid levels in macrophages.
  • To elucidate the mechanisms by which protein kinase C influences key enzymes involved in arachidonic acid metabolism.

Main Methods:

  • Activation of protein kinase C using diacylglycerols.
  • Assessing the translocation of cytosolic phospholipase A2 to cellular membranes.
  • Measuring the activity of acyl-CoA: lysophosphatide acyltransferase.

Main Results:

  • Protein kinase C activation leads to the translocation of phospholipase A2 to cellular membranes.
  • Diacylglycerols, activators of protein kinase C, inhibit acyl-CoA: lysophosphatide acyltransferase activity.
  • These opposing effects suggest a coordinated regulation of free arachidonic acid availability.

Conclusions:

  • Protein kinase C plays a critical role in modulating free arachidonic acid levels in macrophages.
  • The enzyme regulates arachidonic acid availability through opposing effects on phospholipase A2 and acyl-CoA: lysophosphatide acyltransferase.
  • This regulatory mechanism is crucial for controlling eicosanoid synthesis in macrophages.

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