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Related Experiment Videos

Dexamethasone effects on microvascular endothelial cell lipid composition.

M S Medow1, L Intrieri, T Moatter

  • 1Department of Pediatrics, New York Medical College, Valhalla 10595.

The American Journal of Physiology
|September 1, 1989
PubMed
Summary

Dexamethasone inhibits prostaglandin release in rabbit coronary microvessel endothelial cells by altering fatty acid composition, not by reducing arachidonic acid release. Alternate mechanisms for glucocorticoid action require further study.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Glucocorticoids, like dexamethasone, inhibit prostaglandin release in cultured rabbit coronary microvessel endothelial (RCME) cells.
  • This inhibition is dose-, time-, and glucocorticoid-dependent.

Purpose of the Study:

  • To investigate the effects of dexamethasone on RCME cell membrane lipid composition.
  • To examine the impact of dexamethasone on arachidonic acid release from RCME cells.

Main Methods:

  • Cultured RCME cells were treated with dexamethasone.
  • Analysis of RCME cell membrane phospholipid and fatty acid composition.
  • Measurement of A23187-stimulated arachidonic acid release.
  • Studies using radiolabeled arachidonic acid.

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Main Results:

  • Dexamethasone treatment did not significantly alter the relative distribution of membrane phospholipids.
  • Fatty acid composition changed, with an increase in saturated and monounsaturated fatty acids and a decrease in polyunsaturated fatty acids.
  • Dexamethasone inhibited prostaglandin release by 50% but did not reduce arachidonic acid release.
  • Data suggest dexamethasone may influence membrane remodeling.

Conclusions:

  • The inhibitory effect of glucocorticoids on prostaglandin release in RCME cells is not due to a general inhibition of arachidonic acid release.
  • Alternative mechanisms for glucocorticoid action on prostaglandin synthesis and release should be considered.