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Br J Pharmacol. 1994 Jun;112(2):347-8.

Dexamethasone-induced translocation of lipocortin (annexin) 1 to the cell membrane of U-937 cells.

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  • 1Department of Pharmacology, Immunobiology Research Institute Siena, Italy.

Abstract

Lipocortin (annexin) 1 is a putative mediator of the inflammatory effects of glucocorticoids. By flow cytometric analysis (FACS) we have studied the effect of dexamethasone on the cellular localization of lipocortin 1. U-937 cells were incubated with or without 10 nM phorbol 12-myristate 13-acetate (PMA) to induce cell differentiation. Then 1 microM dexamethasone was added and incubation carried out for increasing times (1-24 h). Dexamethasone caused a time-dependent biphasic translocation of lipocortin 1 from the intracellular compartment to the cell membrane with maximal membrane expression at 4 and 24 h. In differentiated U-937 cells the steroid-induced membrane accumulation of lipocortin 1 was significantly higher than that of undifferentiated cells. The accumulation of the protein in the cell membrane may precede its release which is stimulated by dexamethasone in differentiated U-937 cells. Since extracellular lipocortin 1 has anti-inflammatory properties the modulation of the translocation/secretion process of the protein by glucocorticoids may be part of their mechanism of action.

PMID:
8075850
[PubMed - indexed for MEDLINE]
PMCID:
PMC1910349
Free PMC Article
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