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Inhibition by corticosteroids of epidermal growth factor-induced recovery of cyclooxygenase after aspirin inactivation.

作者信息

Pash J M, Bailey J M

机构信息

Biochemistry Department, George Washington University School of Medicine and Health Sciences, Washington, DC 20037.

出版信息

FASEB J. 1988 Jul;2(10):2613-8. doi: 10.1096/fasebj.2.10.2968288.

DOI:10.1096/fasebj.2.10.2968288
PMID:2968288
Abstract

Cultures of vascular smooth muscle cells superfused with [14C]arachidonic acid synthesized the antiplatelet substance prostacyclin as the major cyclooxygenase product. Prostacyclin synthesis was inactivated by aspirin, which irreversibly acetylates cyclooxygenase. Aspirin-treated cells recovered within 2 h by a process that was blocked by cycloheximide but not by actinomycin D, and that required a serum component identified as epidermal growth factor (EGF). EGF-induced recovery of cyclooxygenase was greatly potentiated by type beta transforming growth factor (TGF-beta). Incubation with EGF and TGF-beta in the 0.1-1.0 nanomolar range stimulated cyclooxygenase recovery up to 20-fold without increasing [35S]methionine incorporation into other cell proteins. Induction of cyclooxygenase by EGF and TGF-beta also was prevented by cycloheximide but not by actinomycin D. EGF-dependent recovery was blocked by preincubation with dexamethasone (2 microM), an effect that was duplicated by pure lipocortin (2-4 micrograms/ml). Incubation of membrane preparations from these cells with EGF selectively activated phosphorylation of a 35-kDa cellular protein that comigrated with lipocortin. The results suggest that cyclooxygenase recovery in aspirin-inactivated vascular smooth muscle cells is mediated by an EGF-dependent translational control that is inhibited by corticosteroids. The findings also provide a new mechanism whereby corticosteroids suppress inflammatory prostaglandins.

摘要

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引用本文的文献

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