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An accessory role for ceramide in interleukin-1beta induced prostaglandin synthesis.

Abstract：

:Interleukin-1beta (IL-1) is a potent inducer of prostaglandin E2 (PGE2) synthesis. We previously showed that ceramide accumulates in fibroblasts treated with IL-1 and that it enhances IL-1-induced PGE2 production. The present study was undertaken to determine the mechanism(s) by which ceramide and IL-1 interact to enhance PGE2 production by examining their respective effects on the rate-limiting enzymes in PGE2 synthesis, cyclooxygenase-1 (COX-1), cyclooxygenase-2 (COX-2), and cytosolic phospholipase A2 (cPLA2). IL-1-induced PGE2 synthesis required approximately 8 h even though COX-1 was constitutively expressed (both mRNA and protein) and enzymatically active in untreated cells. Conversely, COX-2 mRNA was barely detectable in untreated cells but within 2 h, ceramide or IL-1 alone induced a 5 and 20 fold increase in COX-2 mRNA, respectively. However, IL-1 induced COX-2 protein synthesis was only detectable 6-7 h after maximal COX-2 mRNA induction; COX-2 protein accumulation was not induced by ceramide alone. Ceramide however, reduced the length of time required for IL-1 to induce COX-2 protein accumulation and increased COX-2 protein accumulation. IL-1 induced a 15 fold increase in COX-1 mRNA including an alternatively spliced form of COX-1. IL-1, but not ceramide induced cPLA2 mRNA and protein expression which corresponded with the initiation of PGE2 synthesis. These observations indicate that, (1) while either ceramide or IL-1 rapidly induced COX-2 mRNA, COX-2 protein only accumulated in IL-1 treated cells after a delay of 6-7 h, (2) IL-1-induced PGE2 synthesis required both COX-2 and cPLA2 protein synthesis and, (3) ceramide enhanced (temporally and quantitatively) IL-1-induced COX-2 protein

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Kirtikara K,Laulederkind SJ,Raghow R,Kanekura T,Ballou LR

doi

10.1023/a:1006824009546

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

41-8

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

181

pub_type

杂志文章

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