UNSPECIFIED (2003) Evidence for post-transcriptional regulation of interleukin-5 by dexamethasone. IMMUNOLOGY, 109 (4). pp. 527-535. ISSN 0019-2805

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Abstract

Interleukin-5 (IL-5) is a T helper type 2 cytokine, which is implicated in the pathogenesis of eosinophilic diseases such as asthma. Both peripheral blood mononuclear cells (PBMC) and primary human T cells display similar patterns of IL-5 expression when stimulated with both phorbol-12-myristate 13-acetate and phytohaemagglutinin. The expression of IL-5 stimulated by these agents was shown to require de novo transcription and translation. However, although dexamethasone was a potent inhibitor of both IL-5 release and messenger RNA accumulation from PBMC and T cells, dexamethasone had no effect on the luciferase activity of a reporter construct under the control of an IL-5 promoter region transiently transfected into primary human T cells. Furthermore, dexamethasone appeared to decrease the stability of IL-5 messenger RNA and this effect was dependent upon de novo transcription. Taken together, the results presented here suggest that, whilst transcriptional processes predominantly regulate IL-5 release, the mechanism by which dexamethasone inhibits IL-5 is post-transcriptional.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology > QR180 Immunology
Journal or Publication Title:	IMMUNOLOGY
Publisher:	BLACKWELL PUBLISHING LTD
ISSN:	0019-2805
Date:	August 2003
Volume:	109
Number:	4
Number of Pages:	9
Page Range:	pp. 527-535
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9435

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