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Am J Physiol Regul Integr Comp Physiol 259: R266-R269, 1990;
0363-6119/90 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 259, Issue 2 266-R269, Copyright © 1990 by American Physiological Society

ARTICLES

Lipocortin 1 fragment modifies pyrogenic actions of cytokines in rats

F. Carey, R. Forder, M. D. Edge, A. R. Greene, M. A. Horan, P. J. Strijbos and N. J. Rothwell
Bioscience Department II, ICI Pharmaceuticals, Macclesfield, United Kingdom.

Lipocortins form a group of proteins that have been proposed as mediators of the anti-inflammatory actions of glucocorticoids. Intracerebroventricular injection of a recombinant fragment of lipocortin 1 (NH2-terminal 1-188) caused dose-dependent (0.4-1.2 micrograms) reductions in the acute increases in colonic temperature and oxygen consumption, which occurred in response to central injections of recombinant interleukin 1 beta and gamma-interferon in conscious rats. In contrast the lipocortin fragment did not affect the response to prostaglandin E2, and its activity was prevented by heat treatment or by pretreatment of animals with polyclonal antiserum raised to the fragment. Central injection of antiserum significantly enhanced the thermogenic responses to interleukin 1 beta in rats treated with dexamethasone without affecting the responses in normal animals. These results support a physiological role for lipocortin in the central effects of glucocorticoids.


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