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Am J Physiol Regul Integr Comp Physiol 263: R1235-R1240, 1992;
0363-6119/92 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 263, Issue 6 1235-R1240, Copyright © 1992 by American Physiological Society

ARTICLES

A critical role for central vasopressin in regulation of fever during bacterial infection

R. A. Cridland and N. W. Kasting
Department of Physiology, University of British Columbia, Vancouver, Canada.

Previous investigations on the antipyretic properties of arginine vasopressin have used bacterial endotoxins or pyrogens to induce fever. Because these experimental models of fever fail to mimic all aspects of the responses to infection, we felt it was important to examine the role of endogenously released vasopressin as a neuromodulator in febrile thermoregulation during infection. Therefore the present study examines the effects of chronic infusion of a V1-receptor antagonist or saline (via osmotic minipumps into the ventral septal area of the brain) on a fever induced by injection of live bacteria. Telemetry was used for continuous measurement of body temperature in the awake unhandled rat. Animals infused with the V1-antagonist exhibited fevers that were greater in duration compared with those of saline-infused animals. These results support the hypothesis that vasopressin functions as an antipyretic agent or fever-reducing agent in brain. Importantly, they suggest that endogenously released vasopressin may play a role as a neuromodulator in natural fever.


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