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Am J Physiol Regul Integr Comp Physiol 273: R1998-R2004, 1997;
0363-6119/97 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 273, Issue 6 1998-R2004, Copyright © 1997 by American Physiological Society

ARTICLES

Evidence that brief stress may induce the acute phase response in rats

T. Deak, J. L. Meriwether, M. Fleshner, R. L. Spencer, A. Abouhamze, L. L. Moldawer, R. E. Grahn, L. R. Watkins and S. F. Maier
Department of Psychology, University of Colorado at Boulder 80309, USA.

Exposing rats to a single session of inescapable tail shock (IS) reduces corticosteroid binding globulin (CBG) 24 h later (Fleshner et al., Endocrinology 136: 5336-5342, 1995). The present experiments examined whether reductions in CBG are differentially affected by controllable vs. identical uncontrollable tail shock, are mediated by IS-induced glucocorticoid elevation, or reflect IS-induced activation of the acute phase response and whether IS produces fever. The results demonstrate that 1) equivalent reductions in CBG are observed in response to escapable tail shock or yoked IS, 2) IS-induced CBG reduction is not blocked by adrenalectomy in rats that receive basal corticosteroid replacement or by pretreatment with RU-38486, and 3) IS appears to activate the acute phase response, since IS reduces serum levels of an acute-phase negative reactant (CBG), increases serum levels of acute-phase positive reactants (haptoglobin and alpha 1-acid glycoprotein), and increases core body temperature 20-24 h later.


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