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Am J Physiol Regul Integr Comp Physiol 283: R862-R868, 2002. First published June 27, 2002; doi:10.1152/ajpregu.00200.2002
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Vol. 283, Issue 4, R862-R868, October 2002

A role for cyclooxygenase-2 in lipopolysaccharide-induced anorexia in rats

F. Lugarini1, B. J. Hrupka1, G. J. Schwartz2, C. R. Plata-Salaman3, and W. Langhans1

1 Institute of Animal Sciences, Physiology, and Animal Husbandry, Swiss Federal Institute of Technology, 8603 Schwerzenbach, Switzerland; 2 Department of Psychiatry, Weill Medical College of Cornell University, Bourne Lab, White Plains, New York 10463; and 3 Johnson & Johnson Pharmaceutical Research & Development, Spring House, Pennsylvania 19477

Because nonselective cycloooxygenase (COX) inhibition attenuated anorexia after lipopolysaccharide (LPS) administration, we tested the ability of resveratrol (2.5, 10, and 40 mg/kg) and NS-398 (2.5, 10, and 40 mg/kg), selective inhibitors of the two COX isoforms COX-1 and -2, respectively, to attenuate LPS (100 µg/kg ip)-induced anorexia. NS-398 (10 and 40 mg/kg) administered with LPS at lights out attenuated LPS-induced anorexia, whereas resveratrol at all doses tested did not. Because prostaglandin (PG) E2 is considered the major metabolite synthesized by COX, we measured plasma and cerebrospinal fluid (CSF) PGE2 levels after LPS administration. LPS induced a time-dependent increase of PGE2 in CSF but not in plasma. NS-398 (5, 10, and 40 mg/kg) blocked the LPS-induced increase in CSF PGE2, whereas resveratrol (10 mg/kg) did not. These results support a role of COX-2 in mediating the anorectic response to peripheral LPS and point at PGE2 as a potential neuromodulator involved in this response.

NS-398; resveratrol; prostaglandin E2; food intake; fever


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