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Infection and Immunity, July 1999, p. 3488-3493, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Effect of Peroxisome Proliferator-Activated Receptor Alpha Activators on Tumor Necrosis Factor Expression in Mice during Endotoxemia

Molly R. Hill,1,2,* Stephen Clarke,3 Kerry Rodgers,2 Brandi Thornhill,2 Jeffrey M. Peters,4 Frank J. Gonzalez,4 and Jeffrey M. Gimble5,6,7

Departments of Radiologic Technology,1 Surgery,5 and Pathology,6 University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73190; Department of Zoology, University of Oklahoma, Norman, Oklahoma 730197; Department of Biological Sciences, Oklahoma Christian University, Oklahoma City, Oklahoma 731362; Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 208924; and Department of Nutritional Science, University of Wisconsin, Madison, Wisconsin 537063

Received 30 October 1998/Returned for modification 29 December 1998/Accepted 21 April 1999

Inflammatory mediators orchestrate the host immune and metabolic response to acute bacterial infections and mediate the events leading to septic shock. Tumor necrosis factor (TNF) has long been identified as one of the proximal mediators of endotoxin action. Recent studies have implicated peroxisome proliferator-activated receptor alpha (PPARalpha ) as a potential target to modulate regulation of the immune response. Since PPARalpha activators, which are hypolipidemic drugs, are being prescribed for a significant population of older patients, it is important to determine the impact of these drugs on the host response to acute inflammation. Therefore, we examined the role of PPARalpha activators on the regulation of TNF expression in a mouse model of endotoxemia. CD-1 mice treated with dietary fenofibrate or Wy-14,643 had fivefold-higher lipopolysaccharide (LPS)-induced TNF plasma levels than LPS-treated control-fed animals. Higher LPS-induced TNF levels in drug-fed animals were reflected physiologically in significantly lower glucose levels in plasma and a significantly lower 50% lethal dose than those in LPS-treated control-fed animals. Utilizing PPARalpha wild-type (WT) and knockout (KO) mice, we showed that the effect of fenofibrate on LPS-induced TNF expression was indeed mediated by PPARalpha . PPARalpha WT mice fed fenofibrate also had a fivefold increase in LPS-induced TNF levels in plasma compared to control-fed animals. However, LPS-induced TNF levels were significantly decreased and glucose levels in plasma were significantly increased in PPARalpha KO mice fed fenofibrate compared to those in control-fed animals. Data from peritoneal macrophage studies indicate that Wy-14,643 modestly decreased TNF expression in vitro. Similarly, overexpression of PPARalpha in 293T cells decreased activity of a human TNF promoter-luciferase construct. The results from these studies suggest that any anti-inflammatory activity of PPARalpha in vivo can be masked by other systemic effects of PPARalpha activators.

* Corresponding author. Mailing address: Department of Radiologic Technology, OUHSC, P.O. Box 26901, Oklahoma City, OK 73190. Phone: (405) 425-5459. Fax: (405) 425-5446. E-mail: Molly.Hill{at}oc.edu.

Infection and Immunity, July 1999, p. 3488-3493, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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