Agonists for the peroxisome proliferator-activated receptor-alpha and the retinoid X receptor inhibit inflammatory responses of microglia.

Abstract:

:The peroxisome proliferator-activated receptor-alpha (PPAR-alpha) plays a key role in lipid metabolism and inflammation. Recently, we demonstrated that administration of the PPAR-alpha agonists gemfibrozil and fenofibrate, inhibit the clinical signs of experimental autoimmune encephalomyelitis (EAE), the animal model of multiple sclerosis (MS). In the present study we investigated the effects of PPAR-alpha agonists on primary mouse microglia, a cell type implicated in the pathology of MS and EAE. Our studies demonstrated that the PPAR-alpha agonists ciprofibrate, fenofibrate, gemfibrozil, and WY 14,643 each inhibited NO production by cytokine-stimulated microglia in a dose-dependent manner. However, fenofibrate and WY 14,643 were more potent inhibitors than gemfibrozil and ciprofibrate. In LPS-stimulated microglia, only fenofibrate and WY 14,643 significantly suppressed NO production. Additionally, PPAR-alpha agonists inhibited the secretion of the proinflammatory cytokines IL-1beta, TNF-alpha, IL-6, and IL-12 p40 and the chemokine MCP-1 by LPS-stimulated microglia. Retinoid X receptors (RXRs) physically interact with PPAR-alpha receptors, and the resulting heterodimers regulate the expression of PPAR-responsive genes. Interestingly, the RXR agonist 9-cis retinoic acid (9-cis RA) inhibited NO production by LPS-stimulated microglia. Furthermore, a combination of 9-cis RA and the PPAR-alpha agonist fenofibrate cooperatively inhibited NO production by these cells. A combination of these agonists also selectively inhibited the expression of proinflammatory cytokines including IL-1beta, TNF-alpha, and IL-6 by LPS-stimulated microglia. Collectively, these results raise the possibility that PPAR-alpha and RXR agonists might have benefit as a therapy in MS, where activated microglia are believed to contribute to disease pathology.

journal_name

J Neurosci Res

authors

Xu J,Storer PD,Chavis JA,Racke MK,Drew PD

doi

10.1002/jnr.20518

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

403-11

issue

3

eissn

0360-4012

issn

1097-4547

journal_volume

81

pub_type

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