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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Prostaglandin J(2) inhibition of mesangial cell iNOS expression.
Mesangial cells from MRL/lpr mice, a model of lupus, overproduce nitric oxide (NO) compared to controls. J series prostaglandins (PG) and thiazolidinediones block LPS stimulation of NO production via the activation of peroxisome proliferator-activator receptor-gamma (PPAR-gamma) in macrophages but utilize an alternative mechanism in microglial cells. We investigated the mechanism by which PGJ(2) inhibits NO production in LPS/IFN-gamma-stimulated MRL/lpr mesangial cells. Our results demonstrated that LPS/IFN-gamma addition to MRL/lpr mesangial cells stimulated iNOS activation, expression of p-38 kinase and p44/42 MAPK, and NF-kappaB translocation to the nucleus. Both pioglitazone, a specific PPAR-gamma agonist, and PGJ(2) blocked NO production, iNOS protein expression, and iNOS mRNA transcription. PGJ(2) failed to inhibit nuclear NF-kappaB translocation or p44/42 MAPK or p-38 kinase induction in stimulated mesangial cells. These data suggest that PGJ(2) blocks iNOS expression and subsequent NO production in mesangial cells via a PPAR-gamma-mediated mechanism either by interfering with NF-kappaB transcriptional activity or by an NF-kappaB-independent mechanism.
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