Activated and inactivated PPARs-γ modulate experimentally induced colitis in rats.

Abstract:

BACKGROUND:This study sought to define the mechanism by which PPAR-γ ligands affect the course of experimentally induced colitis in rats. MATERIAL/METHODS:Inflammation was induced in Wistar rats by a single rectal administration of 2,4,6,-trinitrobenzene sulfonic acid (TNBS). The antagonist of PPARγ antagonist, bisphenol A diglycidyl ether (BADGE), was administrated intraperitoneally 120 mg/kg 4 times every other day. Rosiglitazone 8 mg/kg was administrated by gastric tube 4 times. Body weight was measured daily. After killing, the large intestinal tissue was weighed and collected for histopathologic and immunoenzymatic tests. Levels of IL-6, IL-10, and myeloperoxidase (MPO) were determined in serum and in intestinal homogenates. RESULTS:Rats receiving rosiglitazone had higher body weight, whereas large intestine weight/length ratio was lower; histology showed fewer inflammatory markers. Rats receiving TNBS and TNBS along with BADGE had more intensive inflammatory changes. Rosiglitazone alone decreased expression of IL-6; used with TNBS it decreased expression of MPO in intestinal tissue, yet did not increase the expression of IL-10. Decreased levels of MPO indicate reduced neutrophil-dependent immune response. The antagonist of PPAR-γ increased IL-6 in serum and decreased IL-10 in intestinal homogenates. Bisphenol A diglycidyl ether administrated to healthy animals increases serum IL-6 levels. CONCLUSIONS:Rosiglitazone inhibits experimental inflammation; administration of its selective antagonist abolishes this protective influence. Rosiglitazone inhibits expression of proinflammatory IL-6 and does not affect IL-10. Agonists of PPARs-γ are possibilities for inflammatory bowel disease prevention. Exogenous substances blocking PPARs-γ may contribute to development or relapse of nonspecific inflammatory bowel diseases.

journal_name

Med Sci Monit

authors

Celinski K,Dworzanski T,Korolczuk A,Slomka M,Radej S,Cichoz-Lach H,Madro A

doi

10.12659/msm.881712

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

BR116-24

issue

4

eissn

1234-1010

issn

1643-3750

pii

881712

journal_volume

17

pub_type

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