title: Potentiation of indomethacin-induced anti-inflammatory response by pioglitazone in carrageenan-induced acute inflammation in rats: Role of PPARγ receptors.
abstract: This study aimed to assess the interaction between anti-inflammatory effects of pioglitazone (peroxysome proliferator activated receptor-gamma (PPARγ) agonist, PGL), and indomethacin (cyclooxygenase (COX) inhibitor, IND) and to evaluate the possible underlying mechanisms. Paw edema induced by carrageenan was used to induce inflammation. Different doses of IND (0.3-10mg/kg) and PGL (1-20mg/kg) alone or in combination were administered intraperitoneally to rats. Paw tissue levels of PPARγ, COX-2, and prostaglandin E2 and serum levels of TNF-α and IL-10 were also estimated. Doses of IND and PGL showed a statistically significant anti-inflammatory effect. Combination of a non-effective dose of IND (0.3mg/kg) with increasing doses of PGL (1-10mg/kg) resulted in potentiated anti-inflammation and vise versa. IND, PGL and the combination were able to reduce the COX-2, PGE2 contents and TNF-α level. Moreover, all these treatments caused elevation in PPARγ levels and IL-10 levels. However, when the rats were pre-treated with GW-9662 (a selective PPARγ antagonist), all the anti-inflammation and alterations in the biochemical factors were antagonized. These results showed that PGL markedly enhanced the anti-inflammatory activity of IND and this effect mediated partly at least, through PPARγ. Possible mechanisms of the interaction were that PGL stimulates the PPARγ and inhibits COX-2 by those cytokines that trigger the PPARγ and also inhibit COX-2. This study suggests that combination therapy with pioglitazone and indomethacin may provide an alternative for the clinical control of inflammation especially in patients with diabetes.
authors.affiliation: Dept. of Pharmacology, School of Pharmacy, Ahvaz Jundishapur University of Medical Sciences (AJUMS), Ahvaz, Iran.
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Houshmand
authors.affiliation: Dept. of Pharmacology, School of Medicine, Physiology Research Center, Ahvaz Jundishapur University of Medical Sciences (AJUMS), Ahvaz, Iran. Electronic address: mansouri_smt@yahoo.com.
authors.forename: Mohammad Taghi
authors.initials: MT
authors.lastname: Mansouri
authors.affiliation: Dept. of Pharmacology, School of Medicine, Physiology Research Center, Ahvaz Jundishapur University of Medical Sciences (AJUMS), Ahvaz, Iran.
authors.forename: Bahareh
authors.initials: B
authors.lastname: Naghizadeh
authors.affiliation: Dept. of Pharmacology, School of Pharmacy, Ahvaz Jundishapur University of Medical Sciences (AJUMS), Ahvaz, Iran.
authors.forename: Ali Asghar
authors.initials: AA
authors.lastname: Hemmati
authors.affiliation: Dept. of Anatomical Sciences, School of Medicine, Ahvaz Jundishapur University of Medical Sciences (AJUMS), Ahvaz, Iran.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Hashemitabar
mesh_terms: D000818:Animals; D000893:Anti-Inflammatory Agents / Q000627:therapeutic use*; D002351:Carrageenan; D016861:Cyclooxygenase Inhibitors / Q000627:therapeutic use*; D015232:Dinoprostone / Q000378:metabolism; D004357:Drug Synergism; D004359:Drug Therapy, Combination; D004487:Edema / Q000139:chemically induced / Q000188:drug therapy*; D007213:Indomethacin / Q000627:therapeutic use*; D007249:Inflammation / Q000139:chemically induced / Q000188:drug therapy*; D016753:Interleukin-10 / Q000378:metabolism; D008297:Male; D047495:PPAR gamma / Q000819:agonists / Q000378:metabolism*; D000077205:Pioglitazone; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D045162:Thiazolidinediones / Q000627:therapeutic use*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D000893:Anti-Inflammatory Agents; D016861:Cyclooxygenase Inhibitors; D047495:PPAR gamma; C000613696:PPAR gamma, rat; D045162:Thiazolidinediones; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D002351:Carrageenan; D011451:Prostaglandin-Endoperoxide Synthases; D015232:Dinoprostone; D000077205:Pioglitazone; D007213:Indomethacin
keywords: Carrageenan; IL-10; Indomethacin; Inflammation; PPARγ receptor; Pioglitazone; TNF-α