The effects of 5HT3 receptor antagonist granisetron on inflammatory parameters and angiogenesis in the air-pouch model of inflammation

International Immunopharmacology
Nasrin Maleki-DizajiAlireza Garjani

Abstract

The antagonists of 5HT(3) receptors have shown impressive efficacy in rheumatoid arthritis, osteoarthritis or fibromyalgia. The mechanistic relationships between 5HT(3) receptors, angiogenesis and sequence of cytokine expression, and leukocyte recruitment during inflammation are not clear. We evaluate the effects of granisetron on inflammatory parameters and angiogenesis in rat air-pouch model. Male Wistar rats were anesthetized, and then 20 ml and 10 ml of sterile air were injected subcutaneously in the back on day 0 and day 3, respectively. On day 6, inflammation was induced by injection of 1 ml of carrageenan 1% into pouches. After 6 and 72 h, the rats were sacrificed; pouch fluid was collected in order to determine exudate volume, the number of accumulated cells and TNFalpha/PGE(2) concentration. Pouches were dissected out and weighed. Angiogenesis of granulomatous tissue was assayed using a hemoglobin kit. Leukocyte accumulation was dose-dependently inhibited by granisetron both at 6 and 72 h after induction of inflammation. All doses of granisetron decreased hemoglobin level in the whole granulation tissue in a bell-shaped manner. Vascular network formation was also inhibited by granisetron. Granisetron increased PGE(2) l...Continue Reading

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