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The present study was designed to explore the anti-inflammatory effect of fluvoxamine, as a selective serotonin reuptake inhibitor (SSRI) anti-depressant, on carrageenan-induced paw edema in more details. At first, fluvoxamine was administered intra-peritoneally (2.5, 12.5, 25 and 50 mg Kg-1) 30 min before the subplantar injection of carrageenan. Fluvoxamine was also injected intra-peritoneally at a dose of 50 mg Kg-1 30 or 90 min after carrageenan injection. Then, fluvoxamine was given intra-cerebroventricularly (25, 50 and 100 μg/rat) and intra-thecally (25, 50 and 100 μg/rat) 30 min before the carrageenan challenge. Finally, the effect of mifepristone (5 mg Kg-1), an antagonist of the glucocorticoid receptor, on the anti-edema effect of fluvoxamine (50 mg Kg-1) was investigated. Results showed that intra-peritoneal (IP) administration of fluvoxamine before or after carrageenan injection considerably inhibited paw edema response at 4 h post-carrageenan (p < 0.001), but intra-cerebroventricular (i.c.v.) and intra-thecal (i.t.) injection of fluvoxamine did not alter the degree of paw swelling. The inhibitory effect of fluvoxamine was reduced by the pretreatment of mifepristone (p < 0.01). Our results suggest that IP administration of fluvoxamine produces a noticeable anti-inflammatory effect in the carrageenan-induced paw edema in rats and at least, a part of this effect is mediated through glucocorticoid receptor. Moreover, it seems unlikely that central sites have an important role in this inhibitory effect of fluvoxamine.

Effect of Fluvoxamine on Carrageenan-Induced Paw Edema in Rats Evaluation of the Action Sites