Gastroprotective effect of sumatriptan against indomethacin‐, stress‐ and ethanol‐induced gastric damage in male rats: Possible modulatory role of 5‐hydroxytryptamine 1B/1D receptors and pro‐inflammatory cytokines.

The current study was aimed to investigate the beneficial effect of sumatriptan, a 5‐hydroxytryptamine 1B/1D (5HT1B/1D) receptor agonist, on gastric ulcer in rats via stimulating 5HT1B/1D receptors and suppressing pro‐inflammatory cytokines. Rats were allocated into three models of gastric ulcer: indomethacin (30 mg/kg, PO), water immersion restraint stress (WRS) and ethanol (5 ml/kg PO). Animals were administered with sumatriptan (0.01, 0.1, 0.3 and 1 mg/kg, i.p) 30 min before gastric ulcer induction. GR‐127935 (0.01 mg/kg, i.p, a selective 5HT1B/1D antagonist) was administered 30 min before sumatriptan (0.1 mg/kg) injection. Macroscopic assessments (J‐score), ELISA analysis of tumour necrosis factor‐alpha (TNF‐α) and interleukin‐1beta (IL‐1β) and histopathological changes were performed on the rat's stomach tissues. Gastric ulcer induction in three models caused an increase in J‐score, TNF‐α, IL‐1β and microscopic features. Sumatriptan (0.1 mg/kg) significantly improved gastric injury induced by indomethacin, WRS and ethanol through the reduction in the J‐score, TNF‐α, IL‐1β and microscopic lesions. Concurrent administration of GR‐127935 (0.01 mg/kg) with sumatriptan (0.1 mg/kg) reversed the gastroprotective effect of sumatriptan in three models. Sumatriptan possessed gastroprotective effects on indomethacin‐, WRS‐ and ethanol‐induced gastric damage in rats via the possible involvement of the 5HT1B/1D receptors. [ABSTRACT FROM AUTHOR]