INFLUENCE OF GALLOPAMIL ON THE GASTRIC EFFECTS OF STRESS IN CONSCIOUSRATS

The influence of the calcium-channel blocker gallopamil on cold-restra int stress (CRS)-induced gastric effects was investigated in conscious rats with gastric cannula. CRS, while leading to multiple gastric les ions, reduced gastric acid output and mast cell count, but increased t he gastric emptying rate of acid solutions, Intraperitoneally injected gallopamil (1 mg/kg), given Ih before CRS administration, prevented g astric lesion formation and partially reversed mast cell count and the emptying of acid solutions, but had no further effect on acid output, However, gallopamil in unrestrained rats did not significantly affect acid emptying or mast cell count, Regarding calcium involvement in th e pathophysiology of stress-induced gastric lesions, the possible anti ulcer actions of gallopamil involved in the prevention of CRS-induced lesion formation may be attributed to its putative stabilizing effect on mast cells and gastric emptying.