Abstract

It is not certain whether chloroquine-induced pruritus is mainly attributable to the liberation of histamine, a powerful gastric acid secretagogue from mast cells, which may not be beneficial in peptic ulceration. Therefore, the aim of this study was to find out whether chloroquine (CQ) can stimulate gastric acid secretion in the rat. Gastric acid output was measured by the continuous perfusion of rats stomachs under anaesthesia with normal saline at the rate of 1ml per minutes. Thirty albino rats were divided into five groups of six rats each. Three groups had intraperitoneal administration of the following; normal saline (1ml/kg; control), CQ (3mg/kg; test) and Histamine H 2 receptor antagonist, Ranitidine (4mg/kg) following CQ administration respectively. The other two groups had subcutaneous administration of histamine (100mg/kg) alone and histamine following CQ administration respectively. The basal acid secretion, (4.71± 0.05μmol/10mins) in a group of rats was not significantly increased in comparison with the peak acid output (p>0.05) following normal saline administration (1ml/kg; i.p.). Administration of CQ in a second group significantly increased acid secretion to a peak of 7.2 ± 1.7μmol/10mins (p 2 -receptors in rats. Nigerian Journal of Physiological Sciences Vol. 20(1&2) 2005: 69-73

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