A series of new 2-(ethylthio)benzohydrazone derivatives (1–6) were prepared and characterised by IR, 1H NMR, and 13C NMR spectroscopy and mass spectrometry. The newly prepared compounds were screened for their in vitro antioxidant activities using free radical scavenging 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays. Among them, most powerful antioxidant, compound 1 has been selected in order to illustrate anti-ulcer effect on ethanol-induced gastric mucosal lesions in rats. Four groups of Sprague Dawley rats were respectively treated with 10% Tween 20 as ulcer control group, 20 mg/kg omeprazole as reference group, 50 mg/kg and 100 mg/kg compound 1 as experimental animals. Macroscopically, ulcer control group showed extensive hemorrhagic lesions of gastric mucosa compared with omeprazole or compound 1. Rats pre-treated with compound 1 showed increased in gastric pH and gastric mucus. Histologically, ulcer control group showed severe damage to gastric mucosa with edema and leucocytes infiltration of submucosal layer. In immunohistochemical analysis, rats which were pre-treated with compound 1 showed up-regulation of HSP70 and down-regulation of Bax proteins. In conclusion, the gastroprotective effect of compound 1 may be due to its antioxidant activity, and/or due to up-regulation of HSP70 and down-regulation of Bax protein in stained tissue section.
制备了一系列新的 2-(乙
硫基)苯甲酰基腙衍
生物 (1-6),并通过红外光谱、1H NMR 光谱、13C NMR 光谱和质谱进行了表征。利用自由基清除 2,2
-二苯基-1-苦基
肼(
DPPH)和
铁还原抗氧化能力(FRAP)测定法对新制备的化合物进行了体外抗氧化活性筛选。为了说明化合物 1 对
乙醇诱导的大鼠胃黏膜病变的抗溃疡作用,我们选择了其中抗氧化能力最强的化合物 1。四组 SpRAgue Dawley 大鼠分别接受 10% 吐温 20 作为溃疡对照组、20 毫克/千克
奥美拉唑作为参照组、50 毫克/千克和 100 毫克/千克化合物 1 作为实验组。与
奥美拉唑或化合物 1 相比,溃疡对照组大鼠的胃黏膜有广泛的出血病变。从组织学角度看,溃疡对照组的胃黏膜严重受损,黏膜下层出现
水肿和白细胞浸润。免疫组化分析显示,用化合物 1 预处理的大鼠表现出 HSP70 蛋白的上调和 Bax 蛋白的下调。总之,化合物 1 的胃保护作用可能是由于其抗氧化活性,和/或由于染色组织切片中 HSP70 蛋白的上调和 Bax 蛋白的下调。