L精氨酸预防大鼠应激性溃疡的机制研究
应激性溃疡,,L精氨酸;,应激性溃疡;一氧化氮;胃粘膜血流量,1材料和方法,2结果,3讨论,参考文献:
摘要:目的 探讨一氧化氮(NO)在大鼠应激性溃疡(SU)中的作用及L精氨酸的预防机制。方法 采用冷束缚法制备大鼠应激性溃疡模型, 中性红清除率法测定大鼠胃粘膜血流量。 观察预先给予L精氨酸、LNAME(硝基精氨酸甲酯,处理后大鼠胃粘膜血流量(GMBF)、溃疡指数(UI)、溃疡坏死组织和中性粒细胞浸润严重程度的变化,同时测定胃粘膜和血浆NO 含量的变化。结果 与正常对照组相比模型损伤组的UI、胃粘膜和血浆NO 明显增加,溃疡底部坏死物质和周围组织中中性粒细胞浸润均明显加重,GMBF降低。预先给予L精氨酸处理,可抑制SU大鼠UI、溃疡底部坏死物质和周围组织中中性粒细胞浸润的增加,增加GMBF以及胃粘膜和血浆NO含量;相反,LNAME可进一步增加SU 大鼠UI、溃疡底部坏死物质和周围组织中中性粒细胞浸润,降低GMBF以及胃粘膜和血浆NO的含量。结论 NO在大鼠应激性溃疡中起重要的保护作用。关键词:L精氨酸; 应激性溃疡;一氧化氮;胃粘膜血流量
The Study of Preventive Mechanism of LArginine on Stress Ulcer in Rats
LI Jia,CHEN Hongxia,ZHANG Change
(Department of Pathophysiology,Xianning College,Xianning Hubei 437100,China)
ABSTRACT: Objective To observe the effects of nitric oxide(NO) on stress ulcer(SU)in rats.Methods The SU model of rats was induced with coldrestraint stress,and gastric mucosal blood flow (GMBF)was measured with the neutral red clearance method.After pretreatment with Larginine or NitroLarginine methyl ester(LNAME) in rats,the changes of GMBF,ulcer index(UI) and severity of tissue necrosis and neutrophil infiltration (TN&NI) were observed and gastric mucosal and plasma NO were measured. Results Compared with normal control group ......
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