蒙古沙鼠幽门螺杆菌感染动物模型的建立  

Establishment of Helicobacter pylori infection model in Mongolian gerbil

作　　者：严杰[1] 胡爱萍[1] 李强[1] 方海伟[1] 张苗尊[1] 

机构地区：[1]浙江大学医学院病原生物学教研室,浙江杭州310031

出　　处：《浙江大学学报（医学版）》2003年第1期21-23,28,共4页Journal of Zhejiang University(Medical Sciences)

基　　金：国家教育部优秀年轻教师基金;浙江省科技厅项目(0 0 1110 438)

摘　　要：目的 :建立稳定、可靠的幽门螺杆菌 (Hp) NCTC11637株和临床分离的 Y0 6株沙鼠感染模型 ,观察感染沙鼠胃粘膜组织的病理改变。方法 :蒙古沙鼠随机分成 6组标准菌株组 (n=6)和 6组临床菌株组 (n=6) ,另设置 6组阴性对照 (n=4 )。用布氏肉汤配制哥伦比亚血琼脂培养的 NCTC11637株和 Y0 6株菌液。标准菌株组和临床菌株组各3组用 2× 10 8CFU/ ml菌液 0 .5 ml1次灌胃。标准菌株组和临床菌株组各 3组分别用 2× 10 9CFU/ ml菌液 0 .5 ml灌胃 ,连续 3次 ,每次间隔 2 4 h。末次感染后的第 2、4、6周处死沙鼠 ,取胃粘膜组织标本进行尿素酶试验、分离培养、常规病理学和 Hp免疫组化检查。结果 :1次感染的标准菌株组和临床菌株组第 2、4、6周的感染率分别为 0 %、0 %、66.7%和 0 %、16.7%、16.7%。 3次感染的标准菌株和临床菌株组第 2、4、6周的感染率分别为 66.7%、10 0 %、10 0 %和 66.7%、66.7%、10 0 %。分离结果阳性的感染动物胃粘膜细胞表面和胃小凹有 Hp定植 ,固有层出现少量慢性炎症细胞的浸润。结论 :高浓度 (1× 10 9CFU) Hp多次经口感染沙鼠可制备稳定、可靠的幽门螺杆菌感染动物模型 ,感染动物胃粘膜组织有 Hp定植并出现轻度的炎症反应。Objective: To establish a stable and reliable model of Helicobacter pylori infection in Mongolian gerbil and to observe pathological changes in gastric mucosa from the infected animals. Methods: Mongolian gerbils were randomly divided into six groups infected with H.pylori strain NCTC11637 (n=6, group N), six groups infected with H.pylori clinical strain Y06 (n=6, group Y) and six groups as negative control (n=4, group C). H.pylori suspensions at the concentrations of 2×108 CFU/ml and 2×109 CFU/ml of strain NCTC11637 and strain Y06 were prepared with Brucella broth from Columbia agar containing sheet blood. The animals in one group N and in one group Y were orally challenged once with 0.5 ml of 2×108 CFU/ml H.pylori suspension. The animals in another group N and in another group Y were orally challenged with 0.5 ml of 2×109 CFU/ml H.pylori suspension for three times at the intervals of 24 hours, respectively. The animals were killed after 2nd, 4th and 6th week of the last infection and the gastric mucosal samples were taken for urease test, bacterial isolation, routine pathological and H.pylori histochemical examinations. Results: Infection rates of the animals in group N and group Y at the 2nd, 4th and 6th week after one challenge were 0%, 0%, 66.7% and 0%, 16.7%, 16.7%, respectively. Infection rates of the animals in groups N and Y at the 2nd, 4th and 6th week after three challenges were 66.7%, 100%, 100% and 66.7%, 66.7%, 100%, respectively. In animals with positive bacterial isolation H.pylori was found to colonized on the surface of gastric mucosal cells and in the gastric pits, and the lamina propria of gastric mucosal was infiltrated with chronic inflammatory cells. Conclusion: By using H.pylori suspension at high concentration of 1×109 CFU for multiple times, the orally challenged Mongolian gerbils can be prepared as a stable and reliable H.pylori infection model. H.pylori can colonize in gastric mucosa of the infected animals, and mild inflammation reactions can be seen.

关 键 词：幽门螺杆菌 螺杆菌感染 疾病模型 蒙古沙鼠 

分 类 号：R-332[医药卫生]