百草枯中毒大鼠肺组织热休克蛋白70表达及乌司他丁干预研究

The study of the expression of heat shock protein 70 in lung tissue of rats with acute paraquat poisoning and the invention with ulinastatin

目的 观察热休克蛋白70（HSP70）在百草枯（Paraquat PQ）中毒大鼠肺组织中表达及乌司他丁干预对其影响.方法 72只Spragne-Dawley（SD）大鼠随机（随机数字法）分为3组：空白对照组（A组）、染毒组（B组）和乌司他丁组（C组）,每组各24只.B组和C组PQ灌胃（80 mg/kg）染毒建立急性中毒模型.C组于PQ灌胃后30 min腹腔注射给UTI（10万U·kg-1·d-1）.观察染毒后12,24,48,72 h各组肺组织HSP70的表达、湿/干重比（W/D）和病理改变.HSP70采用逆转录聚合酶链反应（RT-PCR）测定.计量资料以均数±标准差（（x）±s）表示,组间单因素方差分析,结果以P＜0.05为差异有统计学意义.结果 与A组相比,各时间点B组和C组肺组织HSP70的表达明显增强,尤以C组为甚,差异有统计学意义.B组和C组肺组织病理检查可见PQ中毒后肺泡壁充血、炎性细胞浸润,并有局灶性出血.但C组病理改变较轻.结论 乌司他丁增强HSP70的表达,从而减轻PQ中毒大鼠急性肺损伤.

Objective To observe the expression of heat shock protein 70 （HSP70） in lung of rats after paraquat （PQ） poisoning and to investigate the therapeutic effects of ulinastatin. Method Seventy-two adult healthy SD rats were randomly（random number） divided into control group （group A, n = 24）, poisoning group （group B, n =24） and ulinastatin group （group C, n =24）. The rat models of acute PQ poisoning were established by intra-gastric administration of 80 mg/kg PQ to rats of group B and group C, and the rats of group C were intra-peritoneally injected with 100 000 IU/kg ulinastatin 30 minutes after poisoning. The expression of HSP70 in lung tissue was observed, and W/D and histopathological changes in lung tissue were compared 12 h,24 h,48 h and 72 hours after poisoning. The expression of HSP70 in lung tissue was assayed by using RT-PCR. All quantitative data were processed with one-way analysis of variance to compare multiple sample means. Results Compared with group A, the expression of HSP70 in the lung of rats in group B and group C increased significantly at all intervals （ P ＜ 0.05）. The pathological changes in lung tissue of rats with PQ poisoning showed mainly congestion,leukocytes infiltration and local hemorrhage, and the pathological changes in lung tissue of group C were significantly lessened. Conclusions Ulinastatin may ameliorate the acute lung injury to a certain extent after PQ poisoning in rats by enhancing the expression of HSP70.