细胞凋亡在肝吸虫感染大鼠及肝吸虫病患者肝损伤的作用

目的 分析肝吸虫感染大鼠和肝吸虫病患者肝组织的病理改变及损伤情况,探讨细胞凋亡在肝吸虫感染所致肝损伤中的作用.方法 将Wistar大鼠分为2组:感染组60只,对照组20只.感染组大鼠经口饲感染囊蚴法建立肝吸虫感染模型,对照组大鼠采用生理盐水灌胃.于感染后第4、6、8、12周时处死动物.同时收集尸检获得的肝吸虫病患者及健康对照人体肝组织标本各4例.光镜下观察大鼠和人体肝吸虫感染情况以及肝组织的病理学改变;并用TUNEL法检测肝细胞的凋亡率.结果 光镜下各时间点感染组大鼠和肝吸虫病患者胆管壁增厚,胆管黏膜呈乳头状和腺瘤样增生,管腔内可见虫体及虫卵,胆管周围可见炎细胞浸润和少量纤维组织增生,汇管区周围有一些肝细胞出现核固缩,呈现细胞凋亡的形态特征.感染组大鼠第4、6、8、12周时肝细胞凋亡率分别为(7.15±1.50)%、(11.61±3.09)%、(13.21±3.47)%、(11.26±4.06)%,均明显高于对照组(2.57±0.72)%、(3.17±0.77)%、(3.67±0.96)%、(2.84±0.87)%,t值分别为4.45、5.49、5.95、4.74,P均<0.01].肝吸虫病患者肝组织细胞凋亡率为(12.02±1.78)%,明显高于对照组(2.03±0.68)%,t=15.13,P<0.01].结论 肝吸虫感染可以引起宿主肝细胞凋亡,后者可能与感染者肝损伤有关.

Abstract：

Objective To investigate the liver injury and pathological changes of rat and patients with Clonorchis sinensis(C, sinensis) infection, and to clarify the role of apoptosis in the injury induced by C. sinensis.Methods Wistar rats were divided into two group: 60 in infection group and 20 in control. The rats in infection group were infected with C. sinensis via oral feeding encysted cercaria;rats in control group were fed with normal saline. The rats were sacrificed 4, 6, 8 and 12 weeks after infection, respectively. Liver tissue specimens of the patients infected with C. sinensis were collected. The pathological changes of liver tissue were observed by light microscopy and the apoptofic rate of hepatocyte was detected by terminal deoxynucleotidyl transferase dUTP nick end labeling(TUNEL) assay. Results Parasites and eggs could he seen around the bile duct, and the duct was associated with mucosa and adenoma papillary hyperplasia, wall thickening, inflammatory cell infiltration, a small amount of fibrous tissue hyperplasia, and periportal liver cells surrounded by a number of nuclear condensation, all these changes meant morphological characteristics of apoptosis. Apoptotic rates of liver cells in infection group 4, 6,8 and 12 weeks after infection were (7.15 ± 1.50)%,(11.61 ± 3.09)%,(13.21 ± 3.47)% and (11.26 ± 4.06)%,respectively, which was significantly higher than that in control group (2.57 ± 0.72)%, (3.17 + 0.77)%, (3.67 ±0.96)% and (2.84 ± 0.87)%, t values were 4.45, 5.49, 5.95 and 4.74, respectively, all P < 0.01]. Conclusions These findings indicate that C, sinensis can stimulate both hepatoeytic apoptosis and degeneration which may he related to clinical manifestations and liver lesions in patients with clonorchiasis.

Role of apoptosis in hepatic injury of rat and patients with Clonorchis sinensis infection

Objective To investigate the liver injury and pathological changes of rat and patients with Clonorchis sinensis(C, sinensis) infection, and to clarify the role of apoptosis in the injury induced by C. sinensis.Methods Wistar rats were divided into two group: 60 in infection group and 20 in control. The rats in infection group were infected with C. sinensis via oral feeding encysted cercaria;rats in control group were fed with normal saline. The rats were sacrificed 4, 6, 8 and 12 weeks after infection, respectively. Liver tissue specimens of the patients infected with C. sinensis were collected. The pathological changes of liver tissue were observed by light microscopy and the apoptofic rate of hepatocyte was detected by terminal deoxynucleotidyl transferase dUTP nick end labeling(TUNEL) assay. Results Parasites and eggs could he seen around the bile duct, and the duct was associated with mucosa and adenoma papillary hyperplasia, wall thickening, inflammatory cell infiltration, a small amount of fibrous tissue hyperplasia, and periportal liver cells surrounded by a number of nuclear condensation, all these changes meant morphological characteristics of apoptosis. Apoptotic rates of liver cells in infection group 4, 6,8 and 12 weeks after infection were (7.15 ± 1.50)%,(11.61 ± 3.09)%,(13.21 ± 3.47)% and (11.26 ± 4.06)%,respectively, which was significantly higher than that in control group (2.57 ± 0.72)%, (3.17 + 0.77)%, (3.67 ±0.96)% and (2.84 ± 0.87)%, t values were 4.45, 5.49, 5.95 and 4.74, respectively, all P < 0.01]. Conclusions These findings indicate that C, sinensis can stimulate both hepatoeytic apoptosis and degeneration which may he related to clinical manifestations and liver lesions in patients with clonorchiasis.