黄芪甲苷对镉致大鼠睾丸支持细胞相关蛋白表达及p38MAPK磷酸化的拮抗作用

摘要

目的：探讨镉对培养大鼠睾丸支持细胞相关蛋白表达、p38M A PK磷酸化及超微结构的影响和黄芪甲苷的保护效应。方法对照组、镉（50 mol/L ）处理组、镉（50 mol/L ）加黄芪甲苷（10 mg/L ）组的培养支持细胞用于超微结构观察、波形蛋白、E-钙粘连蛋白/-环连蛋白免疫组织化学及磷酸化p38M A PK检测。结果镉处理组支持细胞线粒体内室肿胀，脂滴堆积，内质网扩张和（或）空泡化，髓样结构形成，少许支持细胞出现凋亡，镉加黄芪甲苷组支持细胞超微结构改变较镉处理组轻；免疫组织化学显示镉处理组波形蛋白、E-钙粘连蛋白及-环连蛋白阳性产物较对照组明显减弱（P＜0．05），镉加黄芪甲苷组阳性产物虽较对照组减少但明显高于镉处理组（P＜0．05）；镉处理组支持细胞内磷酸化P38MAPK阳性产物表达量较对照组明显增强，且有向细胞核移位趋势，镉加黄芪甲苷组阳性产物表达量明显少于镉处理组（P＜0．05）。结论镉致大鼠睾丸支持细胞超微结构损伤、细胞骨架蛋白及粘连蛋白破坏并增强 P38MAPK磷酸化；黄芪甲苷可拮抗镉的毒性，其保护效应可能与减少 P38MAPK的磷酸化等有关。%Objective To investigate the toxic effect of cadmium (Cd) on the ultrastructure ,expression of related protein and the signal molecule phosphrylated P38 mitogen-actived protein kinase(P-P38MAPK) of primary cultured rat sertoli cell(Sc) ,and the protective effect of astragaloside (A ) on it .Methods The primary cultured rat Sc were divided into the control group ,Cd (50 mol/L)group and Cd(50 mol/L) plus A(10 mg/L) group ,they were used for the electron microscope observation and the im-munohistochemistry detection of vimentin ,E-cadherin ,-catenin and P-P38MAPK .Results The Sc ultrastructural changes included that the swelled mitochondria ,abundant lipid droplets and dilated endoplasmic reticulum were found in the Cd group .Further ,apop-tosis occurred in some Sc .However these ultrastructure changes above mentioned were slighter in the Cd plus A group ;the immu-nohistochemistry showed that the positive products of vimentin ,E-cadherin and-catenin were obviously decreased in the Cd group (P<0 .05) ,and those in the Cd plus A group were higher compared with the Cd group(P<0 .05);the expression of P-P38MAPK in cytoplasm was increased in the Cd group ,and showed the trend to move from cytoplasm to nucleus ,meanwhile ,the positive prod-ucts expression in the Cd plus A group was lower than that in the Cd group (P<0 .05) .Conclusion Cadmium can cause the injury of the Sc ultrastructure ,damage of cytoskeletal protein and fibronectin ,and increase of P-P38MAPK level ;astragaloside can antago-nize the toxicity of cadmium on Sc ,the protective effect maybe related with the decrease of P-P38MAPK in Sc .