血小板生成素抑制阿霉素大鼠心肌细胞氧化损伤的实验研究

目的研究血小板生成素（TPO）对大鼠阿霉素（ADM）心肌细胞损伤的拮抗作用并探讨其机制。方法32只Wistar大鼠被随机分成4组，分别为对照组、ADM组、ADM＋TPOL组、ADM＋TPOH组。对照组给予生理盐水，其余各组给予ADM20mg／kg腹腔内注射，TPO干预组则加用不同剂量的TPO（10μg／kg或30μg/kg，隔天1次，共3次）。采用ELISA法测大鼠血清CK—MB及cTNI；观察电子显微镜下心肌细胞超微结构的变化；利用免疫组织化学染色观察心肌细胞组织学改变及DNA氧化损伤产物8-羟基脱氧乌苷（8-OHdG）表达情况，应用IPP6．0软件，计算累积光密度（IOD）及8-OHdG index。结果加用TPO干预后CK—MB、cTN1的活力较ADM组明显下降（P〈0．01）；电子显微镜下ADM组心肌细胞超微结构损害较TPO干预组严重；TPO干预组心肌组织病理损伤减轻，IOD、8-OHdG index值较其他各组明显降低（P〈0．01）上述指标在ADM＋TPOL组及ADM＋TPOH组间差异无统计学意义（P〉0．05）。结论TPO通过拮抗阿霉素对心肌的氧化损伤来发挥心脏保护作用。

Experimental study on thrombopoietin providing protection against adriamycin-induced oxidative damage of myocardial cell in rats

Objective To inwst the antagonistic effect of thrombopoietin on adriamycin induced myocardium injury in rats and explore the mechanism.Methods 32 Wistar rats were randomized into four groups(n=8):Control group,ADM group,ADM+TPOL group and ADM+TPOH group.All agents were given by intraperitoneal injection.The control group was given saline.While the other three groups were given adriamycin at the dosage of20mg/kg.TPO group were injected TPO at the dosages of 10μg/kg or 30μg/kg three times on alternale days.ELISA was used to detect the concentration of CK-MB and cTnI in the serum of rats.The change of cardiocyte ultrastructure was observed by the electron microscope,and pathological change Was observed by immunohistochemistry staining.The expression level of 8- hydroxy-2'-deoxyguanosin(8-OHdG)produced by DNA oxidative damage in myocard tissue were detected.IPP6.0 software was used to detect IOD and calculate the 8-OHdG index.Results The energy of CK-MB and cTNI of TPO group was obviously lower than that in ADM group(P<0.01).The ultragtrueture of cardiocyte in the ADM group Wag damaged more severely than that in TPO group.Pathological Score,IOD and 8-OHdG index of TPO groups were lower than ADM group(P<0.05).These indexes had no significant statistics difference between ADM+TPOL group and ADM+TPOH group.Conclusions TPO can provide heart protection by antagonizing oxidative damage of myocardial cell induced by edriamycin.