促红细胞生成素对挫裂伤脑组织线粒体的影响

目的 探讨重组促红细胞生成素(rhEPO)对大鼠颅脑损伤后脑线粒体能量代谢以及线粒体呼吸功能的影响.方法 健康雄性SD大鼠63只,随机分为rhEPO治疗组(n=28):以自由落体法制作大鼠腑挫裂伤模型,伤后立即腹腔注射rhEPO 10 U/g,每10 h重复注射1次;对照组(n=28):同样脑挫裂伤模型,伤后立即腹腔注射相同剂量生理盐水;假手术组(n=7):只钻孔不致伤.采用生化检测的方法分别测定治疗组治疗后6 h、12 h、24 h和48 h及各自的对照组大鼠脑组织线粒体ATP酶和SOD的活性和MDA水平以及线粒体呼吸功能.各组数值进行F和t检验.结果 重组促红细胞生成素治疗后12 h、24 h和48 h治疗组大鼠脑组织线粒体ATP酶、SOD活性和呼吸功能均高于各自时间点对照组(P＜0.05,P＜0.01,P＜0.01),而MDA水平则明显低于各自对照组(P＜0.01).结论 重组促红细胞生成素可以通过影响线粒体能量代谢及呼吸功能而减轻大鼠创伤性脑损伤后的继发性脑损害.

The effect of recombinant human erythropoietin on the function of brain mitochondria after brain injury

Objective To investigate the therapeutic effects of recombinant human erythropoietin(rhEPO)on brain mitochondrial energy metabolism and mitachondrial respiratory functionin after brain injury in rats.Method A total of 63 Sprague-Dawley rats were divided randomly into three groups:the rhEPO treated group(n =28),the control group(n=28),the shanl group(n=7).The models of contusion of brain caused by freefalling were set up in rhEPO treated group(n=28).The recombinant human erythropoietin was intraperitoneally injected in dose of 10 U/g immediately after brain injury and it was repeated every 10 hours in rhEPO group treated.The same models of contused brain were made without rhEPO treatment as control group(n=28).In control group,the same volume of normal saline was used in replacemem of rhEPO.Aburr hole was made on the skull of the sham group(n=7),but the brain tissue was not wounded.The mitochondria were isolated at 6 h,12 h,24h,48 h after trealment,respectively.The activity of ATPase and SOD,the content MDA and brain mitochondrial respiratory function were measured by biochemical technique.The data were analyzed with the F-test and t-test.Results The activity of ATPase(P＜0.05),SOD(P＜0.01)and brain mitochondrial respiratory function(P ＜0.05)were increased.and the levd of MDA in brain mitochondria was reduced markedly in rats treated with rhEPO.Conclusions Treatment with rhEPO can alleviates the secondary brain injury by affecting mitochondrial function.