败血症休克大鼠组织中性内肽酶与肾上腺髓质素的相关关系研究  

Relationship between the tissue neutral endopeptidase and the adrenomedullin in blood and tissues of rats with septic shock

作　　者：蒋维[1] 蒋宏峰[2] 蔡大勇[1] 潘春水[2] 齐永芬[2] 庞永正[1] 唐朝枢[1] 

机构地区：[1]北京大学第一医院心血管病研究所,北京100034 [2]北京大学基础医学院生理学与病理生理学系,北京100083

出　　处：《中国病理生理杂志》2004年第12期2167-2174,共8页Chinese Journal of Pathophysiology

基　　金：国家重点基础研究发展规划项目基金(973)资助(No.G2000056905)

摘　　要：目的观察败血症休克大鼠组织肾上腺髓质素(ADM)含量和中性内肽酶(NEP)的活性及其表达水平,以探讨NEP的变化在休克时组织ADM水平变化中的意义。方法盲肠结扎穿孔方法复制大鼠败血症性休克模型,采用放射免疫方法和荧光分光光度法分别检测血浆和组织的ADM含量和NEP的活性,用半定量RT-PCR和免疫组织化学法分别检测NEP的mRNA及其蛋白的组织分布。结果ADM和NEP广泛分布于大鼠的血浆和组织。休克早期,大鼠各组织ADM含量普遍高于对照组,NEP活性在心脏和小肠低于对照组,在血浆中高于对照组,在肺、肾和主动脉无明显变化。免疫组化结果显示,休克早期NEP在大鼠心脏、主动脉内膜和中膜的分布低于对照组。休克晚期,除大鼠小肠的ADM含量低于休克早期,血浆和其余组织的ADM含量均高于休克早期;与休克早期比较,NEP的活性除在大鼠肾脏无明显变化外,在血浆和其余组织均明显降低。NEP的免疫组化结果显示,休克晚期,NEP在大鼠心脏、主动脉内膜和中膜、肺和肾的分布弱于休克早期,在主动脉外膜无明显变化。RT-PCR结果显示,休克晚期大鼠心脏、主动脉、肺脏和小肠的NEPmRNA表达均显著低于对照组。结论NEP在大鼠败血症休克的不同时期和不同组织中的变化与ADM含量的变化不一致,提示休克过程中,不同组织局部的NEP对ADM含量的影响不同。AIM: The activity and expression of neutral endopeptidase (NEP) and the adrenomedullin (ADM) contents in various tissues were observed in septic shock and control rats to study the possible role of NEP in the change of ADM contents in tissues during septic shock. METHODS: The septic shock model of rats were established by cecal ligation and puncture (CLP). ADM contents, NEP activities, level of NEP mRNA and NEP protein were measured. RESULTS: (1) In early septic shock (ES), the ADM contents were generally higher in detected tissues, the NEP activity in left ventricle and small intestine were lower and was higher in blood than those in controls, and in lung, kidney and aorta were similar with the controls. NEP immunoreactive staining were less in lung, left ventricle, endothelium and media of aorta, but more in adventitia of aorta and kidney than those of the controls; (2) In late septic shock (LS), the ADM contents in small intestine was less but in plasma and other tissues were higher, and the NEP activity were less in plasma and other tissues than those in ES. The NEP immunoreactive staining were less in heart, endothelium and media of aorta, lung and kidney than those in ES, and was no significant change in adventitia of aorta compared with those of ES. RT-PCR found that NEP gene expression were significantly less in left ventricle, aortas, lung and small intestine than those in the controls. CONCLUSIONS: In septic shock rats, the NEP activity changes heterogeneously but the ADM contents elevate in most tissues. These results indicate that during the septic shock, the local concentrations and actions of ADM in various tissues may be regulated differently by the NEP. [

关 键 词：休克 脓毒性 肾上腺髓质素 内肽酶类 

分 类 号：R332.2[医药卫生—人体生理学]