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作 者:韩劲松[1] 历志[1] 王辉山[1] 尹宗涛[1] 薛晓东[1]
机构地区:[1]沈阳军区总医院心血管外科,辽宁省沈阳市110016
出 处:《中国心血管病研究》2016年第10期948-951,共4页Chinese Journal of Cardiovascular Research
基 金:2014年辽宁省自然科学基金项目(项目编号:2014020065);2015年辽宁省自然科学基金项目(项目编号:2015020407);2014年中华医学会胸心血管外科分会厄尔巴肯奖学金科研项目
摘 要:目的 探讨缺血预处理(IPC)对大鼠缺血再灌注(I/R)后心房肌缝隙连接蛋白43 (Cx43)和缝隙连接蛋白40(Cx40)表达和分布的影响.方法 30只Wistar大鼠随机分为假手术组(或对照组,n=5):只穿线不结扎左冠状动脉前降支;缺血再灌注组(I/R组,n=5):给予前降支结扎30 min,再灌注120min;早期缺血预处理组(IPC组,n=5):行IPC处理后,余处理同I/R组;延迟IPC组(L-IPC组,n=5):在IPC处理24h后,余处理同I/R组;早期远程缺血预处理组(RIPC组,n=5):给予RIPC后,余处理同I/R组;延迟RIPC组(L-RIPC组,n=5):RIPC处理24h后,余处理同I/R组.测量心房组织Cx40、Cx43的mRNA表达,Cx40、Cx43蛋白表达,以及用免疫组化法测定Cx40、Cx43的分布.结果 I/R组Cx43和Cx40在mRNA水平和蛋白水平均明显降低,分布无规律且侧面分布相对增加.而各种IPC方式(IPC、L-IPC、RIPC、L-RIPC)在I/R后,心房Cx43和Cx40 mRNA水平和蛋白水平下降不明显,其分布多于心肌细胞闰盘处,仅少量分布于心肌细胞侧面.结论 IPC能维持I/R后心房肌Cx43和Cx40的较高表达,并维持其空间分布相对稳定.Objective To study the impact of ischemic preconditioning (IPC) on atrial gap junction pro- tein connexin 43 (Cx43) and 40(Cx40) and their distribution after ischemia-reperfusion. Methods 30 Wistar rats were randomly divided into sham group (or a control group, n=5): only thread but not ligated left anterior descending coronary artery. Ischemia-reperfusion group(I/R group, n=5 ): ligated anterior descending artery 30 min, and then reperfusion 120 min. Early ischemic preconditioning group (IPC group, n=5 ): Line IPC after treatment, other deal with the same I/R group. Delayed IPC group (L-IPC group, n=5): In the IPC after treatment 24 h, other deal with the same I/R group. Early remote ischemic preconditioning group(RIPC group, n=5 ): After giving RIPC, other deal with the same I/R group. Delay RIPC Group(L-RIPC group, n=5): RIPC treatment after 24 h, deal with the same I/R group. MRNA expression measurements Cx40, Cx43 of atrial tissue, protein expression and assay Cx40, Cx43 by immunohistochemical staining distribution. Results I/R group Cx43 and Cx40 mRNA levels and protein levels were significantly reduced, irregular distribution and the relative increase in side profile. The variety of ways IPC (IPC, L-IPC, RIPC, L-RIPC ) after I/R, atrial Cx43 and Cx40mRNA no significant decline in levels and protein levels, and its distribution more than intercalated disk myocardial cells, only a small amount distributed in cardiomyocytes side. Conclusion IPC can maintain atrial Cx43 I/R after Cx40 expression and higher, and to maintain their spatial distribution is relatively stable.
分 类 号:Q95-33[生物学—动物学] R541.7[医药卫生—心血管疾病]
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