心肌细胞凋亡在老年性心衰发生中的作用  被引量:5

Cardiomyocyte apoptosis might result in age-related heart failureCardiomyocyte apoptosis might result in age-related heart failure

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作  者:张武宁[1] 陈牧雷[2] 范谦[2] 杨新春[2] 

机构地区:[1]北京市房山区第一医院心内科,北京市102400 [2]首都医科大学附属北京朝阳医院心脏中心

出  处:《中国心血管病研究》2012年第4期297-301,320,共6页Chinese Journal of Cardiovascular Research

基  金:国家自然科学基金-青年科学基金(30800448);2010年度北京市科技新星计划(20108048)

摘  要:目的探讨心肌细胞凋亡在老年心衰发生中的作用。方法制备大鼠心肌缺血/再灌注(MI/R)模型。雄性SD大鼠被分为4个实验组:青年假手术组(2个月,16只)、老年假手术组(24个月,16只)、青年手术组(2个月,16只)和老年手术组(24个月,16只)。心肌缺血/再灌注组大鼠的左冠状动脉近中段被阻断30rain后恢复血流再灌注3h和24h。通过MillarMikro—Tip导管压力换能器对大鼠左心室(LV)功能指标进行检测,从而对sD大鼠心脏功能进行评价。采用原位末端标记检测(TUNEL)法和Caspase-3活性检测评价心肌细胞凋亡水平,同时测定大鼠血浆中凋亡标志物sFas、TNF—α和IL-6水平。对大鼠心肌组织使用伊文氏蓝-TTC染色并测定血浆cTnI水平以确定心肌坏死程度。结果与青年大鼠相比,老年大鼠在心肌缺血/再灌注后心功能明显降低,同’时心肌细胞凋亡水平及心肌细胞坏死程度显著增加。血浆凋亡标志物的检测结果也表现出相同的趋势。结论年龄导致了缺血/再灌注后心功能的显著降低,心肌细胞凋亡水平的增加可能是引发上述现象的主要原因。Objective To investigate the role of myocardial apoptosis in elderly heart failure. Methods Prepared myocardial ischemia/reperfusion (MI/R) model of Male Sprague-Dawley rats (2 month and 24 month) and they were randomized to receive either sham or MI (ischemia 30 min and reperfusion 3/24 h) and were divid- ed into the foUowing groups (n=16 each): (1)young sham, (2)old sham, (3)young MI, and (4)old MI. Cardiac function (hemodynamics) and cardiomyocytes death (Evans blue-TrC staining, TUNEL staining and caspase-3) were measured by using MiUar, Mikro-Tipcatheter pressure transducer indicator. The content of plasma apoptotic markers (sFas, TNF-α, IL-6) was tested. Results Compared to young rats, the old rats manifested decreased cardiac function. Animal TUNEL staining and caspase activity revealed a greater higher myocardial apoptotic ratio in the old rats group. Additionally, the significantly increased plasma apoptotic marker levels were found in old rats. Conclusion Aging led to a significant decrease of cardiac function after ischemia/reperfusion. Differential myocardial apoptosis may play a vital role in these phenomena.

关 键 词:老年 心肌缺血/再灌注 心力衰竭 细胞凋亡 心功能 

分 类 号:Q95-33[生物学—动物学] R541.6[医药卫生—心血管疾病]

 

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