Ischemic heart failure enhances endogenous myocardial apelin and APJ receptor expression.

Ischemic heart failure enhances endogenous myocardial apelin and APJ receptor expression.
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DOI:
10.2478/s11658-006-0058-7
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发表时间:
2007
影响因子:
8.3
通讯作者:
Joseph Woo Y
Joseph Woo Y
中科院分区:
生物学1区
文献类型:
--
作者:
Atluri P;Morine KJ;Liao GP;Panlilio CM;Berry MF;Hsu VM;Hiesinger W;Cohen JE;Joseph Woo Y

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爱帕琳与APJ受体相互作用以增强肌力。在心力衰竭中,apelin-APJ偶联可提供增强心肌功能的手段。对于缺血性心肌病的爱帕琳肽和APJ受体浓度的变化知之甚少。我们研究了缺血性心肌病背景下内源性apelin和APJ水平的代偿性变化。雄性刘易斯大鼠进行LAD结扎,并在6周内进展为心力衰竭。相应动物行假开胸术作为对照。在初始手术后六周,在外源性爱帕琳-13输注的存在下对动物进行血液动力学功能分析,并将心脏固定用于蛋白质印迹和酶免疫分析。心肌APJ浓度的蛋白质印迹分析表明,心力衰竭时APJ受体蛋白水平升高(1890750±133500 vs. 901600±143120强度单位,n=8,p=0.00001)。总爱帕琳蛋白水平随着缺血性心力衰竭而增加,如通过酶免疫测定(12.0±4.6 vs. 1.0±1.2 ng/ml,n=5,p=0.006)和蛋白质印迹(1579400±477733 vs. 943000±157600强度单位,n=10,p=0.008)所证实。输注apelin-13显著增强假手术和衰竭心脏的心肌功能。我们的结论是,总心肌apelin和APJ受体水平增加,缺血性心肌病的补偿。
Apelin interacts with the APJ receptor to enhance inotropy. In heart failure, apelin-APJ coupling may provide a means of enhancing myocardial function. The alterations in apelin and APJ receptor concentrations with ischemic cardiomyopathy are poorly understood. We investigated the compensatory changes in endogenous apelin and APJ levels in the setting of ischemic cardiomyopathy. Male, Lewis rats underwent LAD ligation and progressed into heart failure over 6 weeks. Corresponding animals underwent sham thoracotomy as control. Six weeks after initial surgery, the animals underwent hemodynamic functional analysis in the presence of exogenous apelin-13 infusion and the hearts were explanted for western blot and enzyme immunoassay analysis. Western blot analysis of myocardial APJ concentration demonstrated increased APJ receptor protein levels with heart failure (1890750±133500 vs. 901600±143120 intensity units, n=8, p=0.00001). Total apelin protein levels increased with ischemic heart failure as demonstrated by enzyme immunoassay (12.0±4.6 vs. 1.0±1.2 ng/ml, n=5, p=0.006) and western blot (1579400±477733 vs. 943000±157600 intensity units, n=10, p=0.008). Infusion of apelin-13 significantly enhanced myocardial function in sham and failing hearts. We conclude that total myocardial apelin and APJ receptor levels increase in compensation for ischemic cardiomyopathy.
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期刊: HYPERTENSION
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