Proteomic Analysis of Hypertrophied Left Ventricle in Spontaneously Hypertensive Rats / 中华高血压杂志

ABSTRACT

Objective To investigate the molecular mechanisms for the development of cardiac hypertrophy in hypertension,the present study provided the differential protein expression analysis of hypertrophied heart at differ- ent stages in spontaneously hypertensive rats (SHR).Methods The profiles of protein expression of left ventricu lar myocardium in SHR and its normotensive control Wistar-Kyoto (WKY) rats at the age of 4 and 20 weeks were analyzed with two-dimensional gel electrophoresis (2-DE) in combination with matrix assisted laser desorption ioniza- tion-time of flight (MALDI-TOF-TOF) mass spectrometry.Results Although the blood pressure of SHR was normal at 4 weeks age,hypertrophy of the left ventricle had already developed.The expression pattern in the hy- pertrophic myocardium was found 27 modulated proteins,20 of which were identified.These proteins are involved in reactions of energy metabolism,mitoehondrial oxidative phosphorylation and oxidative stress,etc.The expres- sion of 13 proteins was significantly changed in SHR rats at early stage prior to the development of sustained hyper- tension,while the expression changes of other 7 proteins occurred only at late stage in SHR rats when the blood pressure was significantly elevated.Conclusions lncrease in glycolysis and decrease in oxidation of fatty acid and glucose was shown in the hypertrophied myocardium from early stage in SHR prior to the development of hyperten sion.The significant changes in protein expression of the mitochondrial electron transport chain and antioxidative molecules support the hypothesis that oxidative stress promotes and accelerates the development of hypertensive car- diac hypertrophy.