AIM: To investigate the effects of fenofibrate on angiotensin Ⅱ ( AngⅡ)-induced cardiomyocyte hypertrophy .METHODS:Primary neonatal cardiomyocytes were pretreated with fenofibrate (10μmol/L) for 1 h followed by stimulation with AngⅡ(100 nmol/L).The mRNA levels of ANF, BNP andβ-MHC were measured by real-time PCR. Western blotting was employed to determine the nuclear translocations of NFATc 4 and p65-NFκB.Co-immunoprecipitation was used to investigate the interaction of NFATc 4 with p65-NFκB in the nucleus of cardiomyocytes .In addition, the DNA binding activity of NFATc4 on the BNP promoter was determined by EMSA .RESULTS:Fenofibrate significantly inhibited AngⅡ-induced cardiomyocyte hypertrophy .Fenofibrate treatment inhibited the nuclear translocations of NFATc 4 and p65-NFκB, as well as the interactions of NFATc 4 with p65-NFκB in the nucleus of cardiomyocytes induced by AngⅡ.Fenofi-brate inhibited the binding activity of NFATc 4 with the BNP promoter , which was strengthened by AngⅡ.CONCLU-SION:Fenofibrate enhances the interaction of NFATc 4 with PPARα, decreases the interaction of NFATc 4 with p65-NFκB in the nucleus of cardiomyocytes , and inhibits the DNA binding activity of NFATc 4 induced by AngⅡ, which may be the important mechanisms of fenofibrate on inhibiting cardiac hypertrophy .%目的：研究PPARα激动剂非诺贝特（ fenofibrate ）对血管紧张素Ⅱ（ AngⅡ）诱导的心肌细胞肥大的影响及机制。方法：在AngⅡ诱导的心肌细胞肥大模型中加入非诺贝特（10μmol／L）预处理1 h后，采用real-time PCR检测肥大标志物ANF、BNP和β-MHC mRNA水平变化，Western blotting检测NFATc4和p65-NFκB核转位的变化，免疫共沉淀检测心肌细胞核内p65-NFκB与NFATc4之间的相互作用， EMSA检测NFATc4在BNP启动子上DNA结合活性的变化。结果：非诺贝特可显著抑制AngⅡ诱导的心肌细胞肥大。非诺贝特可抑制AngⅡ诱导的NFATc4和p65-NFκB的入核，以及两者在核内的相互作用。非诺贝特可抑制AngⅡ诱导的NFATc4在BNP启动子上DNA结合活性的增加。结论：非诺贝特可增强心肌细胞核内PPARα与NFATc4之间的相互作用，并减弱p65-NFκB与NFATc4之间的相互结合，进而降低NFATc4在BNP启动子上的DNA结合活性，这可能是其抑制AngⅡ诱导的心肌肥大的重要机制。
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