The chemical chaperone 4-phenylbutyric acid attenuates pressure-overload cardiac hypertrophy by alleviating endoplasmic reticulum stress

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• 作者：Chang Sik Park ; Hyeseon Cha ; Eun Jeong Kwon ; Pradeep Kumar Sreenivasaiah ; Do Han Kim ; ^{dhkim@gist.ac.kr}
• 关键词：GRP ; glucose related protein ; eIF2 ; eukaryotic initiation factor 2 ; PERK ; protein kinase RNA-like endoplasmic reticulum kinase ; PBA ; 4-phenylbutyric acid ; CHOP ; C/EBP-homologous protein ; IRE ; inositol-requiring enzyme ; ATF ; activating transcription factor
• 刊名：Biochemical and Biophysical Research Communications
• 出版年：2012
• 期刊代码：159_0006291x
• 类别：bio
• 出版时间：11 May, 2012
• 卷：421
• 期：3
• 页码：578-584
• 文件大小：796 K

摘要

Evidence has shown that endoplasmic reticulum stress (ERS) is associated with the pathogenesis of cardiac hypertrophy. The aim of this study was to investigate whether direct alleviation of ER stress by 4-phenylbutyric acid (PBA), a known chemical chaperone drug, could attenuate pressure-overload cardiac hypertrophy in mice. The effects of orally administered PBA (100 mg/kg body weight daily for a week) were examined using mice undergoing transverse aortic constriction (TAC-mice), an animal model to produce pressure overload. TAC application for 1 week led to a 1.8-fold increase in the ratio of the heart weight over body weight (HW/BW) and up-regulation of the hypertrophy markers ANF and BNF accompanied by up-regulation of ERS markers (GRP78, p-PERK, and p-elF2伪). The oral administration of PBA to the TAC-mice reduced hypertrophy (19%) and severely downregulated the fibrosis-related genes (transforming growth factor-尾1, phospho-smad2, and pro-collagen isoforms). We conclude that ERS is induced as a consequence of remodeling during pathological hypertrophy and that PBA may help to relieve ERS and play a protective role against cardiac hypertrophy and possibly heart failure. We suggest PBA as a novel therapeutic agent for cardiac hypertrophy and fibrosis.