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cardiac hypertrophy and improves the mitochondrial function. However, the specific activation mechanism and drugs that can effectively activate UPRmt in the cardiac muscle are yet to be elucidated. The aim of this study was to determine the regulation role of UPRmt on preventing pathological cardiac hypertrophy by tetrahydrocurcumin (THC) and explore its underlying molecular mechanism. Male C57BL\/6J wild-type (WT) mice were divided into a control group and subjected to sham treatment for 4 weeks, and a test group which was subjected to transverse aortic constriction (TAC) surgery. Animals in the control and test group were orally administered THC (50\u2009mg\/kg) for 4 weeks after TAC procedure; an equivalent amount of saline was orally administered in the control sham-treated group and the TAC group. Subsequently, oxidative stress and UPRmt markers were assessed in these mice, and cardiac hypertrophy, fibrosis, and cardiac function were tested. Small interfering RNA (siRNA) targeting proliferator-activated receptor-gamma coactivator (PGC)-1\u03b1 and activating transcription factor 5 (ATF5) were used to determine the UPRmt activation mechanism. THC supplement partly upregulated UPRmt effectors and inhibited TAC-induced oxidative stress compared with TAC-operated WT mice, thereby substantially attenuating contractile dysfunction, cardiac hypertrophy, and fibrosis. Furthermore, PGC-1\u03b1 knockdown blunted the UPRmt activation and the cardioprotective role of THC. The interaction between PGC-1\u03b1 and ATF5 was tested in neonatal rat cardiac myocytes under normal conditions. The results showed that PGC-1\u03b1 was an upstream effector of ATF5 and partly activated UPRmt. In vitro, phenylephrine- (PE-) induced cardiomyocyte hypertrophy caused ATF5 upregulating rather than downregulating corresponding to the downregulation of PGC-1\u03b1. The PGC-1\u03b1\/ATF5 axis mediated the UPRmt activation and stress-resistance role of THC in vitro. Collectively, the present study provides the first evidence that PGC-1 and ATF5 can form a signaling axis to partly activate UPRmt that mediates the cardioprotective role of THC in pathological cardiac hypertrophy.<\/jats:p>","DOI":"10.1155\/2020\/9187065","type":"journal-article","created":{"date-parts":[[2020,12,29]],"date-time":"2020-12-29T00:50:44Z","timestamp":1609203044000},"page":"1-21","source":"Crossref","is-referenced-by-count":39,"title":["Novel PGC-1\u03b1\/ATF5 Axis Partly Activates UPRmt and Mediates Cardioprotective Role of Tetrahydrocurcumin in Pathological Cardiac Hypertrophy"],"prefix":"10.1155","volume":"2020","author":[{"given":"Bing","family":"Zhang","sequence":"first","affiliation":[{"name":"Department of Cardiovascular Surgery, Xijing Hospital, The Fourth Military Medical University, 127 Changle West Road, Xi\u2019an, 710032, 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