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However, the molecular mechanism underlying its anti\u2010hypertrophic effect has not been clarified. This study revealed that EGCG could inhibit pressure overload\u2010induced cardiac hypertrophy by regulating the PSMB5\/Nmnat2\/SIRT6\u2010dependent signalling pathway.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Quantitative real\u2010time polymerase chain reaction and western blotting were used to determine the expression of mRNA and protein respectively. A fluorometric assay kit was used to determine the activity of SIRT6, a histone deacetylase. Luciferase reporter gene assay and electrophoretic mobility shift assay were employed to measure transcriptional activity and DNA binding activity respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>EGCG could significantly increase Nmnat2 protein expression and enzyme activity in cultured neonatal rat cardiomyocytes stimulated with angiotensin II (Ang II) and heart tissues from rats subjected to abdominal aortic constriction. Nmnat2 knockdown by RNA interference attenuated the inhibitory effect of EGCG on cardiac hypertrophy. EGCG blocked NF\u2010\u03baB DNA binding activity induced by Ang II, which was dependent on Nmnat2 and the subsequent SIRT6 activation. Moreover the activation of PSMB5 (20S proteasome subunit \u03b2\u20105, chymotrypsin\u2010like) was required for EGCG\u2010induced Nmnat2 protein expression. Additionally, we demonstrated that EGCG might interact with PSMB5 and inhibit the activation of the proteasome.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>These findings serve as the first evidence that the effect of EGCG against cardiac hypertrophy may be, at least partially, attributed to the modulation of the PSMB5\/Nmnat2\u2010dependent signalling pathway, suggesting the therapeutic potential of EGCG in the prevention and treatment of cardiac hypertrophy.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apha.13602","type":"journal-article","created":{"date-parts":[[2020,12,15]],"date-time":"2020-12-15T02:05:17Z","timestamp":1607997917000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["EGCG inhibits pressure overload\u2010induced cardiac hypertrophy via the PSMB5\/Nmnat2\/SIRT6\u2010dependent signalling 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Pharmacy Zhujiang Hospital Southern Medical University Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"He","sequence":"additional","affiliation":[{"name":"BayRay Innovation Center Shenzhen Bay Laboratory Shenzhen China"},{"name":"Institute of Molecular and Cell Biology Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue Ying","family":"Bi","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology School of Pharmaceutical Sciences Sun Yat\u2010Sen University Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Si","family":"Gao","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Toxicology School of Pharmaceutical Sciences Sun Yat\u2010Sen University Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ting Dong","family":"Yan","sequence":"additional","affiliation":[{"name":"Department of 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