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• W3081876084 abstract "The constitutive photomorphogenic 9 (COP9) signalosome complex subunit 6 (COPS6/CSN6) is crucial for structural integrity of the COP9 signalosome complex. CSN6 participates in various aspects of cancer progression, but its role in hypertrophic cardiomyopathy is not clear. Here, we found that the expression of CSN6 was increased in Angiotensin II (Ang II)-induced hypertrophic mice hearts and neonatal rat cardiomyocytes (NRCMs). Inhibition of CSN6 decreased the cardiomyocyte size and fetal genes’ expression in Ang II-induced hypertrophic NRCMs, while overexpression of CSN6 aggravated Ang II-induced myocardial hypertrophy. Moreover, we demonstrated that the pro-hypertrophic function of CSN6 was mediated by SIRT2, which acts as a cardioprotective factor in pathological cardiac hypertrophy. CSN6 inhibited the expression of SIRT2, and re-expression of SIRT2 attenuated the myocardial hypertrophy caused by CSN6 overexpression. Further investigation discovered that CSN6 suppressed the expression of SIRT2 via up-regulating Nkx2.2, a transcription suppressor of SIRT2. Mechanistically, CSN6 blocked the ubiquitin proteasome system-mediated degradation of Nkx2.2 protein by interacting with it and inhibiting its ubiquitination directly in cardiomyocytes. Finally, our data showed that CSN6 was partially dependent on the stabilization of Nkx2.2 protein to inhibit SIRT2 and promote myocardial hypertrophy. Overall, our study identified CSN6 as a pro-hypertrophic deubiquitinase, and CSN6 inhibition may be a potential treatment strategy for heart failure." @default.
• W3081876084 created "2020-09-08" @default.
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• W3081876084 date "2020-11-01" @default.
• W3081876084 modified "2023-10-17" @default.
• W3081876084 title "CSN6 aggravates Ang II-induced cardiomyocyte hypertrophy via inhibiting SIRT2" @default.
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• W3081876084 doi "https://doi.org/10.1016/j.yexcr.2020.112245" @default.
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