EGCG inhibits pressure overload-induced cardiac hypertrophy via the PSMB5/Nmnat2/SIRT6-dependent signalling pathways
| Autor: | Yang He, Shan-Shan Yu, Peiqing Liu, Yi Cai, Si Gao, Xue Ying Bi, Ting Ting Chen, Jian Tao Ye, Guo Dong Zheng, Ting Dong Yan |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
SIRT6 Proteasome Endopeptidase Complex Physiology Cardiomegaly 030204 cardiovascular system & hematology complex mixtures Catechin Rats Sprague-Dawley 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Animals Sirtuins Electrophoretic mobility shift assay Myocytes Cardiac Cells Cultured Pressure overload Gene knockdown food and beverages NF-κB Angiotensin II PSMB5 Cell biology Rats 030104 developmental biology chemistry Signal transduction |
| Zdroj: | Acta physiologica (Oxford, England)REFERENCES. 231(4) |
| ISSN: | 1748-1716 |
| Popis: | Aim Epigallocatechin-3-gallate (EGCG), the major polyphenol found in green tea, exerts multiple protective effects against cardiovascular diseases, including cardiac hypertrophy. However, the molecular mechanism underlying its anti-hypertrophic effect has not been clarified. This study revealed that EGCG could inhibit pressure overload-induced cardiac hypertrophy by regulating the PSMB5/Nmnat2/SIRT6-dependent signalling pathway. Methods Quantitative real-time 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. Results 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-κB 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 β-5, chymotrypsin-like) was required for EGCG-induced Nmnat2 protein expression. Additionally, we demonstrated that EGCG might interact with PSMB5 and inhibit the activation of the proteasome. Conclusions 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-dependent signalling pathway, suggesting the therapeutic potential of EGCG in the prevention and treatment of cardiac hypertrophy. |
| Databáze: | OpenAIRE |
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