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Chen CP, Chan KC, Ho HH, Huang HP, Hsu LS, Wang CJ. Mulberry polyphenol extracts attenuated senescence through inhibition of Ras/ERK via promoting Ras degradation in VSMC. Int J Med Sci 2022; 19:89-97. [PMID: 34975302 PMCID: PMC8692108 DOI: 10.7150/ijms.64763] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 11/04/2021] [Indexed: 02/06/2023] Open
Abstract
Ageing is one of the major risk factors of human diseases, including cancer, diabetes, and cardiovascular disease. Mulberry exhibits a wide range of functions, such as anti-oxidant, anti-inflammation, and anti-diabetes. In this study, we investigated the role of mulberry polyphenol extract (MPE) in K-Ras-induced senescence of smooth muscle cells. Forced expression of K-Ras enhanced senescence of smooth muscle A7r5 cells as shown by the elevation of β-galactosidase activity. Treatment with MPE significantly repressed the Ras, phosphorylated ERK, and β-galactosidase level. MPE triggered the association of cyclins with their corresponding cyclin-dependent protein kinases and hyperphosphorylated retinoblastoma (RB). MPE also down-regulated the levels of K-Ras-induced CDK inhibitors. MPE enhanced the phosphorylated AMP-dependent protein kinase (AMPK) and inducible nitric oxide synthase (iNOS) level in the presence of K-Ras. Pretreatment with either L-NAME or AMPK inhibitor reversed the effects of MPE. In addition, L-NAME and AMPK inhibitor repressed the MPE-induced total and phosphorylated 3-hydroxy-3-methylglutaryl coenzyme A (HMG-Co A) level. MPE repressed K-Ras-induced G0/G1 arrest, whereas L-NAME and AMPK inhibitor blocked the effects of MPE. Our results indicated that MPE recovered the K-Ras-induced senescence of vascular smooth muscle cells through iNOS and AMPK-dependent pathway. Our findings suggested that MPE may prevent ageing-induced atherosclerosis.
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Affiliation(s)
- Ching-Pei Chen
- Cardiovascular division of Changhua Cristian Hospital, Changhua, Taiwan
| | - Kuei-Chuan Chan
- School of Medicine, Chung Shan Medical University, Taichung 402, Taiwan.,Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, 402, Taiwan
| | - Hsieh-Hsun Ho
- Institute of Biochemistry and Biotechnology, Chung Shan Medical University, Tai-chung, 402, Taiwan
| | - Hui-Pei Huang
- Department of Biochemistry, School of Medicine, Medical College, Chung Shan Medical University, Taichung, 402, Taiwan
| | - Li-Sung Hsu
- Institute of Medicine, Chung Shan Medical University, Taichung, 402, Taiwan.,Clinical Laboratory, Chung Shan Medical University Hospital, Taichung, 402, Taiwan
| | - Chau-Jong Wang
- Department of Health Diet and Industry Management, Chung Shan Medical University, Taichung 402, Taiwan.,Department of Medical Research, Chung Shan Medical University Hospital, Taichung, 402, Taiwan
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