51. Inhibition of EZH2 attenuates coronary heart disease by interacting with microRNA-22 to regulate the TXNIP/nuclear factor-κB pathway
- Author
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Yuping Lei, Yong Liu, Chuanzhong Dai, Wenzhen Wu, and Wen Liu
- Subjects
Male ,Vascular smooth muscle ,Physiology ,Cell ,Myocytes, Smooth Muscle ,Apoptosis ,Coronary Disease ,030204 cardiovascular system & hematology ,Umbilical vein ,03 medical and health sciences ,0302 clinical medicine ,Downregulation and upregulation ,Cell Movement ,Physiology (medical) ,medicine ,Human Umbilical Vein Endothelial Cells ,Humans ,Enhancer of Zeste Homolog 2 Protein ,Cells, Cultured ,Cell Proliferation ,Nutrition and Dietetics ,Cell growth ,Chemistry ,NF-kappa B ,General Medicine ,Middle Aged ,Up-Regulation ,MicroRNAs ,medicine.anatomical_structure ,cardiovascular system ,Cancer research ,Female ,Carrier Proteins ,Chromatin immunoprecipitation ,030217 neurology & neurosurgery ,TXNIP ,Signal Transduction - Abstract
New findings What is the central question of this study? The relevance of microRNA-22 (miR-22) has been indicated in coronary heart disease (CHD). How does it exert a protective role in CHD? What is the main finding and its importance? EZH2 inhibited transcription of the miR-22 promoter, thus modulating cell proliferation in human umbilical vein endothelial cells and vascular smooth muscle cells to induce CHD. Abstract MicroRNA-22 (miR-22) was indicated to modulate cell proliferation in human umbilical vein endothelial cells (HUVECs) under exposure to environmental toxicants. In the present study, we investigated the involvement of miR-22 in the mediation of HUVEC and vascular smooth muscle cell (VSMC) function, hence in the development of coronary heart disease (CHD). miR-22 expression was reduced in serum of CHD patients. Restoration of miR-22 decreased the proliferation, migration and invasion of VSMCs and increased apoptotic cells and inflammatory factors. In contrast, upregulation of miR-22 led to opposite trends in HUVECs. Chromatin immunoprecipitation and dual-luciferase assays validated that enhancer of zeste 2 polycomb repressive complex 2 subunit (EZH2) inhibited transcription of miR-22 promoter. EZH2, overexpressed in serum from CHD patients, diminished VSMC apoptosis, but facilitated HUVEC apoptosis. Luciferase reporter assays confirmed that thioredoxin-interacting protein (TXNIP) was a new direct target of miR-22. Overexpression of TXNIP blocked the function of miR-22 in HUVECs and VSMCs. Taken together, these findings will shed light on the role and mechanism of EZH2 in viability, migration, invasion and apoptosis via the miR-22/TXNIP axis in VSMCs and HUVECs, which might provide new insights into the treatment of CHD.
- Published
- 2020