Dan Liu1, Min Zhang1, Wei Xie1, Gang Lan1, Hai-Peng Cheng1, Duo Gong1, Chong Huang1, Yun-Cheng Lv1, Feng Yao1, Yu-Lin Tan1, Liang Li1, Xi-Long Zheng2, Chao-Ke Tang3. 1. Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China. 2. Department of Biochemistry and Molecular Biology, Cumming School of Medicine, Libin Cardiovascular Institute of Alberta, University of Calgary, Health Sciences Center, 3330 Hospital Dr NW, Calgary T2N 4N1, Alberta, Canada. 3. Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China. Electronic address: tangchaoke@qq.com.
Abstract
RATIONALE: Excessive cholesterol accumulation in macrophages is a major factor of foam cell formation and development of atherosclerosis. Previous studies suggested that miR-486 plays an important role in cardiovascular diseases, but the underlying mechanism is still unknown. OBJECTIVE: The purpose of this study is to determine whether miR-486 regulates ATP-binding cassette transporter A1 (ABCA1) mediated cholesterol efflux, and also explore the underlying mechanism. METHODS AND RESULTS: Based on bioinformatics analysis and luciferase reporter assay, we transfected miR-486 mimic and miR-486 inhibitor into THP-1 macrophage-derived foam cells, and found that miR-486 directly bound to histone acetyltransferase-1 (HAT1) 3'UTR, and downregulated its mRNA and protein expression. In addition, our studies through transfection with wildtype HAT1 or shHAT1 (short hairpin HAT1) revealed that HAT1 could promote the expression of ABCA1 at both mRNA and protein levels. At the same time, the acetylation levels of the lysines 5 and 12 of histone H4 were upregulated after overexpression with HAT1. Meanwhile, the results of liquid scintillation counter and high performance liquid chromatography (HPLC) showed that miR-486 promoted cholesterol accumulation in THP-1 macrophages. CONCLUSION: These data indicated that miR-486 aggravate the cholesterol accumulation in THP-1 cells by targeting HAT1.
RATIONALE: Excessive cholesterol accumulation in macrophages is a major factor of foam cell formation and development of atherosclerosis. Previous studies suggested that miR-486 plays an important role in cardiovascular diseases, but the underlying mechanism is still unknown. OBJECTIVE: The purpose of this study is to determine whether miR-486 regulates ATP-binding cassette transporter A1 (ABCA1) mediated cholesterol efflux, and also explore the underlying mechanism. METHODS AND RESULTS: Based on bioinformatics analysis and luciferase reporter assay, we transfected miR-486 mimic and miR-486 inhibitor into THP-1 macrophage-derived foam cells, and found that miR-486 directly bound to histone acetyltransferase-1 (HAT1) 3'UTR, and downregulated its mRNA and protein expression. In addition, our studies through transfection with wildtype HAT1 or shHAT1 (short hairpin HAT1) revealed that HAT1 could promote the expression of ABCA1 at both mRNA and protein levels. At the same time, the acetylation levels of the lysines 5 and 12 of histone H4 were upregulated after overexpression with HAT1. Meanwhile, the results of liquid scintillation counter and high performance liquid chromatography (HPLC) showed that miR-486 promoted cholesterol accumulation in THP-1 macrophages. CONCLUSION: These data indicated that miR-486 aggravate the cholesterol accumulation in THP-1 cells by targeting HAT1.
Authors: Dimitry A Chistiakov; Alexandra A Melnichenko; Veronika A Myasoedova; Andrey V Grechko; Alexander N Orekhov Journal: J Mol Med (Berl) Date: 2017-08-07 Impact factor: 4.599
Authors: Loredan S Niculescu; Natalia Simionescu; Elena V Fuior; Camelia S Stancu; Mihaela G Carnuta; Madalina D Dulceanu; Mina Raileanu; Emanuel Dragan; Anca V Sima Journal: Mol Biol Rep Date: 2018-05-03 Impact factor: 2.316