MiR-33 contributes to the regulation of cholesterol homeostasis.

MiR-33 contributes to the regulation of cholesterol homeostasis.
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DOI:
10.1126/science.1189862
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发表时间:
2010-06-18
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Fernández-Hernando C
Fernández-Hernando C
中科院分区:
其他
文献类型:
--
作者:
Rayner KJ;Suárez Y;Dávalos A;Parathath S;Fitzgerald ML;Tamehiro N;Fisher EA;Moore KJ;Fernández-Hernando C

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胆固醇代谢在细胞水平上受到严格的调节。在这里,我们表明,miR-33,内含子microRNA(miRNA)位于编码固醇调节元件结合因子-2(SREBF-2),胆固醇合成的转录调节因子的基因内,调节参与细胞胆固醇转运的基因的表达。在小鼠和人类细胞中,miR-33抑制三磷酸腺苷结合盒(ABC)转运蛋白ABCA 1的表达,从而减弱胆固醇向载脂蛋白A1的流出。在小鼠巨噬细胞中,miR-33还靶向ABCG 1,减少胆固醇流出至新生高密度脂蛋白(HDL)。miR-33的慢病毒递送抑制肝脏中ABCA 1的表达,降低循环HDL水平。相反,体内miR-33的沉默增加了ABCA 1的肝脏表达和血浆HDL水平。因此,miR-33似乎调节肝脏中的HDL生物合成和细胞胆固醇流出。
Cholesterol metabolism is tightly regulated at the cellular level. Here we show that miR-33, an intronic microRNA (miRNA) located within the gene encoding sterol-regulatory element–binding factor–2 (SREBF-2), a transcriptional regulator of cholesterol synthesis, modulates the expression of genes involved in cellular cholesterol transport. In mouse and human cells, miR-33 inhibits the expression of the adenosine triphosphate–binding cassette (ABC) transporter, ABCA1, thereby attenuating cholesterol efflux to apolipoprotein A1. In mouse macrophages, miR-33 also targets ABCG1, reducing cholesterol efflux to nascent high-density lipoprotein (HDL). Lentiviral delivery of miR-33 to mice represses ABCA1 expression in the liver, reducing circulating HDL levels. Conversely, silencing of miR-33 in vivo increases hepatic expression of ABCA1 and plasma HDL levels. Thus, miR-33 appears to regulate both HDL biogenesis in the liver and cellular cholesterol efflux.
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