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:
影响因子:
--
通讯作者:
Fernández-Hernando C
中科院分区:
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
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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