期刊
NUTRITION RESEARCH
卷 29, 期 12, 页码 859-866出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.nutres.2009.10.016
关键词
Plant sterol; sitosterol; stigmasterol; NPC1L1; SR-BI; cholesterol absorption; FHs 74 Int cells
资金
- USDA-NRI [2007-35200-18298]
- University of Nebraska Agricultural Research Division
- University of Nebraska Research Council
Intake of plant sterols has long been shown to reduce cholesterol absorption and subsequently plasma cholesterol concentrations Despite competition between plant sterols and cholesterol for incorporation into mixed micelles as a suggested major mechanism for the inhibition of cholesterol absorption by plant sterols, studies exist to support an alternative mechanism For example, another mechanism may be the action of plant sterols to reduce cholesterol absorption at the cellular level. This study was undertaken to test the hypothesis that plant sterols can modulate the expression of transporters such as Niemann-Pick C1-like 1 (NPC1L1) and scavenger receptor class B, type I (SR-BI) to lower intestinal cholesterol absorption. FHs 74 Int cells, a human small intestine epithelial cell line, were used as a model of enterocytes. The cells were treated with 25 alpha-hydroxycholesterol (25 mu mol/L) or 250 mu mol/L of silosterol, stigmasterol, and cholesterol for 24 hours to measure genes involved in cholesterol absorption and metabolism by quantitative real-time polymerase chain reaction 25 alpha-Hydroxycholesterol, cholesterol, and sitosterol significantly reduced the messenger RNA (mRNA) expression of NPC1L1 and hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase, whereas SR-BI mRNA was not altered by the sterols. Western blot analysis confirmed the reduction in NPC1L1 by sterols Depletion of cellular cholesterol by mevinolin, a cholesterol synthesis inhibitor, increased NPC1L1 and HMG-CoA reductase mRNA; and repletion of cholesterol abolished the increase Sitosterol, but not stigmasterol, reduced the mRNA levels of NPC1L1 and HMG-CoA reductase to a similar extent of cholesterol. In conclusion, sitosterol can inhibit the expression of NPC1L1 in the enterocytes, which could be an alternate mechanism for plant sterols to reduce intestinal cholesterol uptake (C) 2009 Elsevier Inc. All rights reserved.
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