کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1952707 1057224 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Suppression of ABCA1 by unsaturated fatty acids leads to lipid accumulation in HepG2 cells
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Suppression of ABCA1 by unsaturated fatty acids leads to lipid accumulation in HepG2 cells
چکیده انگلیسی

Abnormal lipid metabolism may contribute to the pathogenesis of non-alcoholic steatohepatitis (NASH). ATP-binding cassette transporter A1 (ABCA1) mediates the transport of cholesterol and phospholipids from cells to HDL apolipoproteins. We previously reported that unsaturated fatty acids destabilise ABCA1 in murine macrophages and ABCA1-transfected baby hamster kidney cells by increasing its protein degradation. Here, we examined the correlation between ABCA1 and hepatic lipids. In HepG2 cells, unsaturated but not saturated fatty acids suppressed ABCA1 protein levels by promoting its protein degradation. Over-expression of ABCA1 resulted in a decrease of cellular fatty acids and triglycerides, while repression by ABCA1 siRNA increased both cellular fatty acids and triglycerides. Rats with NASH also showed lower ABCA1 protein levels in liver cells, compared with that of the normal rats. These data indicate that steatosis is associated with a decrease in ABCA1 protein expression leading to an increase in lipid storage in hepatocytes. And it further suggests that this effect could be due to an excess of unsaturated fatty acids.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimie - Volume 92, Issue 8, August 2010, Pages 958–963
نویسندگان
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