کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2051890 1074213 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Expression of ATP binding cassette-transporter ABCG1 prevents cell death by transporting cytotoxic 7β-hydroxycholesterol
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Expression of ATP binding cassette-transporter ABCG1 prevents cell death by transporting cytotoxic 7β-hydroxycholesterol
چکیده انگلیسی

Oxysterols result from cholesterol by enzymatic or oxidative processes. Some exert cytotoxic effects leading to necrosis or apoptosis. Detoxification of these compounds mainly occurs in the liver and requires transport from peripheral tissues towards it. Some ATP-binding cassette transporters are involved in export of cytotoxic compounds. In the current study, we investigated whether ABC transporter family member G1 (ABCG1) may be involved in oxysterol transport, since its gene expression is highly responsive to oxysterol loading. TetOff HeLa cells stably expressing ABCG1 showed decreased mass uptake of 7β-hydroxycholesterol (7β-HC) whereas that of other physiologically relevant oxysterols was unaffected. Application of 7β-HC to ABCG1 expressing cells induced hyperpolarization of mitochondrial membrane potential and production of reactive oxygen species, indicating energy consumption by the ATP-binding cassette transporter when it is activated by its correct substrate. Our study points to detoxification as one of potential cellular functions of ABCG1. We assume that ABCG1 protects against 7β-HC-induced cell death, an important role in prevention of neurodegenerative and cardiovascular disease.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 581, Issue 8, 17 April 2007, Pages 1673–1680
نویسندگان
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