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标题：Filipin recognizes both GM1 and cholesterol in GM1 gangliosidosis mouse brain
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作者：Julian R. Arthur ; Karie A. Heinecke ; Thomas N. Seyfried 等
期刊名称：JLR Papers In Press
印刷版ISSN：0022-2275
电子版ISSN：1539-7262
出版年度：2011
卷号：52
期号：7
页码：1345-1351
DOI：10.1194/jlr.M012633
语种：English
出版社：American Society for Biochemistry and Molecular Biology
摘要：Filipin is an antibiotic polyene widely used as a histochemical marker for cholesterol. We previously reported cholesterol/filipin-positive staining in brain of β-galactosidase (β-gal) knockout (^−/−) mice (GM1 gangliosidosis). The content and distribution of cholesterol and gangliosides was analyzed in plasma membrane (PM) and microsomal (MS) fractions from whole-brain tissue of 15 week-old control (β-gal^+/−) and GM1 gangliosidosis (β-gal^−/−) mice. Total ganglioside content (μg sialic acid/mg protein) was 3-fold and 7-fold greater in the PM and MS fractions, respectively, in βgal^−/− mice than in βgal^+/− mice. GM1 content was 30-fold and 50-fold greater in the PM and MS fractions, respectively. In contrast, unesterified cholesterol content (μg/mg protein) was similar in the PM and the MS fractions of the βgal^−/− and βgal^+/− mice. Filipin is known to bind to various sterol derivatives and phospholipids on thin-layer chromatograms. Biochemical evidence is presented showing that filipin also binds to GM1 with an affinity similar to that for cholesterol, with a corresponding fluorescent reaction. Our data suggest that the GM1 storage seen in the β-gal^−/− mouse contributes to the filipin ultraviolet fluorescence observed in GM1 gangliosidosis brain. The data indicate that in addition to cholesterol, filipin can also be useful for detecting GM1.
关键词：cholesterol/trafficking ; ganglioside ; lipid raft ; phospholipid/phosphatidylcholine ; phospholipid/phosphatidylethanolamine ; sphingolipid ; storage disease