文章基本信息

标题：[13C]cholesterol as a tracer for studies of cholesterol metabolism in humans.
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作者：R E Ostlund ; D E Matthews
期刊名称：JLR Papers In Press
印刷版ISSN：0022-2275
电子版ISSN：1539-7262
出版年度：1993
卷号：34
期号：10
页码：1825-1831
语种：English
出版社：American Society for Biochemistry and Molecular Biology
摘要：The investigation of cholesterol metabolism in humans would be facilitated by the availability of a tracer that is not radioactive. However, to be useful such a tracer must be detectable in the large pool of body cholesterol over an extended time. To meet these requirements we used synthetic [23,24,25,26,27-13C5]cholesterol with detection by isotope ratio mass spectrometry (IRMS), a technique in which the ratio of 13CO2/12CO2 can be determined with high precision in the combustion products of a biological sample. [13C]cholesterol (65 mg) and [14C]cholesterol (15 microCi) were solubilized in Intralipid and injected simultaneously (IV) into three normal subjects, and plasma samples were obtained over the ensuing 10 weeks. Cholesterol was isolated from plasma and either counted for radioactivity or combusted to CO2 and analyzed by IRMS. [14C]cholesterol and [13C]cholesterol tracer concentrations in plasma were very similar. [13C]cholesterol kinetic parameters calculated using a standard two-compartment cholesterol turnover model and a new three-compartment minimal model were 103 +/- 10.5 SD % of those computed from corresponding [14C]cholesterol data. These results show that [13C5]cholesterol can be used as a practical tracer for cholesterol metabolic studies lasting many weeks.