Abstract
Extensive heterogeneity in particle size distribution of serum lipoproteins of baboons was resolved by a procedure that combined Sudan black B prestaining, polyacrylamide gradient gel electrophoresis (GGE), and quantitative densitometry. Each densitometric scan represented a continuous distribution of the relative amount of cholesterol in a serum sample, as a function of the lipoprotein particle size. For analytical purposes, each scan was divided into 12 fractions, representing 12 particle size ranges. The relationship between the estimated cholesterol concentrations in the summed GGE/densitometric fractions corresponding to very low-density lipoproteins (VLDL) + low-density lipoproteins (LDL) and those corresponding to high-density lipoproteins (HDL) and concentrations measured by the heparin-Mn2+ precipitation/enzymatic procedure was linear over a broad range. However, a systematic overestimation of HDL cholesterol concentration and an underestimation of VLDL + LDL cholesterol concentration was apparent. Therefore, correction factors were developed for adjusting the estimates of VLDL + LDL and HDL cholesterol concentrations obtained by the GGE/densitometric method. This analytical method is rapid, repeatable, economical, and useful for genetic and dietary research in which cholesterol concentrations in multiple particle size ranges of lipoproteins must be measured in large numbers of samples. It also is adaptable to immunoblotting procedures for detecting the distribution of specific apolipoproteins among the size-resolved lipoproteins.
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This research was supported by NIH Grant HL28972.
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Cheng, M.L., Kammerer, C.M., Lowe, W.F. et al. Method for quantitating cholesterol in subfractions of serum lipoproteins separated by gradient gel electrophoresis. Biochem Genet 26, 657–681 (1988). https://doi.org/10.1007/BF02395514
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DOI: https://doi.org/10.1007/BF02395514