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Apolipoproteins (apo) C-I, C-II, and C-III play crucial roles in intravascular lipid metabolism. Whereas apo C-II is an obligate cofactor for lipoprotein lipase, apo C-III was shown to inhibit its action. Apo C-I can be a potent cofactor of human lecithin:cholesterol acyltransferase. Structural mutants and deficiencies of apo C-II lead to hypertriglyceridemia. A similar phenotype is associated with apo C-III mutants and is inducible by overexpression of human apo C-III in transgenic animals. No structural variant has so far been reported for apo C-I. The present paper describes a rapid semi-automated procedure for isoelectric focusing analysis of these C-apolipoproteins from whole plasma or serum and their visualization by immunofixation and silver staining. The procedure allows detection of charged variants of C-apolipoproteins. As applied to 295 patients with coronary heart disease and 85 controls, it also serves to detect deficiency syndromes of these apolipoproteins. The procedure provides reliable, easy and quick analysis of C-apolipoproteins applicable as a routine or screening procedure not restricted to specialized laboratories.

Semi-Automated Rapid Isoelectric Focusing of Apolipoproteins C from Human Plasma Using PhastSystem™ and Immunofixation