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A new electrophoresis of lipoproteins was examined as a means of defining hyperlipoproteinemia phenotypes. The serum lipoproteins of 119 patients with hyperlipoproteinemia whose serum total cholesterol (TC) concentration was more than 250 mg and/or whose triglyceride (TG) concentration exceeded 180 mg per 100 ml were determined by using a method of electrophoretic separation of lipoproteins on agarose and enzymic staining of each lipid component separately. Based on the lipoprotein-lipid profile with the acid of various parameters for distinction, i.e., Type II A, LDL-C greater than or equal to 180 mg/dl: Type IV, VLDL-TG greater than or equal to 130 mg/dl: type II B, LDL-C greater than or equal to 130 mg/dl, 119 patients were classified into Fredrickson's phenotypes of hyperlipoproteinemia. The percentages of phenotypes with those hyperlipoproteinemias were: type II A, 31.1%; II B, 33.6; IV, 29.4%; and V, 5.9% respectively. But types I and III were not observed in this survey. The characteristics of the lipoprotein profiles of each phenotype were clearly identified, and they were: type II A, high peak LDL-C and decrease of HDL-C fraction; II B, high peak of LDL-C and VLDL-TG; IV, high peak of VLDL-TG; V, prominence of chylomicrons and high VLDL-TG peak. The serial observations of the lipoprotein-lipid profiles were very useful for detecting the progressive changes in lipoproteins which occurred during the course of diseases, particularly in cases of secondary hyperlipoproteinemia. In conclusion, the new lipoprotein-lipid profile based on the agarose electrophoresis-enzymic staining method not only offers great help in classification of hyperlipoproteinemia but has contributed to therapeutic management.

japanese journal of medicine

Studies on the phenotyping system of hyperlipoproteinemias. Evaluation of a new method by enzymic staining of lipids in serum lipoproteins separated by electrophoresis on agarose.