Effects of plasma infusion on plasma lipids, apoproteins and plasma enzyme activities in familial lecithin: cholesterol acyltransferase deficiency |
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Authors: | N Murayama Y Asano K Kato Y Sakamoto S Hosoda N Yamada T Kodama T Murase Y Akanuma |
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Affiliation: | Department of Internal Medicine, Jichi Medical school, Minamikawachimachi, Tochigi, Japan and Third Department of Internal Medicine, University of Tokyo, Hongo, Tokyo, Japan |
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Abstract: | Abstract. The siblings presented here are the third family found in Japan with familial LCAT deficiency. Their post-heparin plasma lipoprotein lipase and hepatic triglyceride lipase activities were measured selectively by an immunochemical method. Plasma triglyceride levels were elevated, and post-heparin plasma lipoprotein lipase was decreased only in a patient with nephropathy, while hepatic triglyceride lipase activities were within reference limits in both patients. The plasma concentrations of apo A-I, apo A-II, and apo B were reduced in both patients. On the other hand, the plasma concentration of apo E was markedly increased. Enzyme replacement therapy by plasma transfusion in the propositus resulted in marked improvement of deranged compositions of triglyceride-rich lipoproteins. Also, improvement of the plasma apo E concentration was demonstrated, while the improvement of post-heparin lipase did not occur. These results suggest that LCAT may play an important physiological role in triglyceride metabolism as well as in cholesterol metabolism. |
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Keywords: | LCAT deficiency lecithin: cholesterol acyl-transferase activity lipoprotein lipase activity lipoproteins apoproteins |
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