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Remnants produced from rat chylomicrons in hepatectomized rats or from human chylomicrons by incubation in postheparin plasma contained much less C-apolipoproteins, but more lysophosphatidylcholine than the parent chylomicrons. A phospholipid-triglyceride emulsion absorbed C-apolipoproteins during incubation in serum, yet not in postheparin plasma, which led to lipid-hydrolysis and increased in lysophosphatidylcholine. The fraction d = 1.006-1.019 g/ml of human serum comprised more lysophosphatidylcholine and less C-apolipoproteins than the fraction d less than 1.006 g/ml. Injection of heparin induced hydrolysis with an increase in lysophosphatidylcholine and loss of C-apolipoproteins in both fractions. These inverse changes of lysophosphatidylcholine and C-apolipoproteins during lipid-hydrolysis suggest a causal relationship, which is strongly supported by the induction of loss of C-apolipoproteins from rat chylomicrons and human triglyceride-rich lipoproteins by addition of lysophosphatidylcholine in vitro. Apolipoprotein C-II was more affected than C-III. These results may elucidate a mechanism for the regulation of the termination of the triglyceride hydrolysis and the final hepatic uptake of remnants.

Influence of lysophosphatidylcholine on the C-apolipoprotein content of rat and human triglyceride-rich lipoproteins during triglyceride hydrolysis.