title: Why very low density lipoprotein levels are normal in familial hyperchylomicronaemia.
abstract: The anomalous finding that very low density lipoprotein levels are relatively normal in patients with familial hyperchylomicronaemia has never been satisfactorily explained, particularly in view of the marked reduction or absence of peripheral lipoprotein lipase activity characteristic of this condition. I propose that the discrepancy between the plasma levels of the two triglyceride-rich lipoprotein fractions in these patients is due to the secretion by the liver of triglyceride in the form of chylomicron-like particles, rather than as very low density lipoprotein. The proposed "switch" in the spectrum of lipoproteins secreted by the liver is probably contingent upon the activity of the hepatic lipase present on the liver cell plasma membrane.
mesh_terms: D002784:Cholesterol / Q000378:metabolism; D002914:Chylomicrons / Q000096:biosynthesis / Q000097:blood; D005230:Fatty Acids, Nonesterified / Q000097:blood; D006801:Humans; D008072:Hyperlipoproteinemia Type I / Q000097:blood*; D006951:Hyperlipoproteinemias / Q000097:blood*; D008049:Lipase / Q000378:metabolism; D008079:Lipoproteins, VLDL / Q000097:blood*; D008099:Liver / Q000378:metabolism; D014280:Triglycerides / Q000096:biosynthesis
chemical_list: D002914:Chylomicrons; D005230:Fatty Acids, Nonesterified; D008079:Lipoproteins, VLDL; D014280:Triglycerides; D002784:Cholesterol; D008049:Lipase