Hypertriglyceridemia: lipoprotein receptors and atherosclerosis.

S. H. Gianturco, A. M. Gotto, W. A. Bradley

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

We have shown first, that apoB mediates the binding of small VLDL Sf 20-60 and IDL, as well as LDL, to the LDL receptor. Second, apoE of an appropriate, accessible conformation is required for the binding of large VLDL to the LDL receptor; HTG-VLDL Sf greater than 60 but not normal VLDL Sf greater than 60 have this apoE population. Third, the same population of apoE that mediates binding of HTG-VLDL Sf greater than 60 to the LDL receptor modulates its binding to the beta-VLDL receptor, but it is not required for the latter interaction. Fourth, a domain of processed apoB or apoB-48 in association with a domain of the inaccessible apoE is required for binding to and uptake by the beta-VLDL receptor. Fifth, our observations suggest that the abnormal catabolism of VLDL that occurs in hypertriglyceridemia may be explained by the abnormal uptake of HTG-VLDL by either the LDL or the beta-VLDL receptor pathway. Finally, we suggest that plasma proteases may route apoB/E-containing lipoproteins to macrophages for disposal, and this results in foam cell formation.

Original languageEnglish (US)
Pages (from-to)47-71
Number of pages25
JournalAdvances in experimental medicine and biology
Volume183
DOIs
StatePublished - 1985

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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