Cited by 383Cholesterol and Lipid MetabolismLipoproteins and Cardiovascular HealthLipid metabolism and disorders

Lipoprotein binding to canine hepatic membranes. Metabolically distinct apo-E and apo-B,E receptors.

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Hui, D.Y., Innerarity, T.L., Mahley, R.W.·1981·Journal of Biological Chemistry

Abstract

Hepatic membranes from adult dog livers have receptors which bind to lipoproteins containing the E apoprotein (the apo-E HDLc) but lack specific receptors for the apo-B-containing low density lipoproteins (LDL). Scatchard analysis of direct binding data for 125I-apo-E-HDLc revealed nonlinearity of the binding which could be resolved into two components, suggesting the presence of two separate binding sites. The binding site for apo-E HDLc that possessed the highest affinity (Kd = 0.23 x 10(-9) M) was calcium-dependent and was sensitive to proteolytic digestion with pronase. The lower affinity (Kd = 20 x 10(-9) M) binding site for apo-E HDLc did not require calcium and was resistant to pronase digestion. Chemical modification of the arginyl or lysyl residues of the apo-E HDLc prevented the HDLc from binding to the higher affinity receptor but had no effect on their binding to the lower affinity site. Adult canine liver membranes also bound canine 125I-HDL. However, the binding of HDL was of lower affinity (Kd = 8.2 x 10(-8) M), did not require calcium, was not blocked by modification of the lysyl or arginyl residues, and may not be of physiologic significance. Although the liver membranes from normal chow-fed adult dogs did not bind canine LDL, it was possible to demonstrate specific high affinity binding of LDL under certain metabolic conditions in dogs. When adult dogs were treated with the hypocholesterolemic agent cholestyramine, the liver membranes from these animals read…

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Crossref · 10.1016/s0021-9258(19)69254-9

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Authors
Hui, D. Y., Innerarity, T. L., & Mahley, R. W.
Affiliations
University of California System (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1981-06
Volume
256
Issue
11
Pages
5646-5655
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1488147530
Cited by
383
References
2
Citations by year
2020: 1 · 2019: 1 · 2018: 2 · 2015: 2 · 2014: 1 · 2013: 3 · 2012: 1
FWCI
85.81
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
Keywords
lipoprotein receptors, canine liver, HDL cholesterol, low-density lipoprotein, receptor binding sites, calcium-dependent binding, cholestyramine, hypocholesterolemia, receptor binding affinity, Scatchard analysis
MeSH terms
Animals, Apolipoproteins, Apolipoproteins B, Apolipoproteins E, Calcium, Cell Membrane, Cholestyramine Resin, Dogs, Edetic Acid, Female, Hydrogen-Ion Concentration, Kinetics, Lipoproteins, HDL, Lipoproteins, VLDL, Liver, Male, Receptors, Cell Surface, Low Density Lipoprotein Receptor-Related Protein-1

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