Binding of Hyaluronate and Chondroitin Sulphate to Liver Endothelial Cells

Overview

Journal Biochem J

Specialty Biochemistry

Date 1986 Mar 15

PMID 3087347

Citations 39

Authors

T C Laurent

J R Fraser

H Pertoft

B Smedsrod

Affiliations

Soon will be listed here.

Abstract

Hyaluronate is taken up and metabolized in liver endothelial cells by means of a receptor. To characterize the interaction with the receptor, two preparations of 3H-labelled hyaluronate, of Mr 4 X 10(5) and 6.4 X 10(6), and a series of hyaluronate oligosaccharides were bound to cultured liver endothelial cells at 7 degrees C. The dissociation constant varied between 4.6 X 10(-6) M for an octasaccharide and 9 X 10(-12) M for the largest polymer. The Mr-dependence for the series of oligosaccharides was explained by the increased probability of binding due to the repetitive sequence along the chain. The high affinity of high-Mr hyaluronate for the receptor could also be mainly ascribed to this effect, which rules out any major contribution of co-operative multiple-site attachment to the cell surface. Each liver endothelial cell can bind 10(5) oligosaccharides, about 10(4) molecules with Mr 4 X 10(5) and about 10(3) molecules with Mr 6.4 X 10(6). This is explained by mutual exclusion of large molecules from the cell surface. Chondroitin sulphate is also bound to liver endothelial cells. Inhibition studies showed that it binds to the same receptor as hyaluronate and with an affinity that is about 3-fold higher than that of hyaluronate of the same degree of polymerization.

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