A Lysine-binding Protein in SLE Sera Inhibits the Binding of Immune Complexes to Normal Erythrocyte CR1 (complement Receptor Type 1)

Overview

Journal Clin Exp Immunol

Publisher Oxford University Press

Specialty Allergy & Immunology

Date 1987 Jul 1

PMID 3115654

Citations 4

Authors

Y C Ng

D K PETERS

S A Cederholm-Williams

M J Walport

Affiliations

Soon will be listed here.

Abstract

The binding of 125I-labelled immune complexes (IC) to normal human erythrocyte CR1 (complement receptor type 1) by sera from patients with SLE was found to be significantly decreased compared to normal sera. In 13/29 patients, there was an inhibitor which decreased the binding of opsonized IC in normal sera to normal erythrocytes. It was found in each of the nine patients who had clinically active disease. The inhibitor was shown to be a globulin that was labile at 56 degrees C and bound to lysine; low concentrations of tranexamic acid and of lysine abolished the effects of the inhibitor which suggests that it possesses lysine-binding sites: these may block the CR1-binding site on IC opsonized with complement. This inhibitor may decrease the efficiency of IC carriage by erythrocyte CR1.

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