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Physiological up-regulation of inhibitory receptors Fc gamma RII and CR1 on memory B cells is lacking in SLE patients.

Abstract：

:Under physiological conditions immune complexes (IC) are efficiently cleared from the circulation and meanwhile provide important feedback signals for the immune system via Fc gamma Rs and complement receptors. Dysregulation of these mechanisms have been implicated in conditions where IC concentrations reach pathological levels and inflict diseases, like systemic lupus erythematosus (SLE). Our aim was to compare distinct sub-populations of CD19(+) B cells of healthy individuals and SLE patients with regard to their expression of Fc gamma R type II (Fc gamma RII, CD32), complement receptor type 1 (CR1, CD35) and complement receptor type 2 (CR2, CD21) and sIgG/IgM. The following four groups of peripheral CD19(+) B cells were investigated: IgM(+)/CD27(-) naive, IgM(+)/CD27(+) and IgM(-)/CD27(+) memory cells and CD27(high) plasmablasts. We demonstrate that the expression of the inhibitory receptors Fc gamma RII and CR1 is up-regulated on peripheral memory B cells of healthy controls, whereas this up-regulation is considerably impaired on the memory B cells of SLE patients. This reduction affects both the IgM(+) and switched memory B cells. We found a striking difference between the expression of complement receptors CD21 and CD35; namely, no up-regulation of CD21 occurred on the memory B cells of healthy donors, and its decreased expression in SLE patients was characteristic for both the CD27(-) naive and the CD27(+) memory B-cell populations. Our results clearly demonstrate that the previously reported reduced expression of IC-binding receptors is mainly due to the disturbed memory compartment; however, the higher frequency of CD19(+)/CD27(high)/sIg(low) plasmablasts expressing minimal levels of these receptors also contributes to this diminution.

journal_name

Int Immunol

journal_title

International immunology

authors

Isaák A,Gergely P Jr,Szekeres Z,Prechl J,Poór G,Erdei A,Gergely J

doi

10.1093/intimm/dxm132

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

185-92

issue

2

eissn

0953-8178

issn

1460-2377

pii

dxm132

journal_volume

20

pub_type

杂志文章

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