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2015 ; 17
(1
): 185
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Epratuzumab inhibits the production of the proinflammatory cytokines IL-6 and
TNF-?, but not the regulatory cytokine IL-10, by B cells from healthy donors and
SLE patients
#MMPMID26183319
Fleischer V
; Sieber J
; Fleischer SJ
; Shock A
; Heine G
; Daridon C
; Dörner T
Arthritis Res Ther
2015[Jul]; 17
(1
): 185
PMID26183319
show ga
INTRODUCTION: Cytokines produced by B cells are believed to play important roles
in autoimmune diseases. CD22 targeting by epratuzumab has been demonstrated to
inhibit phosphorylation of B cell receptor (BCR) downstream signaling in B cells.
It has been shown that other sialoadhesin molecules related to CD22 have
immunoregulatory functions; therefore, in the present study, we addressed the
role of epratuzumab on the production of key cytokines by B cells of patients
with systemic lupus erythematosus (SLE) and of healthy donors (HD). METHODS:
Peripheral blood B cells were purified and activated by BCR with or without
Toll-like receptor 9 (TLR9) stimulation in the presence or absence of
epratuzumab. Cytokine production by B cells (interleukin [IL]-6, tumor necrosis
factor [TNF]-? and IL-10) in the supernatant and the induction of IL-10(+) B
cells from patients with SLE and HD were analyzed. RESULTS: The secretion of the
proinflammatory cytokines TNF-? and IL-6 by anti-BCR and BCR- and/or
TLR9-activated B cells from HD and patients with SLE was inhibited by
epratuzumab. In contrast, the production of IL-10 by B cells was not affected by
epratuzumab under either stimulation condition. Consistently, the induction of
IL-10-producing B cells in culture was not affected by epratuzumab. CONCLUSIONS:
Epratuzumab, by targeting CD22, was able to inhibit the production of the
proinflammatory cytokines IL-6 and TNF-? by B cells, in contrast to IL-10, in
vitro. These data suggest that targeting CD22 alters the balance between
proinflammatory cytokines (TNF-?, IL-6) and the regulatory cytokine IL-10 as
another B cell effector mechanism.