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2015 ; 6
(ä): 496
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Systemic Sclerosis Patients Present Alterations in the Expression of Molecules
Involved in B-Cell Regulation
#MMPMID26483788
Soto L
; Ferrier A
; Aravena O
; Fonseca E
; Berendsen J
; Biere A
; Bueno D
; Ramos V
; Aguillón JC
; Catalán D
Front Immunol
2015[]; 6
(ä): 496
PMID26483788
show ga
The activation threshold of B cells is tightly regulated by an array of
inhibitory and activator receptors in such a way that disturbances in their
expression can lead to the appearance of autoimmunity. The aim of this study was
to evaluate the expression of activating and inhibitory molecules involved in the
modulation of B cell functions in transitional, naive, and memory B-cell
subpopulations from systemic sclerosis patients. To achieve this, blood samples
were drawn from 31 systemic sclerosis patients and 53 healthy individuals.
Surface expression of CD86, MHC II, CD19, CD21, CD40, CD22, Siglec 10, CD35, and
Fc?RIIB was determined by flow cytometry. IL-10 production was evaluated by
intracellular flow cytometry from isolated B cells. Soluble IL-6 and IL-10 levels
were measured by ELISA from supernatants of stimulated B cells. Systemic
sclerosis patients exhibit an increased frequency of transitional and naive B
cells related to memory B cells compared with healthy controls. Transitional and
naive B cells from patients express higher levels of CD86 and Fc?RIIB than
healthy donors. Also, B cells from patients show high expression of CD19 and
CD40, whereas memory cells from systemic sclerosis patients show reduced
expression of CD35. CD19 and CD35 expression levels associate with different
autoantibody profiles. IL-10(+) B cells and secreted levels of IL-10 were
markedly reduced in patients. In conclusion, systemic sclerosis patients show
alterations in the expression of molecules involved in B-cell regulation. These
abnormalities may be determinant in the B-cell hyperactivation observed in
systemic sclerosis.