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2018 ; 9
(ä): 787
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
SYK Inhibition Induces Apoptosis in Germinal Center-Like B Cells by Modulating
the Antiapoptotic Protein Myeloid Cell Leukemia-1, Affecting B-Cell Activation
and Antibody Production
#MMPMID29740433
Roders N
; Herr F
; Ambroise G
; Thaunat O
; Portier A
; Vazquez A
; Durrbach A
Front Immunol
2018[]; 9
(ä): 787
PMID29740433
show ga
B cells play a major role in the antibody-mediated rejection (AMR) of solid organ
transplants, a major public health concern. The germinal center (GC) is involved
in the generation of donor-specific antibody-producing plasma cells and memory B
cells, which are often poorly controlled by current treatments. Myeloid cell
leukemia-1 (Mcl-1), an antiapoptotic member of the B-cell lymphoma-2 family, is
essential for maintenance of the GC reaction and B-cell differentiation. During
chronic AMR (cAMR), tertiary lymphoid structures resembling GCs appear in the
rejected organ, suggesting local lymphoid neogenesis. We report the infiltration
of the kidneys with B cells expressing Mcl-1 in patients with cAMR. We modulated
GC viability by impairing B-cell receptor signaling, by spleen tyrosine kinase
(SYK) inhibition. SYK inhibition lowers viability and Mcl-1 protein levels in
Burkitt's lymphoma cell lines. This downregulation of Mcl-1 is coordinated at the
transcriptional level, possibly by signal transducer and activator of
transcription 3 (STAT3), as shown by (1) the impaired translocation of STAT3 to
the nucleus following SYK inhibition, and (2) the lower levels of Mcl-1
transcription upon STAT3 inhibition. Mcl-1 overproduction prevented cells from
entering apoptosis following SYK inhibition. In vitro studies with primary
tonsillar B cells confirmed that SYK inhibition impaired cell survival and
decreased Mcl-1 protein levels. It also impaired B-cell activation and
immunoglobulin G secretion by tonsillar B cells. These findings suggest that the
SYK-Mcl-1 pathway could be targeted, to improve graft survival by manipulating
the humoral immune response.