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2017 ; 8
(ä): 1068
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CXCL12 Mediates Aberrant Costimulation of B Lymphocytes in Warts,
Hypogammaglobulinemia, Infections, Myelokathexis Immunodeficiency
#MMPMID28928741
Roselli G
; Martini E
; Lougaris V
; Badolato R
; Viola A
; Kallikourdis M
Front Immunol
2017[]; 8
(ä): 1068
PMID28928741
show ga
The Warts, Hypogammaglobulinemia, Infections, Myelokathexis (WHIM) syndrome is an
immunodeficiency caused by mutations in chemokine receptor CXCR4. WHIM patient
adaptive immunity defects remain largely unexplained. We have previously shown
that WHIM-mutant T cells form unstable immunological synapses, affecting T cell
activation. Here, we show that, in WHIM patients and WHIM CXCR4 knock-in mice, B
cells are more apoptosis prone. Intriguingly, WHIM-mutant B cells were also
characterized by spontaneous activation. Searching for a mechanistic explanation
for these observations, we uncovered a novel costimulatory effect of CXCL12, the
CXCR4 ligand, on WHIM-mutant but not wild-type B cells. The WHIM CXCR4-mediated
costimulation led to increased B-cell activation, possibly involving mTOR, albeit
without concurrently promoting survival. A reduction in antigenic load during
immunization in the mouse was able to circumvent the adaptive immunity defects.
These results suggest that WHIM-mutant CXCR4 may lead to spontaneous aberrant
B-cell activation, via CXCL12-mediated costimulation, impairing B-cell survival
and thus possibly contributing to the WHIM syndrome defects in adaptive immunity.