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2017 ; 95
(8
): 716-728
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Restimulation-induced T-cell death through NTB-A/SAP signaling pathway is
impaired in tuberculosis patients with depressed immune responses
#MMPMID28546549
Hernández Del Pino RE
; Pellegrini JM
; Rovetta AI
; Peña D
; Álvarez GI
; Rolandelli A
; Musella RM
; Palmero DJ
; Malbran A
; Pasquinelli V
; García VE
Immunol Cell Biol
2017[Sep]; 95
(8
): 716-728
PMID28546549
show ga
Production of IFN-? contributes to host defense against Mycobacterium
tuberculosis (Mtb) infection. We previously demonstrated that Signaling
lymphocytic activation molecule-associated protein (SAP) expression on cells from
tuberculosis (TB) patients was inversely correlated with IFN-? production. Here
we first investigated the role of NK, T- and B-cell antigen (NTB-A)/SAP pathway
in the regulation of Th1 response against Mtb. Upon antigen stimulation, NTB-A
phosphorylation rapidly increases and afterwards modulates IFN-? and IL-17
secretion. To sustain a healthy immune system, controlled expansion and
contraction of lymphocytes, both during and after an adaptive immune response, is
essential. Besides, restimulation-induced cell death (RICD) results in an
essential homeostatic mechanism for precluding excess T-cell accumulation and
associated immunopathology during the course of certain infections. Accordingly,
we found that the NTB-A/SAP pathway was required for RICD during active
tuberculosis. In low responder (LR) TB patients, impaired RICD was associated
with diminished FASL levels, IL-2 production and CD25(high) expression after
cell-restimulation. Interestingly, we next observed that SAP mediated the
recruitment of the Src-related kinase FYNT, only in T cells from LR TB patients
that were resistant to RICD. Together, we showed that the NTB-A/SAP pathway
regulates T-cell activation and RICD during human TB. Moreover, the
NTB-A/SAP/FYNT axis promotes polarization to an unfavorable Th2-phenotype.