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2017 ; 151
(3
): 280-290
Nephropedia Template TP
Mao L
; Hou H
; Wu S
; Zhou Y
; Wang J
; Yu J
; Wu X
; Lu Y
; Mao L
; Bosco MJ
; Wang F
; Sun Z
Immunology
2017[Jul]; 151
(3
): 280-290
PMID28108989
show ga
B-lymphocyte hyperactivity in systemic lupus erythematosus (SLE) is
T-cell-dependent, and CD4(+) T-cell activation is essential to SLE pathogenesis.
However, the mechanism of the deregulation of CD4(+) T cells in SLE is largely
unknown. T-cell immunoglobulin and ITIM domain (TIGIT) is a new inhibitory
receptor preferentially expressed on activated CD4(+) T cells. Here, we address
the role of TIGIT in the pathogenesis of SLE. Our results showed that TIGIT
expression on CD4(+) T cells was significantly elevated in patients with SLE and
highly correlated with the activity of the disease. TIGIT(+) CD4(+) T cells from
both healthy individuals and patients with SLE had a more activated phenotype
than TIGIT(-) CD4(+) T cells. In contrast, the activation, proliferation and
cytokine production potential of TIGIT(+) CD4(+) T cells were significantly lower
than those of TIGIT(-) CD4(+) T cells. Furthermore, activation of the TIGIT
pathway by using CD155 could substantially down-regulate the activities of CD4(+)
T cells from SLE patients in vitro, and in vivo administration of CD155 resulted
in a delayed development of SLE in MRL/lpr mice. TIGIT is a powerful negative
regulator of CD4(+) T cells in SLE, which suggests that the TIGIT signalling
pathway may be used as a potential therapeutic target for treating this disease.