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2017 ; 7
(1
): 1288
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NKG2D(+)CD4(+) T Cells Kill Regulatory T Cells in a NKG2D-NKG2D Ligand- Dependent
Manner in Systemic Lupus Erythematosus
#MMPMID28455530
Yang D
; Tian Z
; Zhang M
; Yang W
; Tang J
; Wu Y
; Ni B
Sci Rep
2017[Apr]; 7
(1
): 1288
PMID28455530
show ga
Systemic lupus erythematosus (SLE) features a decreased pool of
CD4(+)CD25(+)Foxp3(+) T regulatory (Treg) cells. We had previously observed
NKG2D(+)CD4(+) T cell expansion in contrast to a decreased pool of Treg cells in
SLE patients, but whether NKG2D(+)CD4(+) T cells contribute to the decreased Treg
cells remains unclear. In the present study, we found that the NKG2D(+)CD4(+) T
cells efficiently killed NKG2D ligand (NKG2DL)(+) Treg cells in vitro, whereby
the surviving Treg cells in SLE patients showed no detectable expression of
NKG2DLs. It was further found that MRL/lpr lupus mice have significantly
increased percentage of NKG2D(+)CD4(+) T cells and obvious decreased percentage
of Treg cells, as compared with wild-type mice. Adoptively transferred NKG2DL(+)
Treg cells were found to be efficiently killed in MRL/lpr lupus mice, with NKG2D
neutralization remarkably attenuating this killing. Anti-NKG2D or
anti-interferon-alpha receptor (IFNAR) antibodies treatment in MRL/lpr mice
restored Treg cells numbers and markedly ameliorated the lupus disease. These
results suggest that NKG2D(+)CD4(+) T cells are involved in the pathogenesis of
SLE by killing Treg cells in a NKG2D-NKG2DL-dependent manner. Targeting the
NKG2D-NKG2DL interaction might be a potential therapeutic strategy by which Treg
cells can be protected from cytolysis in SLE patients.