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2017 ; 187
(3
): 441-454
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Decreased frequencies and impaired functions of the CD31(+) subpopulation in
T(reg) cells associated with decreased FoxP3 expression and enhanced T(reg) cell
defects in patients with coronary heart disease
#MMPMID27997991
Huang L
; Zheng Y
; Yuan X
; Ma Y
; Xie G
; Wang W
; Chen H
; Shen L
Clin Exp Immunol
2017[Mar]; 187
(3
): 441-454
PMID27997991
show ga
Coronary heart disease (CHD) is one of the most common types of organ lesions
caused by atherosclerosis, in which CD4(+) CD25(+) forkhead box protein 3
(FoxP3(+) ) regulatory T cells (T(reg) ) play an atheroprotective role. However,
T(reg) cell numbers are decreased and their functions are impaired in
atherosclerosis; the underlying mechanisms remain unclear. CD31 plays an
important part in T cell response and contributes to maintaining T cell
tolerance. The immunomodulatory effects of CD31 are also implicated in
atherosclerosis. In this study, we found that decreased frequencies of the
CD31(+) subpopulation in T(reg) cells (CD31(+) Tr cells) correlated positively
with decreased FoxP3 expression in CHD patients. Cell culture in vitro
demonstrated CD31(+) Tr cells maintaining stable FoxP3 expression after
activation and exhibited enhanced proliferation and immunosuppression compared
with the CD31(-) subpopulation in T(reg) cells (CD31(-) Tr cells). We also
confirmed impaired secretion of transforming growth factor (TGF)-?1 and
interleukin (IL)-10 in CD31(+) Tr cells of CHD patients. Further analysis
revealed reduced phospho-SHP2 (associated with CD31 activation) and
phospho-signal transducer and activator of transcription-5 (STAT-5) (associated
with FoxP3 transcription) levels in CD31(+) Tr cells of CHD patients, suggesting
that decreased FoxP3 expression in CD31(+) Tr cells might be because of
attenuated SHP2 and STAT-5 activation. These data indicate that decreased
frequencies and impaired functions of the CD31(+) Tr subpopulation associated
with decreased FoxP3 expression give rise, at least in part, to T(reg) cell
defects in CHD patients. Our findings emphasize the important role of the CD31(+)
Tr subpopulation in maintaining T(reg) cell normal function and may provide a
novel explanation for impaired immunoregulation of T(reg) cells in CHD.