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2015 ; 19
(6
): 1223-33
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gab.com Text
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PD-1/PD-L1 expression on CD(4+) T cells and myeloid DCs correlates with the
immune pathogenesis of atrial fibrillation
#MMPMID25810125
Liu L
; Zheng Q
; Lee J
; Ma Z
; Zhu Q
; Wang Z
J Cell Mol Med
2015[Jun]; 19
(6
): 1223-33
PMID25810125
show ga
Although immuno-inflammatory response contributes to pathogenesis of AF,
molecular and cellular mechanism in this process remains poorly understood.
Recently, increasing evidence suggests that Programmed death-1 (PD-1)/PD-1 ligand
(PD-L) pathway may be a potential pathway participating in AF pathogenesis. In
this study, we detected the PD-1 and PD-L1, 2 expression on peripheral blood
function cells by flow cytometry in 91 atrial fibrillation (AF) patients and 35
healthy volunteers. The expression of PD-1 on CD(4+) T cells and PD-L1 on myeloid
dendritic cells (mDCs) in AF patients is significantly down-regulated compared
with healthy volunteers. In addition, the extent of PD-1/PD-L1 down-regulation is
closely related with AF burden. More importantly, Allogeneic mixed leukocyte
reactions (MLR) shows that the mDCs PD-L1 down-regulation is associated with
increased T cell (CD(4+) and CD(8+)) proliferation, increased type 1 effector
cytokines (IL-2 and IFN-?) secretion, and decreased type 2 effector cytokine
(IL-10) secretion. Then, PD-L1 up-regulation by the stimulation of IFN-? can
significantly convert this representation. Collectively, our report suggest that
T(CD(4+))/mDCs-associated PD-1/PD-L1 pathway plays a key role in AF immune
regulation. PD-1/PD-L1 down-regulation in AF patients promotes T cells function
and may contribute to AF pathogenesis.