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2017 ; 129
(14
): 1991-2001
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Neutrophils acquire the capacity for antigen presentation to memory CD4(+) T
cells in vitro and ex vivo
#MMPMID28143882
Vono M
; Lin A
; Norrby-Teglund A
; Koup RA
; Liang F
; Loré K
Blood
2017[Apr]; 129
(14
): 1991-2001
PMID28143882
show ga
Neutrophils are critical cells of the innate immune system and rapidly respond to
tissue injury and infection. Increasing evidence also indicates that neutrophils
have versatile functions in contributing to adaptive immunity by internalizing
and transporting antigen and influencing antigen-specific responses. Here, we
demonstrate that freshly isolated human neutrophils can function as
antigen-presenting cells (APCs) to memory CD4(+) T cells. Neutrophils pulsed with
the cognate antigens cytomegalovirus pp65 or influenza hemagglutinin were able to
present the antigens to autologous antigen-specific CD4(+) T cells in a major
histocompatibility complex class II (MHC-II; HLA-DR)-dependent manner. Although
myeloid dendritic cells and monocytes showed superior presenting ability,
neutrophils consistently displayed antigen presentation capability. Upregulation
of HLA-DR on neutrophils required the presence of the antigen-specific or
activated T cells whereas exposure to innate stimuli such as Toll-like receptor
ligands was not sufficient. Neutrophils sorted from vaccine-draining lymph nodes
from rhesus macaques also showed expression of HLA-DR and were capable of
presenting vaccine antigen to autologous antigen-specific memory CD4(+) T cells
ex vivo. Altogether, the data demonstrate that neutrophils can adapt a function
as APCs and, in combination with their abundance in the immune system, may have a
significant role in regulating antigen-specific T-cell responses.