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2014 ; 192
(7
): 3374-82
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Central role of conventional dendritic cells in regulation of bone marrow release
and survival of neutrophils
#MMPMID24591364
Jiao J
; Dragomir AC
; Kocabayoglu P
; Rahman AH
; Chow A
; Hashimoto D
; Leboeuf M
; Kraus T
; Moran T
; Carrasco-Avino G
; Friedman SL
; Merad M
; Aloman C
J Immunol
2014[Apr]; 192
(7
): 3374-82
PMID24591364
show ga
Neutrophils are the most abundant cell type in the immune system and play an
important role in the innate immune response. Using a diverse range of mouse
models with either defective dendritic cell (DC) development or conditional DC
depletion, we provide in vivo evidence indicating that conventional DCs play an
important role in the regulation of neutrophil homeostasis. Flk2, Flt3L, and
Batf3 knockout mice, which have defects in DC development, have increased numbers
of liver neutrophils in the steady state. Conversely, neutrophil frequency is
reduced in DC-specific PTEN knockout mice, which have an expansion of CD8(+) and
CD103(+) DCs. In chimeric CD11c-DTR mice, conventional DC depletion results in a
systemic increase of neutrophils in peripheral organs in the absence of
histological inflammation or an increase in proinflammatory cytokines. This
effect is also present in splenectomized chimeric CD11c-DTR mice and is absent in
chimeric mice with 50% normal bone marrow. In chimeric CD11c-DTR mice, diphtheria
toxin treatment results in enhanced neutrophil trafficking from the bone marrow
into circulation and increased neutrophil recruitment. Moreover, there is an
increased expression of chemokines/cytokines involved in neutrophil homeostasis
and reduced neutrophil apoptosis. These data underscore the role of the DC pool
in regulating the neutrophil compartment in nonlymphoid organs.