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2015 ; 6
(ä): 7139
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Microbe-dependent lymphatic migration of neutrophils modulates lymphocyte
proliferation in lymph nodes
#MMPMID25972253
Hampton HR
; Bailey J
; Tomura M
; Brink R
; Chtanova T
Nat Commun
2015[May]; 6
(ä): 7139
PMID25972253
show ga
Neutrophil recruitment to the site of injury is an essential first step of an
anti-bacterial response. However, little is known about the basis for and
relevance of neutrophil migration from inflamed tissue into lymphoid organs. We
established a photoconversion-based system to monitor the fate of neutrophils
recruited to inflamed skin. While neutrophils are efficiently recruited to sites
of both microbial and sterile lesions, subsequent re-localization to draining
lymph nodes happens only when bacteria are present in the primary lesion. Skin
egress of neutrophils occurs via lymphatic vessels and is dependent on CD11b and
CXCR4 but not CCR7. Neutrophils are the predominant immune cell to migrate from
inflamed skin into lymph nodes where they augment lymphocyte proliferation.
Furthermore, inhibition of neutrophil migration from skin reduces T-cell
proliferation in draining lymph nodes. Thus neutrophils mediate rapid cellular
communication between the initial injury site and secondary lymphoid organs and
modulate immune responsiveness.