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2018 ; 30
(1
): 23-33
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Rapid immunosurveillance by recirculating lymphocytes in the rat intestine:
critical role of unsulfated sialyl-Lewis X on high endothelial venules of the
Peyer s patches
#MMPMID29365122
Uchida T
; Ueta H
; Xu XD
; Hirakawa J
; Tahara K
; Zhou S
; Sawanobori Y
; Simmons S
; Kitazawa Y
; Kawashima H
; Matsuno K
Int Immunol
2018[Feb]; 30
(1
): 23-33
PMID29365122
show ga
Naive lymphocytes systemically recirculate for immunosurveillance inspecting
foreign antigens and pathogens in the body. Trafficking behavior such as the
migration pathway and transit time within the gastrointestinal tract, however,
remains to be elucidated. Rat thoracic duct lymphocytes (TDLs) were transferred
to a congeneic host that had undergone mesenteric lymphadenectomy. The migration
pathway was investigated using newly developed four-color immunohistochemistry
and immunofluorescence. Donor TDLs showed rapid transition in gut tissues from
which they emerged in mesenteric lymph around 4 h after intravenous injection.
Immunohistochemistry showed that donor TDLs predominantly transmigrated across
high endothelial venules (HEVs) at the interfollicular area of the Peyer's
patches (PPs), then exited into the LYVE-1+ efferent lymphatics, that were close
to the venules. The rapid recirculation depended largely on the local expression
of unsulfated sialyl-Lewis X on these venules where putative dendritic cells
(DCs) were associated underneath. Recruited naive T cells briefly made contact
with resident DCs before exiting to the lymphatics in the steady state. In some
transplant settings, however, the T cells retained contact with DCs and were
sensitized and differentiated into activated T cells. In conclusion, we directly
demonstrated that lymphocyte recirculation within the gut is a very rapid
process. The interfollicular area of PPs functions as a strategically central
site for rapid immunosurveillance where HEVs, efferent lymphatics and resident
DCs converge. PPs can, however, generate alloreactive T cells, leading to
exacerbation of graft-versus-host disease or gut allograft rejection.