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2013 ; 17
(6
): R284
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English Wikipedia
Galectin-9 prolongs the survival of septic mice by expanding Tim-3-expressing
natural killer T cells and PDCA-1+ CD11c+ macrophages
#MMPMID24321251
Kadowaki T
; Morishita A
; Niki T
; Hara J
; Sato M
; Tani J
; Miyoshi H
; Yoneyama H
; Masaki T
; Hattori T
; Matsukawa A
; Hirashima M
Crit Care
2013[Dec]; 17
(6
): R284
PMID24321251
show ga
INTRODUCTION: Galectin-9 ameliorates various inflammatory conditions including
autoimmune diseases by regulating T cell and macrophage/dendritic cell (DC)
functions. However, the effect of galectin-9 on polymicrobial sepsis has not been
assessed. METHODS: We induced polymicrobial sepsis by cecal ligation and puncture
(CLP) in mice. The survival rate was compared between galectin-9- and PBS-treated
CLP mice. An ELISA was used to compare the levels of various cytokines in the
plasma and culture supernatants. Fluorescence-activated cell sorting analysis was
further performed to compare the frequencies of subpopulations of spleen cells.
RESULTS: Galectin-9 exhibited a protective effect in polymicrobial sepsis as
demonstrated in galetin-9 transgenic mice and therapeutic galectin-9
administration. In contrast, such effect was not observed in nude mice,
indicating the involvement of T cells in galectin-9-mediated survival
prolongation. Galectin-9 decreased TNF?, IL-6, IL-10 and, high mobility group box
1 (HMGB1) and increased IL-15 and IL-17 plasma and spleen levels. Galectin-9
increased the frequencies of natural killer T (NKT) cells and PDCA-1+ CD11c+
macrophages (pDC-like macrophages) but did not change the frequency of CD4 or CD8
T cells, ??T cells or conventional DC. As expected, galectin-9 decreased the
frequency of Tim-3+ CD4 T cells, most likely Th1 and Th17 cells. Intriguingly,
many spleen NK1.1+ NKT cells and pDC-like macrophages expressed Tim-3. Galectin-9
increased the frequency of Tim-3-expressing NK1.1+ NKT cells and pDC-like
macrophages. Galectin-9 further increased IL-17+ NK1.1+ NKT cells. CONCLUSION:
These data suggest that galectin-9 exerts therapeutic effects on polymicrobial
sepsis, possibly by expanding NKT cells and pDC-like macrophages and by
modulating the production of early and late proinflammatory cytokines.