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2015 ; 146
(1
): 81-8
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Exogenous interleukin-33 targets myeloid-derived suppressor cells and generates
periphery-induced Foxp3? regulatory T cells in skin-transplanted mice
#MMPMID25988395
Gajardo T
; Morales RA
; Campos-Mora M
; Campos-Acuña J
; Pino-Lagos K
Immunology
2015[Sep]; 146
(1
): 81-8
PMID25988395
show ga
Interleukin-33 (IL-33) has been a focus of study because of its variety of
functions shaping CD4(+) T-cell biology. In the present work, we evaluated the
modulatory effect of IL-33 on suppressor cells in an in vivo transplantation
model. C57BL/6 wild-type mice were grafted with syngeneic or allogeneic skin
transplants and treated with exogenous IL-33 daily. After 10 days of treatment,
we analysed draining lymph node cellularity and found in allogeneic animals an
increment in myeloid-derived suppressor cells, which co-express MHC-II, and
become enriched upon IL-33 treatment. In line with this observation, inducible
nitric oxide synthase and arginase 1 expression were also increased in allogeneic
animals upon IL-33 administration. In addition, IL-33 treatment up-regulated the
number of Foxp3(+) regulatory T (Treg) cells in the allogeneic group,
complementing the healthier integrity of the allografts and the increased
allograft survival. Moreover, we demonstrate that IL-33 promotes CD4(+) T-cell
expansion and conversion of CD4(+) Foxp3(-) T cells into CD4(+) Foxp3(+) Treg
cells in the periphery. Lastly, the cytokine pattern of ex vivo-stimulated
draining lymph nodes indicates that IL-33 dampens interferon-? and IL-17
production, stimulating IL-10 secretion. Altogether, our work complements
previous studies on the immune-modulatory activity of IL-33, showing that this
cytokine affects myeloid-derived suppressor cells at the cell number and gene
expression levels. More importantly, our research demonstrates for the first time
that IL-33 allows for in vivo Foxp3(+) Treg cell conversion and favours an
anti-inflammatory or tolerogenic state by skewing cytokine production. Therefore,
our data suggest a potential use of IL-33 to prevent allograft rejection,
bringing new therapeutics to the transplantation field.
|*Skin Transplantation
[MESH]
|Animals
[MESH]
|Arginase/biosynthesis
[MESH]
|Cell Differentiation/immunology
[MESH]
|Cell Proliferation
[MESH]
|Forkhead Transcription Factors/immunology
[MESH]
|Graft Rejection/*immunology
[MESH]
|Graft Survival/*immunology
[MESH]
|Histocompatibility Antigens Class II/biosynthesis
[MESH]
|Immune Tolerance/drug effects/immunology
[MESH]
|Interferon-gamma/biosynthesis
[MESH]
|Interleukin-10/biosynthesis/metabolism
[MESH]
|Interleukin-17/biosynthesis
[MESH]
|Interleukin-33
[MESH]
|Interleukins/*pharmacology
[MESH]
|Lymphocyte Activation/immunology
[MESH]
|Mice
[MESH]
|Mice, Inbred C57BL
[MESH]
|Myeloid Cells/immunology
[MESH]
|Nitric Oxide Synthase Type II/biosynthesis
[MESH]