Format

Send to

Choose Destination
J Immunol. 2015 Jul 15;195(2):488-97. doi: 10.4049/jimmunol.1403225. Epub 2015 Jun 8.

Tr1 Cells, but Not Foxp3+ Regulatory T Cells, Suppress NLRP3 Inflammasome Activation via an IL-10-Dependent Mechanism.

Author information

1
Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada V5Z 1M9; Vancouver Coastal Health Research Institute, Vancouver, British Columbia, Canada V6X 3Z6; Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada V5Z 1M9; Child and Family Research Institute, Vancouver, British Columbia, Canada V5Z 4H4;
2
Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada V5Z 1M9; Child and Family Research Institute, Vancouver, British Columbia, Canada V5Z 4H4;
3
Department of Pediatrics, University of California, San Diego, San Diego, CA 92161;
4
Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada V5Z 1M9; Vancouver Coastal Health Research Institute, Vancouver, British Columbia, Canada V6X 3Z6;
5
Department of Pediatrics, University of California, San Diego, San Diego, CA 92161; Rady Children's Hospital, University of California, San Diego, San Diego, CA 92093.
6
Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada V5Z 1M9; Child and Family Research Institute, Vancouver, British Columbia, Canada V5Z 4H4; mlevings@mail.ubc.ca.

Abstract

The two best-characterized types of CD4(+) regulatory T cells (Tregs) are Foxp3(+) Tregs and Foxp3(-) type 1 regulatory (Tr1) cells. The ability of Foxp3(+) Tregs and Tr1 cells to suppress adaptive immune responses is well known, but how these cells regulate innate immunity is less defined. We discovered that CD44(hi)Foxp3(-) T cells from unmanipulated mice are enriched in Tr1 cell precursors, enabling differentiation of cells that express IL-10, as well as Tr1-associated cell surface markers, CD49b and LAG-3, and transcription factors, cMaf, Blimp-1, and AhR. We compared the ability of Tr1 cells versus Foxp3(+) Tregs to suppress IL-1β production from macrophages following LPS and ATP stimulation. Surprisingly, Tr1 cells, but not Foxp3(+) Tregs, inhibited the transcription of pro-IL-1β mRNA, inflammasome-mediated activation of caspase-1, and secretion of mature IL-1β. Consistent with the role for IL-10 in Tr1 cell-mediated suppression, inhibition of inflammasome activation and IL-1β secretion was abrogated in IL-10R-deficient macrophages. Moreover, IL-1β production from macrophages derived from Nlrp3(A350V) knockin mice, which carry a mutation found in cryopyrin-associated periodic syndrome patients, was suppressed by Tr1 cells but not Foxp3(+) Tregs. Using an adoptive transfer model, we found a direct correlation between Tr1 cell engraftment and protection from weight loss in mice expressing a gain-of-function NLRP3. Collectively, these data provide the first evidence for a differential role of Tr1 cells and Foxp3(+) Tregs in regulating innate immune responses. Through their capacity to produce high amounts of IL-10, Tr1 cells may have unique therapeutic effects in disease-associated inflammasome activation.

PMID:
26056255
DOI:
10.4049/jimmunol.1403225
[Indexed for MEDLINE]
Free full text

Publication type, MeSH terms, Substances, Grant support

Publication type

MeSH terms

Substances

Grant support

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center