B cells are characterized by their specific ability to produce antibodies. Therefore, the antibody-mediated immune responses are the major mechanism played by B cells. Indeed, as compared to T cells, B cells have not typically been considered to be a major source of cytokines. However, it is evident that B cells can also produce a wide spectrum of cytokines particularly under inflammatory conditions. We have identified inducible B cell subset that develops in response to inflammation and contributes to the improvement of ongoing inflammation through the production of cytokines. The cytokine-producing, inducible regulatory B cells termed """"""""iBreg"""""""" possess the ability to not only control inflammatory immune responses but also inhibit atherosclerosis and tumor immunity. These findings suggest the coexistence of effector and regulatory B cells in several pathophysiological conditions. The long-term objective of this project is to identify the mechanism leading to iBreg development in order to provide a rationale in utilizing iBreg to improve several health problems. Our preliminary study has identified a previously unidentified unique IgM+ MHC class IIbright B cell population that resides in normal large intestine and expands markedly in response to inflammation. The unique B cells were recruited from immature transitional and recirculating naive B2 cell pools and could expand without differentiation into plasma cells. Interestingly, they developed both in antigen-independent manner and in SLPI (secretory leukocyte protease inhibitor) and BAFF (receptor of B cell activation factor from the TNF family)-dependent manners. These unique B cells shared some phenotypic and functional features with iBreg that has previously been shown to develop in mesenteric lymph nodes (MLN) only under inflammatory condition. Based on these data, we hypothesize that the unique intestinal B cells represent a precursor of iBreg, which differentiates from immature/naive B cells in the large intestine in the presence of SLPI (for inhibition of canonical NFkB pathway, NFkB1) and BAFF (for activation of alternative NFkB pathway, NF:B2) and then homes into MLN where their immune regulatory function is fully elicited. This grant application aims at investigating why MHC class IIbright B cells specifically expand in the contest of inflammation, how they develop, whether they represent an immediate precursor of iBreg, and how immune regulatory ability of MHC class IIbright B cell-derived iBreg is elicited.

Public Health Relevance

Biological responses in our bodies are controlled by the interactions of many different cell types to suppress the development of undesirable health conditions (1). We have recently identified a novel cell subset termed iBreg, which is specifically induced under inflammatory conditions and is capable of improving the disease (2-4). This project aims at dissecting the mechanism involved in the development of iBreg. We believe that the study proposed would provide important intervention to develop a novel immune therapy for resolving diverse health problems, including infection, autoimmune diseases, cancer, and atherosclerosis.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI081807-03
Application #
8414890
Study Section
Cellular and Molecular Immunology - B Study Section (CMIB)
Program Officer
Ferguson, Stacy E
Project Start
2010-12-01
Project End
2015-11-30
Budget Start
2012-12-01
Budget End
2013-11-30
Support Year
3
Fiscal Year
2013
Total Cost
$359,825
Indirect Cost
$148,325
Name
Massachusetts General Hospital
Department
Type
DUNS #
073130411
City
Boston
State
MA
Country
United States
Zip Code
02199
Kim, Young-In; Song, Joo-Hye; Ko, Hyun-Jeong et al. (2018) CX3CR1+ Macrophages and CD8+ T Cells Control Intestinal IgA Production. J Immunol 201:1287-1294
Maldonado-Contreras, Ana; Birtley, James R; Boll, Erik et al. (2017) Shigella depends on SepA to destabilize the intestinal epithelial integrity via cofilin activation. Gut Microbes 8:544-560
Subramaniam, Renuka; Mizoguchi, Atsushi; Mizoguchi, Emiko (2016) Mechanistic roles of epithelial and immune cell signaling during the development of colitis-associated cancer. Cancer Res Front 2:1-21
DeGruttola, Arianna K; Low, Daren; Mizoguchi, Atsushi et al. (2016) Current Understanding of Dysbiosis in Disease in Human and Animal Models. Inflamm Bowel Dis 22:1137-50
Li, Yang; Basavappa, Megha; Lu, Jinfeng et al. (2016) Induction and suppression of antiviral RNA interference by influenza A virus in mammalian cells. Nat Microbiol 2:16250
Legarda, Diana; Justus, Scott J; Ang, Rosalind L et al. (2016) CYLD Proteolysis Protects Macrophages from TNF-Mediated Auto-necroptosis Induced by LPS and Licensed by Type I IFN. Cell Rep 15:2449-61
Low, Daren; DeGruttola, Arianna K; Poltrak, Alexander et al. (2015) High Endogenous Expression of Chitinase 3-Like 1 and Excessive Epithelial Proliferation with Colonic Tumor Formation in MOLF/EiJ Mice. PLoS One 10:e0139149
Low, Daren; Subramaniam, Renuka; Lin, Li et al. (2015) Chitinase 3-like 1 induces survival and proliferation of intestinal epithelial cells during chronic inflammation and colitis-associated cancer by regulating S100A9. Oncotarget 6:36535-50
Nishida, Atsushi; Lau, Cindy W; Mizoguchi, Atsushi (2015) Examination of the role of galectins in intestinal inflammation. Methods Mol Biol 1207:231-48
Nishida, Atsushi; Lau, Cindy W; Mizoguchi, Emiko et al. (2014) Regulatory B cells in mouse models of intestinal inflammation. Methods Mol Biol 1190:227-41

Showing the most recent 10 out of 20 publications