Bacterially activated B-cells drive T cell differentiation towards Tr1 through PD-1/PD-L1 expression

Molecular Immunology
Sawsan Sudqi SaidAyca Sayi-Yazgan

Abstract

Regulatory B cells (Bregs) play a crucial role in immunological tolerance primarily through the production of IL-10 in many diseases including autoimmune disorders, allergy, infectious diseases, and cancer. To date, various Breg subsets with overlapping phenotypes have been identified. However, the roles of Bregs in Helicobacter infection are largely unknown. In the present study, we investigate the phenotype and function of Helicobacter -stimulated B cells. Our results demonstrate that Helicobacter felis -stimulated IL-10- producing B cells (Hfstim- IL-10+ B) are composed of B10 and Transitional 2 Marginal Zone Precursor (T2-MZP) cells with expression of CD9, Tim-1, and programmed death 1 (PD-1). On the other hand, Helicobacter felis -stimulated IL-10- nonproducing B (Hfstim- IL-10- B) cells are mainly marginal zone (MZ) B cells that express PD-L1 and secrete TGF-β, IL-6, and TNF-α, and IgM and IgG2b. Furthermore, we show that both Hfstim- IL-10+ B cells and Hfstim- IL-10- B cells induce CD49b+LAG-3+ Tr1 cells. Here, we describe a novel mechanism for PD-1/PD-L1- driven B cell-dependent Tr1 cell differentiation. Finally, we explore the capability of Hfstim- IL-10- B cells to induce Th17 cell differentiation, which we find to be...Continue Reading

Citations

Jan 23, 2019·Journal of Cellular Physiology·Xi JiaJin-An Zhang
Oct 26, 2018·Frontiers in Immunology·Carole BrosseauSophie Brouard
Sep 6, 2019·Helicobacter·Armelle Ménard, Annemieke Smet
Sep 6, 2019·Helicobacter·Philippe Lehours, Richard L Ferrero
May 18, 2021·Frontiers in Immunology·Diego CatalánOctavio Aravena
Jun 29, 2021·Frontiers in Immunology·Ece Canan SayitogluMaria Grazia Roncarolo

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