title: Regulatory B cells as inhibitors of immune responses and inflammation.
abstract: B cells positively regulate immune responses through antibody production and optimal CD4(+) T-cell activation. However, a specific and functionally important subset of B cells can also negatively regulate immune responses in mouse autoimmunity and inflammation models. The lack or loss of regulatory B cells has been demonstrated by exacerbated symptoms in experimental autoimmune encephalitis, chronic colitis, contact hypersensitivity, collagen-induced arthritis, and non-obese diabetic mouse models. Accumulating evidence suggests that B cells exert their regulatory role through the production of interleukin-10 (IL-10) by either B-1, marginal zone (MZ), or transitional 2-MZ precursor B-cell subsets. We have recently found that IL-10-producing regulatory B cells predominantly localize within a rare CD1d(hi)CD5(+) B-cell subset that shares cell surface markers with both B-1 and MZ B cells. We have labeled this specific subset of regulatory B cells as B10 cells to highlight that these rare CD1d(hi)CD5(+) B cells only produce IL-10 and are responsible for most IL-10 production by B cells and to distinguish them from other regulatory B-cell subsets that may also exist. This review focuses on the recent progress in this field and the exciting opportunities for understanding how this unique B-cell subset influences diverse immune functions.
authors.affiliation: Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA.
authors.forename: Jean-David
authors.initials: JD
authors.lastname: Bouaziz
authors.forename: Koichi
authors.initials: K
authors.lastname: Yanaba
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Tedder