alexa A regulatory B cell subset with a unique CD1dhiCD5+ phenotype controls T cell-dependent inflammatory responses.
Neurology

Neurology

Journal of Multiple Sclerosis

Author(s): Yanaba K, Bouaziz JD, Haas KM, Poe JC, Fujimoto M,

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Abstract B cells mediate multiple functions that influence immune and inflammatory responses. In this study, T cell-mediated inflammation was exaggerated in CD19-deficient (Cd19(-/-)) mice and wild-type mice depleted of CD20(+) B cells, whereas inflammation was substantially reduced in mice with hyperactive B cells as a result of CD19 overexpression (hCD19Tg). These inflammatory responses were negatively regulated by a unique CD1d(hi)CD5(+) B cell subset that was absent in Cd19(-/-) mice, represented only 1\%-2\% of spleen B220(+) cells in wild-type mice, but was expanded to approximately 10\% of spleen B220(+) cells in hCD19Tg mice. Adoptive transfer of these CD1d(hi)CD5(+) B cells normalized inflammation in wild-type mice depleted of CD20(+) B cells and in Cd19(-/-) mice. Remarkably, IL-10 production was restricted to this CD1d(hi)CD5(+) B cell subset, with IL-10 production diminished in Cd19(-/-) mice, yet increased in hCD19Tg mice. Thereby, CD1d(hi)CD5(+) B cells represent a unique subset of potent regulatory B cells. This article was published in Immunity and referenced in Journal of Multiple Sclerosis

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