Abstract
Immature autoreactive B cells are present in all healthy individuals, but it is unclear which signals are required for their maturation into antibody-producing cells. Inducible depletion of γδ Tcells show that direct interaction between γδ Tcells and immature B cells in the spleen support an "innate" transition to mature B cells with a broad range of antigen specificities. IL-4 production of γδ Tcells and cell-to-cell contact via CD30L support B cell maturation and induce genes of the unfolded protein response and mTORC1 signaling. Eight days after invivo depletion of γδ Tcells, increased numbers of B cells are already stuck in the transitional phase and express increased levels of IgD and CD21. Absence of γδ Tcells leads also to reduced levels of serum anti-nuclear autoantibodies, making γδ Tcells an attractive target to treat autoimmunity.
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