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Riewaldt, J.* ; Düber, S.* ; Boernert, M.* ; Krey, M.* ; Dembinski, M.* ; Weiss, S.* ; Garbe, A.I.* ; Kretschmer, K.*

Severe developmental B lymphopoietic defects in Foxp3-deficient mice are refractory to adoptive regulatory T cell therapy.

Front. Immunol. 3:141 (2012)

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The role of Foxp3-expressing regulatory T (T(reg)) cells in tolerance and autoimmunity is well-established. However, although of considerable clinical interest, the role of T(reg) cells in the regulation of hematopoietic homeostasis remains poorly understood. Thus, we analysed B and T lymphopoiesis in the scurfy (Sf) mouse model of T(reg) cell deficiency. In these experiments, the near-complete block of B lymphopoiesis in the BM of adolescent Sf mice was attributed to autoimmune T cells. We could exclude a constitutive lympho-hematopoietic defect or a B cell-intrinsic function of Foxp3. Efficient B cell development in the BM early in ontogeny and pronounced extramedullary B lymphopoietic activity resulted in a peripheral pool of mature B cells in adolescent Sf mice. However, marginal zone B and B-1a cells were absent throughout ontogeny. Developmental B lymphopoietic defects largely correlated with defective thymopoiesis. Importantly, neonatal adoptive T(reg) cell therapy suppressed exacerbated production of inflammatory cytokines and restored thymopoiesis but was ineffective in recovering defective B lymphopoiesis, probably due to a failure to compensate production of stroma cell-derived IL-7 and CXCL12. Our observations on autoimmune-mediated incapacitation of the BM environment in Foxp3-deficient mice will have direct implications for the rational design of BM transplantation protocols for patients with severe genetic deficiencies in functional Foxp3(+) T(reg) cells.

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