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The hormone nuclear receptor retinoic acid receptor-related orphan receptor gamma (RORgamma) plays important roles in thymocyte development and lymphoid organogenesis. RORgamma and its thymus-specific isoform RORgammat are expressed in the thymus, but not in the spleen and bone marrow (BM). However, RORgamma(-/-) mice have 2- to 3-fold more splenocytes than wild-type controls due to an accumulation of conventional resting B lymphocytes. The increase in B lymphocytes in RORgamma(-/-) mice is caused neither by abnormal B cell development in the BM nor by an obvious defect in the peripheral T cell compartment. Furthermore, analyses of BM chimeras using either RORgamma(-/-) or recombinase-activating gene-2(-/-) mice as recipients and wild-type or RORgamma(-/-) mice as donors, respectively, demonstrate that the splenic microenvironment of RORgamma(-/-) mice is defective, since wild-type T and B lymphocytes accumulated in these chimeric mice. In addition, T lymphocyte homeostasis was altered due to a lowered thymic output in RORgamma(-/-) mice. Collectively, these results suggest that RORgamma regulates lymphocyte homeostasis at multiple levels.

Lymphocyte Accumulation in the Spleen of Retinoic Acid Receptor-Related Orphan Receptor γ-Deficient Mice