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The Journal of Immunology, Vol 158, Issue 6 2592-2599, Copyright © 1997 by American Association of Immunologists
ARTICLES |
YW He, H Nakajima, WJ Leonard, B Adkins and TR Malek
Department of Microbiology, University of Miami School of Medicine, FL 33101, USA.
Signaling through the common gamma chain (gamma c), a subunit of the receptors for IL-2, -4, -7, -9, and -15, is critical for lymphocyte development, with the IL-7/IL-7R representing one important interaction. To investigate the stages of intrathymic T cell development that are dependent on gamma c and to determine whether gamma c controls T cell development solely as a component of the IL-7R, intrathymic T cell development was compared in IL-7R alpha-deficient mice and anti-gamma c-treated chimeric mice reconstituted with bone marrow and purified pro-T cells. In the presence of anti-gamma c, each of four phenotypically distinguishable stages of CD4- CD8- thymocytes failed to reconstitute T cell development, suggesting that each of these subsets of pro-T cells required gamma c for their differentiation and/or growth. Reconstitution of anti-gamma c-treated chimeric mice with bone marrow from IL-7R alpha-deficient mice indicated that IL-7R only partially contributed to intrathymic T cell development. Furthermore, when compared with IL-7R-deficient mice, anti-gamma c chimeric and gamma c-deficient mice exhibited a distinct phenotypic pattern of pro-T cell development. Collectively, these results indicate that several gamma c-sharing cytokines may contribute to T cell development in the thymus and suggest that one of these cytokines may be novel.
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