The Journal of Experimental Medicine
3rd Skeletal Biology and Medicine Symposium
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J. Exp. Med., Volume 187, Number 11, June 1, 1998 1813-1823

An Alternate Pathway for T Cell Development Supported by the Bone Marrow Microenvironment: Recapitulation of Thymic Maturation

By Marcos E. García-Ojeda,* Sussan Dejbakhsh-Jones,* Irving L. Weissman,Dagger and Samuel Strober*

From the * Division of Immunology and Rheumatology, Department of Medicine, and the Dagger  Department of Pathology, Stanford University School of Medicine, Stanford, California 94305

In the principal pathway of alpha /beta T cell maturation, T cell precursors from the bone marrow migrate to the thymus and proceed through several well-characterized developmental stages into mature CD4+ and CD8+ T cells. This study demonstrates an alternative pathway in which the bone marrow microenvironment also supports the differentiation of T cell precursors into CD4+ and CD8+ T cells. The marrow pathway recapitulates developmental stages of thymic maturation including a CD4+CD8+ intermediary cell and positive and negative selection, and is strongly inhibited by the presence of mature T cells. The contribution of the marrow pathway in vivo requires further study in mice with normal and deficient thymic or immune function.

Key words: extrathymicbone marrowT celldevelopmentthymus


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