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    Intermediate steps in positive selection: differentiation of CD4+8int TCRint thymocytes into CD4-8+TCRhi thymocytes.

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    Author
    Lundberg, K; Heath, W; Köntgen, F; Carbone, FR; Shortman, K
    Date
    1995-05-01
    Source Title
    Journal of Experimental Medicine
    Publisher
    Rockefeller University Press
    University of Melbourne Author/s
    Heath, William; Carbone, Francis
    Affiliation
    Microbiology and Immunology
    Metadata
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    Document Type
    Journal Article
    Citations
    Lundberg, K., Heath, W., Köntgen, F., Carbone, F. R. & Shortman, K. (1995). Intermediate steps in positive selection: differentiation of CD4+8int TCRint thymocytes into CD4-8+TCRhi thymocytes.. J Exp Med, 181 (5), pp.1643-1651. https://doi.org/10.1084/jem.181.5.1643.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/256605
    DOI
    10.1084/jem.181.5.1643
    Open Access at PMC
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2191983
    Abstract
    The differentiation potential of putative intermediates between CD4+8+ thymocytes and mature T cells has been examined. Such intermediate populations were sorted, in parallel with CD4+8+ thymocytes, from three types of C57BL/6 mice: major histocompatibility complex (MHC) class II-deficient mice, mice transgenic for an alpha/beta T cell receptor (TCR) restricted by class I MHC and normal mice. The sorted populations were then transferred into the thymus of nonirradiated C57BL/Ka mice differing in Thy 1 allotype, and the progeny of the transferred cells were analyzed 2 d later. Surprisingly, with all three types of donor mice, a major proportion of the CD4+8intTCRint-derived progeny were found to be CD4-8+TCRhi cells, thus delineating a new alternative pathway for development of the CD8 lineage. In contrast, the transfer of CD4int8+TCRint thymocytes produced CD4-8+TCRhi cells but no significant proportion of CD4+8-TCRhi cells, suggesting that there is no equivalent alternative pathway for the CD4 lineage. The results negate some of the evidence for a stochastic/selective model of lineage commitment, and point to an asymmetry in the steps leading to CD4-8+ versus CD4+8- T cells.

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