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- W1569501086 abstract "Abstract A novel thymocyte subpopulation expressing an unusual TCR repertoire was identified by high surface expression of the Ly-6C Ag. Ly-6C+ thymocytes were distributed among all four CD4/CD8 thymocyte subsets, and represented a readily identifiable subpopulation within each one. Ly-6C+ thymocytes express TCR-alpha beta, arise late in ontogeny, and appear in the CD4/CD8 developmental pathway after birth in a sequence that resembles that followed by conventional Ly-6C- cells during fetal ontogeny. Most interestingly, adult Ly-6C+ thymocytes express an unusual TCR-V beta repertoire that is identical to that expressed by CD4-CD8-TCR-alpha beta+ thymocytes in its overexpression of TCR-V beta 8 and in its expression of some potentially autoreactive TCR-V beta specificities. This unusual TCR-V beta repertoire was even expressed by Ly-6C+ thymocytes contained within the CD4+ CD8- 'single positive' thymocyte subset. Thus, expression of this unusual TCR-V beta repertoire is not limited to CD4-CD8-thymocytes, and is unlikely to be a consequence of their double negative phenotype. Rather, we think that Ly-6C+TCR-alpha beta+ thymocytes and CD4-CD8-TCR-alpha beta+ are developmentally interrelated, a conclusion supported by several lines of evidence including the selective failure of both Ly-6C+ and CD4-CD8-TCR-alpha beta+ thymocyte subsets to appear in TCR-beta transgenic mice. In contrast, peripheral Ly-6C+ T cells are developmentally distinct from Ly-6C+ thymocytes in that peripheral Ly-6C+ T cells expressed a conventional TCR-V beta repertoire and developed normally in TCR-beta transgenic mice in which Ly-6C+ thymocytes failed to arise. We conclude that: 1) expression of a skewed TCR-V beta repertoire is a characteristic of Ly-6C+TCR-alpha beta+ thymocytes as well as CD4-CD8-TCR-alpha beta+ thymocytes, and is not unique to thymocytes expressing neither CD4 nor CD8 accessory molecules; and 2) Ly-6C+ thymocytes are developmentally linked to CD4-CD8-TCR-alpha beta+ thymocytes, but not to Ly-6C+ peripheral T cells. We suggest that Ly-6C+TCR-alpha beta+ thymocytes are not the developmental precursors of Ly-6C+ peripheral T cells, but rather may be the developmental precursors of CD4-CD8-TCR-alpha beta+ thymocytes." @default.
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- W1569501086 title "Expression of an unusual T cell receptor (TCR)-V beta repertoire by Ly-6C+ subpopulations of CD4+ and/or CD8+ thymocytes. Evidence for a developmental relationship between Ly-6C+ thymocytes and CD4-CD8-TCR-alpha beta+ thymocytes." @default.
- W1569501086 doi "https://doi.org/10.4049/jimmunol.147.9.2883" @default.
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