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Differentiation potential of subsets of CD48 thymocytes

Abstract

Precursor T cells in the thymus are contained within a subpopulation of thymocytes that lack the markers CD4 and CD81–5. We have examined the heterogeneity of these cells by flow cytometric analysis, and defined four subpopulations using the cell surface markers Thy-1, J11d6,7 and the IL-2 receptor (IL-2R). The J11d+ subset of CD48 cells all bear the antigen Thy-1, and some express the IL-2R. Staining and RNA analysis of J11d+ cells suggest that some express receptors of the CD3γδ type, but none express CD3αβ receptors. In fetal thymus organ culture, the J11d+ cells diversify to form 'cortical type' CD4+8+ cells and 'medullary type' cells expressing either CD4 or CD8; in vivo they repopulate the thymus of an irradiated host and seed the periphery with T cells. In contrast, the J11d subset of CD48 thymocytes do not all bear Thy-1 and none express the IL-2R, but some express antigen receptors of the CD3αβ type. They have more limited diversification potential in organ culture, and in vivo fail to recolonize the irradiated host in a homing-independent assay. We conclude that they are not precursor T cells, but rather a side-branch from the main line of T cell differentiation.

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Crispe, I., Moore, M., Husmann, L. et al. Differentiation potential of subsets of CD48 thymocytes. Nature 329, 336–339 (1987). https://doi.org/10.1038/329336a0

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