Abstract
THE protein Lck (p56lck) has a relative molecular mass of 56,000 and belongs to the Src family of tyrosine kinases1–3. It is expressed exclusively in lymphoid cells, predominantly in thymocytes and peripheral T cells4,5. Lck associates specifically with the cytoplasmic domains of both CD4 and CD8 T-cell surface glycoproteins6,7 and interacts with the β-chain of the interleukin-2 receptor8, which implicates Lck activity in signal transduction during thymocyte ontogeny9–13 and activation of mature T cells14–19. Here we generate an lck null mutation by homologous recombination in embryonic stem cells to evaluate the role of p56lck in T-cell development and activation. Lck-deficient mice show a pronounced thymic atrophy, with a dramatic reduction in the double-positive (CD4+CD8+) thymocyte population. Mature, single-positive thymocytes are not detectable in these mice and there are only very few peripheral T cells. These results illustrate the crucial role of this T-cell-specific tyrosine kinase in the thymocyte development.
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Molina, T., Kishihara, K., Siderovskid, D. et al. Profound block in thymocyte development in mice lacking p56lck. Nature 357, 161–164 (1992). https://doi.org/10.1038/357161a0
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DOI: https://doi.org/10.1038/357161a0
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