期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 98, 期 15, 页码 8744-8749出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.141218898
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On deletion of the gene encoding the constant region of the T cell antigen receptor (TCR)alpha chain in mature T cells by induced Cre-mediated recombination, the cells lose most of their TCR from the cell surface within 7-10 days, but minute amounts of surface-bound TCR beta chains are retained for long periods of time. In a situation in which cellular influx from the thymus is blocked, TCR-deficient naive T cells decay over time, the decay rates being faster for CD8(+) cells (t(1/2) approximate to 16 days) than for CD4(+) cells (t(1/2) approximate to 46 days). TCR+ naive cells are either maintained (CD8(+)) or decay more slowly (CD4(+); t(1/2) approximate to 78 days.) Numbers of TCR-deficient memory T cells decline very slowly (CD8(+) cells; t(1/2) approximate to 52 days) or not at all (CD4(+) cells), but at the population level, these cells fail to expand as their TCR+ counterparts do. Together with earlier data on T cell maintenance in environments lacking appropriate major histocompatibility complex antigens, these data argue against the possibility that spontaneous ligand-independent signaling by the alpha beta TCR contributes significantly to T-cell homeostasis.
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