Journal
JOURNAL OF IMMUNOLOGY
Volume 164, Issue 2, Pages 596-602Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.164.2.596
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- NCI NIH HHS [CA 25803, CA 57885] Funding Source: Medline
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p53 is an attractive target for cancer immunotherapy since it is overexpressed in half of all tumors. However, it is also expressed in normal lymphoid tissue, and self tolerance leaves a p53-specific repertoire purged of high avidity CTL, To better understand the mechanism of tolerance and the basis for such low avidity interaction, p53-specific CTL from p53 deficient (p53(-)) and sufficient (p53(+)) A2.1/K-b transgenic mice were compared with respect to their ability to bind HLA-A2.1 tetramers containing cognate murine p53 peptide Ag, p53 261-269, Since the murine CD8 molecule cannot interact with human KLA-A2.1, this tests the ability of the TCR to bind the A2/1.peptide complex: tetramer, CTL from p53- mice demonstrated strong binding of such A2.1/p53 261-269 tetramers; however, the CTL from tolerant p53+ mice were devoid of tetramer-binding CD8(+) T cells. Examination of TCR expression at the clonal level revealed that CTL from p53(+) and p53- mice each expressed comparable levels of the p53-specific TCR, These results indicate that normal expression of p53 promotes elimination of T cells expressing TCRs with sufficient affinity to achieve stable binding of the A2.1/p53 261-269 tetramers.
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