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  • Title: A MAGE-A3 peptide presented by HLA-DP4 is recognized on tumor cells by CD4+ cytolytic T lymphocytes.
    Author: Schultz ES, Lethé B, Cambiaso CL, Van Snick J, Chaux P, Corthals J, Heirman C, Thielemans K, Boon T, van der Bruggen P.
    Journal: Cancer Res; 2000 Nov 15; 60(22):6272-5. PubMed ID: 11103782.
    Abstract:
    Antigens encoded by MAGE-A3 and recognized by T cells are interesting targets for tumor immunotherapy because they are strictly tumor specific and shared by many tumors of various histological types. A number of MAGE-A3 antigenic peptides presented by HLA class I molecules have been used in clinical trials, and regressions of melanoma metastasis have been observed. We report here the identification of a MAGE-A3 epitope, TQHFVQENYLEY, presented to CD4+ T lymphocytes by HLA-DP4 molecules, which are expressed in approximately 76% of Caucasians. This new epitope may be useful both for therapeutic vaccination and for the evaluation of the immune response in cancer patients. Interest ingly, the CD4+ T cells lysed HLA-DP4 tumor cells expressing MAGE-A3, indicating that this epitope, in contrast to other class-II MAGE-A3 epitopes, is presented at the surface of tumor cells. The study of this disparity in the presentation of two epitopes from the same protein may lead to a better understanding of the endogenous class II presentation pathway.
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