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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Medema, J. P. De Jong, J. Albar, J. P. Bres, S. A. Verdegaal, E. M. Offringa, R. Franken, K. L. Hahne, M. Melief, C. J. Peltenburg, L. T. Gorter, A. |
| Description | Author Affiliation: Medema JP ( Department of Immunohematology and Bloodtransfusion, Leiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The Netherlands. medema@mail.medfac.leidenuniv.nl); |
| Abstract | The concept for cellular immunotherapy of solid tumors relies heavily on the capacity of class I MHC-restricted cytotoxic T lymphocytes (CTLs) to eliminate tumor cells. However, tumors often have managed to escape from the cytolytic machinery of these effector cells. Therefore, it is very important to chart the mechanisms through which this escape can occur. Target-cell killing by CTLs involves the induction of apoptosis by two major mechanisms: through death receptors and the perforin/granzyme B (GrB) pathway. Whereas tumors previously were shown to exhibit mechanisms for blocking the death receptor pathway, we now demonstrate that they also can resist CTL-mediated killing through interference with the perforin/GrB pathway. This escape mechanism involves expression of the serine protease inhibitor PI-9/SPI-6, which inactivates the apoptotic effector molecule GrB. Expression of PI-9 was observed in a variety of human and murine tumors. Moreover, we show that, indeed, expression results in the resistance of tumor cells to CTL-mediated killing both in vitro and in vivo. Our data reveal that PI-9/SPI-6 is an important parameter determining the success of T cell-based immunotherapeutic modalities against cancer. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 98 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2001-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Membrane Glycoproteins Metabolism Serine Endopeptidases Serine Proteinase Inhibitors Pharmacology Animals Breast Neoplasms Immunology Colonic Neoplasms DNA Primers Flow Cytometry Granzymes Insect Proteins Melanoma Mice Perforin Pore Forming Cytotoxic Proteins Tumor Cells, Cultured Uterine Cervical Neoplasms Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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