Grauer, Oliver M. and Sutmuller, Roger P. M. and van Maren, Wendy and Jacobs, Joannes F. M. and Bennink, Erik and Toonen, Liza W. J. and Nierkens, Stefan and Adema, Gosse J. (2008) Elimination of regulatory T cells is essential for an effective vaccination with tumor lysate-pulsed dendritic cells in a murine glioma model. INTERNATIONAL JOURNAL OF CANCER, 122 (8). pp. 1794-1802. ISSN 0020-7136, 1097-0215
Full text not available from this repository. (Request a copy)Abstract
Both melanoma and glioma cells are of neuroectodermal origin and share common tumor associated antigens. In this article, we report that the melanocyte differentiation antigen TRP2 (tyrosinase-related protein 2) is not predominately involved in the tumor rejection of a syngeneic murine glioma. Although GL261 glioma cells endogenously expressed TRP2 and were lysed by TRP2 specific cytotoxic T cells (CTLs) in vitro, vaccinations with TRP2 peptide-pulsed dendritic cells (DCs) could only induce minor antiglioma responses in a prophylactic setting and failed to work in a stringent setting where vaccine and tumor were administered on the same day. Further analysis revealed that TRP2 is not recognized by bulk CTLs after depletion of regulatory T cells which results in tumor rejections in vivo. In contrast to TRP2 peptide-pulsed DC, tumor lysate-pulsed DCs were more potent as a vaccine and completely protected mice from tumor outgrowth in a prophylactic setting. However, the vaccine efficacy of tumor lysate-pulsed DC was not sufficient to prevent the tumor outgrowth when tumors were inoculated the same day. In this case, Treg depletion before vaccination was essential to boost antiglioma immune responses leading to the rejection of 80% of the mice and long-term immunity. Therefore, we conclude that counteracting the immunosuppressive glioma tumor environment via depletion of regulatory T cells is a prerequisite for successful eradication of gliomas after targeting multiple tumor antigens by using tumor lysate-pulsed DCs as a vaccine in a more stringent setting. (c) 2007 Wiley-Liss, Inc.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TYROSINASE-RELATED PROTEIN-2; ANTITUMOR IMMUNE-RESPONSE; PHASE-I/II TRIAL; IN-VIVO; MALIGNANT GLIOMA; INTRACRANIAL GLIOMAS; HUMAN GLIOBLASTOMA; BRAIN-TUMORS; MONOCLONAL-ANTIBODY; RECURRENT GLIOMA; glioma; TRP2; tumor lysate; dendritic cell; regulatory T cell; CD25-depletion |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Neurologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Nov 2020 07:58 |
| Last Modified: | 04 Nov 2020 07:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/31046 |
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