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Erschienen in: Cancer Immunology, Immunotherapy 12/2016

12.10.2016 | Original Article

Anti-GITR therapy promotes immunity against malignant glioma in a murine model

verfasst von: Jason Miska, Aida Rashidi, Alan L. Chang, Megan E. Muroski, Yu Han, Lingjiao Zhang, Maciej S. Lesniak

Erschienen in: Cancer Immunology, Immunotherapy | Ausgabe 12/2016

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Abstract

Regulatory T cells (Tregs) are potently immunosuppressive cells that accumulate within the glioma microenvironment. The reduction in their function and/or trafficking has been previously shown to enhance survival in preclinical models of glioma. Glucocorticoid-induced TNFR-related protein (GITR) is a tumor necrosis factor superfamily receptor enriched on Tregs that has shown promise as a target for immunotherapy. An agonistic antibody against GITR has been demonstrated to inhibit Tregs in a number of models and has only been recently addressed in glioma. In this study, we examined the modality of the antibody function at the tumor site as opposed to the periphery as the blood–brain barrier prevents efficient antibody delivery to brain tumors. Mice harboring established GL261 tumors were treated with anti-GITR monotherapy and were shown to have a significant increase in overall survival (p < 0.01) when antibodies were injected directly into the glioma core, whereas peripheral antibody treatment only had a modest effect. Peripheral treatment resulted in a significant decrease in granzyme B (GrB) expression by Tregs, whereas intratumoral treatment resulted in both a decrease in GrB expression by Tregs and their selective depletion, which was largely mediated by FcγR-mediated destruction. We also discovered that anti-GITR treatment results in the enhanced survival and functionality of dendritic cells (DCs)—a previously unreported effect of this immunotherapy. In effect, this study demonstrates that the targeting of GITR is a feasible and noteworthy treatment option for glioma, but is largely dependent on the anatomical location in which the antibodies are delivered.
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Metadaten
Titel
Anti-GITR therapy promotes immunity against malignant glioma in a murine model
verfasst von
Jason Miska
Aida Rashidi
Alan L. Chang
Megan E. Muroski
Yu Han
Lingjiao Zhang
Maciej S. Lesniak
Publikationsdatum
12.10.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
Cancer Immunology, Immunotherapy / Ausgabe 12/2016
Print ISSN: 0340-7004
Elektronische ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-016-1912-8

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