Abstract
Background
Multiple studies have shown that dendritic cell (DC)-based vaccines can induce antitumor immunity. Previously, we reported that gemcitabine enhances the efficacy of DC vaccination in a mouse model of pancreatic carcinoma. The present study aimed at investigating the influence of gemcitabine on vaccine-induced anti-tumoral immune responses in a syngeneic pancreatic cancer model.
Materials and methods
Subcutaneous or orthotopic pancreatic tumors were induced in C57BL/6 mice using Panc02 cells expressing the model antigen OVA. Bone marrow-derived DC were loaded with soluble OVA protein (OVA-DC). Animals received gemcitabine twice weekly. OVA-specific CD8+ T-cells and antibody titers were monitored by FACS analysis and ELISA, respectively.
Results
Gemcitabine enhanced clinical efficacy of the OVA-DC vaccine. Interestingly, gemcitabine significantly suppressed the vaccine-induced frequency of antigen-specific CD8+ T-cells and antibody titers. DC migration to draining lymph nodes and antigen cross-presentation were unaffected. Despite reduced numbers of tumor-reactive T-cells in peripheral blood, in vivo cytotoxicity assays revealed that cytotoxic T-cell (CTL)-mediated killing was preserved. In vitro assays revealed sensitization of tumor cells to CTL-mediated lysis by gemcitabine. In addition, gemcitabine facilitated recruitment of CD8+ T-cells into tumors in DC-vaccinated mice. T- and B-cell suppression by gemcitabine could be avoided by starting chemotherapy after two cycles of DC vaccination.
Conclusions
Gemcitabine enhances therapeutic efficacy of DC vaccination despite its negative influence on vaccine-induced T-cell proliferation. Quantitative analysis of tumor-reactive T-cells in peripheral blood may thus not predict vaccination success in the setting of concomitant chemotherapy.
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Abbreviations
- CFSE:
-
Carboxyfluorescein succinimidyl ester
- CTL:
-
Cytotoxic T-cell
- DC:
-
Dendritic cell
- ELISA:
-
Enzyme-linked immunosorbent assay
- FACS:
-
Fluorescence-activated cell sorter
- FoxP3:
-
Forkheadbox P3
- Gem:
-
Gemcitabine
- GM-CSF:
-
Granulocyte macrophage colony-stimulating factor
- IFN-γ:
-
Interferon-γ
- i.v.:
-
Intravenous
- i.p.:
-
Intraperitoneal
- ICS:
-
Intracellular staining
- LPS:
-
Lipopolysaccharide
- MHC-I:
-
Major histocompatibility complex I
- MDSC:
-
Myeloid-derived suppressor cell
- OD:
-
Optical density
- OVA:
-
Ovalbumine
- OVA-DC:
-
OVA protein-loaded DC
- p15E:
-
Retroviral protein expressed by Panc02 cells
- s.c.:
-
Subcutaneous
- SIINFEKL:
-
Immunodominant MHC-I epitope of the ovalbumine protein
- TNF-α:
-
Tumor necrosis factor-α
- Treg :
-
Regulatory CD4+ Foxp3+ T-cell
- TRP2:
-
Tryosinase-related peptide 2
- U-DC:
-
Unloaded but LPS-stimulated DC
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Acknowledgments
Christian Bauer, Franz Bauernfeind and Marc Dauer were supported by grants from the University of Munich (FoeFoLe No. 481, Promotionsstudium Molekulare Medizin, Gravenhorst-Stiftung) and the Saarland University (HOMFOR). Max Schnurr was supported by the Deutsche Krebshilfe (Max Eder Research Grant) and the Deutsche Forschungsgemeinschaft (SCHN 664/3-1, SCHN 664/3-2 and GK 1202). Transgenic OT-1 animals were kindly provided by Prof. Thomas Brocker (Department of Immunology, University of Munich, Germany).
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All authors declare that no conflicts of interest exist.
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Christian Bauer and Alexander Sterzik, and Max Schnurr and Marc Dauer have contributed equally to this article.
This work is part of the doctoral thesis of Alexander Sterzik and Franz Bauernfeind at the University of Munich, Germany.
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Bauer, C., Sterzik, A., Bauernfeind, F. et al. Concomitant gemcitabine therapy negatively affects DC vaccine-induced CD8+ T-cell and B-cell responses but improves clinical efficacy in a murine pancreatic carcinoma model. Cancer Immunol Immunother 63, 321–333 (2014). https://doi.org/10.1007/s00262-013-1510-y
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DOI: https://doi.org/10.1007/s00262-013-1510-y