Abstract
Purpose
Dendritic cell (DC)-based cancer vaccines are currently being evaluated as novel anti-tumor vaccination strategies, but in some cases, they are demonstrated to have poor clinical efficacies than anticipated. A potential reason is immune tolerance due to the immunosuppressive enzyme, indoleamine-pyrrole 2,3-dioxygenase (IDO). The aim of this study was to determine whether blocking the activity of IDO might improve the anti-tumor efficacy of DC/Lewis lung carcinoma (LLC) fusion vaccine applied to the mouse LLC model.
Methods
To prepare the DC/LLC fusion vaccine, DCs were fused with LLC using polyethylene glycol (PEG) as described. The IDO expression in the DC/LLC fusion vaccine and in the vaccinated mice was detected by western blot (WB) and/or immunohistochemical (IHC) analysis. This fusion vaccine, as a single agent or in combination with 1-methyl-tryptophan (1-MT, an IDO inhibitor), was administered to LLC mice. The anti-tumor efficacy in different treatment was determined by regular observation of tumor development and the level of splenic cytotoxic T lymphocyte (CTL) response, which was examined by lactate dehydrogenase (LDH) release.
Results
In the LLC mice, we observed that IDO-positive cells were extensively accumulated in tumor draining lymph nodes (TDLNs). Furthermore, WB and IHC analysis results showed that vaccination with fusion DC/LLC cells alone caused significant up-regulation of IDO in spleens. 1-MT enhanced the anti-tumor efficacy elicited by DC/LLC fusion vaccine via delaying the tumor development and inducing stronger splenic CTL responses.
Conclusions
Our results indicate an IDO-mediated immunosuppressive mechanism might be involved in weakening the anti-tumor efficacy elicited by DC/LLC fusion vaccine, and specific inhibition of IDO activity might be required for development of cancer vaccines.
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Acknowledgments
This work was supported by National Natural Science Foundation in China (No. NSFC-30471978, and No. NSFC-30672510) and Natural Scientific Foundation of Guangdong Province (Grant code: 5001771).
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Ou, X., Cai, S., Liu, P. et al. Enhancement of dendritic cell-tumor fusion vaccine potency by indoleamine-pyrrole 2,3-dioxygenase inhibitor, 1-MT. J Cancer Res Clin Oncol 134, 525–533 (2008). https://doi.org/10.1007/s00432-007-0315-9
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DOI: https://doi.org/10.1007/s00432-007-0315-9