Abstract
Purpose
Lipopolysaccharide (LPS) is a major component of the outer surface membrane of Gram-negative bacteria which has been proved an effective immune enhancer. Here, we investigated the anti-tumor effect of irradiated tumor cells that stimulated by LPS in mouse xenografts models.
Methods
Tumor cells were irradiated after stimulation with 1 μg/mL LPS for 48 h. The C57BL/6 mice were immunized subcutaneously with irradiated tumor cells. The anti-tumor effect of lymphocytes of immunized mice was investigated. The cytotoxicity of spleen lymphocytes from immunized mice was determined by a standard 51Cr-release assay. The roles of immune cell subsets in anti-tumor activity were assessed by injected intraperitoneally with monoclonal antibodies.
Results
We observed that the vaccine of irradiated tumor cell with LPS-stimulated elicited a stronger protective anti-tumor immunity than other controls. Adoptive transfer of lymphocytes of immunized mice showed that the cellular immune response was involved in the anti-tumor effect. And this effect was achieved by activation of antigen-specific CD8+ T cell response and reduction of myeloid-derived suppressor cells (MDSCs, Gr1+ CD11b+), which were confirmed by depletion of immune cell subsets and flow cytometry analysis.
Conclusions
In summary, our study showed that stimulation of LPS was able to enhance anti-tumor immunity of vaccination with tumor cells after irradiation treatment, which might be a new strategy for cancer therapy.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grants 81123003 and 81301980) and China Postdoctoral Science Foundation (2013M542283).
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The authors declare no conflicts of interest.
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Li, Y., Shen, G., Nie, W. et al. Irradiated tumor cells of lipopolysaccharide stimulation elicit an enhanced anti-tumor immunity. J Cancer Res Clin Oncol 140, 1815–1823 (2014). https://doi.org/10.1007/s00432-014-1721-4
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DOI: https://doi.org/10.1007/s00432-014-1721-4