Abstract
The anti-apoptotic function and tumor-associated expression of heat-shock protein 70 (HSP70) is consistent with HSP70 functioning as a survival factor to promote tumorigenesis. However, its immunomodulatory activities to induce anti-tumor immunity predict the suppression of tumor growth. Using the Hsp70.1/3−/−(Hsp70−/−) mouse model, we observed that tumor-derived HSP70 was neither required for cellular transformation nor for in vivo tumor growth. Hsp70−/− murine embryonic fibroblasts (MEFs) were transformed by E1A/Ras and generated tumors in immunodeficient hosts as efficiently as wild-type (WT) transformants. Comparison of Bcr-Abl-mediated transformation of WT and Hsp70−/− bone marrow and progression of B-cell leukemogenesis in vivo revealed no differences in disease onset or survival rates, and Eμ-Myc-driven lymphoma in Hsp70−/− mice was phenotypically indistinguishable from that in WT Eμ-Myc mice. However, Hsp70−/− E1A/Ras MEFs generated significantly larger tumors than their WT counterparts in C57BL/6 J immune-competent hosts. Concurrent with this was a reduction in intra-tumoral infiltration of innate and adaptive immune cells, including macrophages and CD8+ T cells. Evaluation of several potential mechanisms revealed an HSP70-chemokine-like activity to promote cellular migration. These observations support a role for tumor-derived HSP70 in facilitating anti-tumor immunity to limit tumor growth and highlight the potential consequences of anti-HSP70 therapy as an efficacious anti-cancer strategy.
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Acknowledgements
We thank Dr Douglas Green for discussion during the preparation of this manuscript and Eleanora Puetz and Alex Yu for genotyping. Special thanks to the husbandry staff of the Animal Resource Center and to the Animal Imaging Center, including Christopher Calabrese, Melissa Johnson and Monique Payton. We are grateful to the flow cytometry facility for their assistance in FACS and flow analysis. This work was funded in part by core funding and Cancer Center Supporting Grant (CCSG) developmental funds (5P30CA021765–29) (to HMB) and the American Lebanese-Syrian Associated Charities of St Jude Children’s Research Hospital.
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Dodd, K., Nance, S., Quezada, M. et al. Tumor-derived inducible heat-shock protein 70 (HSP70) is an essential component of anti-tumor immunity. Oncogene 34, 1312–1322 (2015). https://doi.org/10.1038/onc.2014.63
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DOI: https://doi.org/10.1038/onc.2014.63
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