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CD4+ T cells inhibit the neu-specific CD8+ T-cell exhaustion during the priming phase of immune responses against breast cancer

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Abstract

Studies conducted in animal model of infectious diseases or H-Y antigen model suggest a crucial role for CD4+ T cells in providing help for CD8+ T-cell memory responses. This concept suggests that inclusion of T helper epitopes in vaccine formulation will result in improved CD8+ T-cell responses. Although this concept has been applied to cancer vaccine design, the role of CD4+ T cells in the memory differentiation of CD8+ T cells and retention of their anti-tumor function have never been tested in breast cancer model. Using the FVB mouse model of neu-positive breast carcinoma we report for the first time that helpless T cells showed cytostatic or tumor inhibitory effects during primary tumor challenge whereas, helped T cells showed cytotoxic effects and resulted in complete tumor rejection. Such differential effects, in vivo, were associated with higher frequency of CD8+PD-L1+ and CD8+PD-1+ T cells in animals harboring helpless T cells as well as higher titer of IL-2 in the sera of animals harboring helped T cells. However, depletion of CD4+ T cells did not alter the ability of neu-specific CD8+ T cells to differentiate into memory cells and to retain their effector function against the tumor during recall challenge. These results suggest the inhibitory role of CD4+ T cells on CD8+ T-cell exhaustion without substantial effects on the differentiation of memory T cells during priming phase of the immune responses against breast cancer.

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Acknowledgments

This work was supported by NIH R01 CA104757 Grant (M. H. Manjili) and flow cytometry shared resources facility supported in part by the NIH Grant P30CA16059. We thank Dr. William Lee of the U Penn for providing us with pEF2-dnIFN-γ Rα vector. We also thank Julie Farnsworth for her expertise in cell sorting and immense dedication to furthering the research at our institution. We gratefully acknowledge the support of VCU Massey Cancer Centre and the Commonwealth Foundation for Cancer Research.

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Correspondence to Masoud H. Manjili.

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M. Kmieciak and A. Worschech had equal contribution to this work.

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Fig. S1

FVB mice (n = 3) were depleted of CD4+ and CD8+ T cells by i.p. injection of GK1.5 and 2.43 Abs, respectively. Animals were then inoculated with MMC (5 × 106 cells/mouse) and tumor growth was determined. (TIFF 2457 kb)

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Kmieciak, M., Worschech, A., Nikizad, H. et al. CD4+ T cells inhibit the neu-specific CD8+ T-cell exhaustion during the priming phase of immune responses against breast cancer. Breast Cancer Res Treat 126, 385–394 (2011). https://doi.org/10.1007/s10549-010-0942-8

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  • DOI: https://doi.org/10.1007/s10549-010-0942-8

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