Abstract
Hsp70, a highly conserved protein, has gained plenty of attention by virtue of its adjuvant capability to induce peptide-specific cytotoxic T lymphocyte responses. In this study, we have investigated the effect of autologous Hsp70–peptide complex (or simply autologous Hsp70) on the expression of CD28 on T cells and its effector functions through macrophage activation. Further, we investigated the effect of Hsp70 on the expression of CD80 and CD86 on macrophages isolated from normal and tumor-bearing host to provide costimulatory signal for T cell activation and secretion of IL-2 and IFN-γ during interaction. We found that treatment of autologous Hsp70 effectively activated TAMs to induce higher expression of CD28 on T cells through T cells–macrophage interaction. Treatment of autologous Hsp70 induces higher expression of CD80 and CD86 on TAMs, as a result, increases B7/CD28 interaction, which in turns activates T cells and induces higher production of IL-2 and IFN-γ, thereby increasing antigen-specific T cell proliferation. With our novel study, we have provided the strong insights into the role of extracellular Hsp70 on the expression of CD28 costimulatory molecule on T cells, which helps in the activation and generation of antigen-specific T cell effector functions in a tumor-bearing host to curb malignancy.
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We are grateful to UGC, New Delhi, for the financial support to SK as a postdoctoral research work.
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Kumar, S., Gautam, P.K., Tomar, M.S. et al. CD28-mediated T cell response is upregulated by exogenous application of autologous Hsp70–peptide complex in a tumor-bearing host. Immunol Res 64, 313–323 (2016). https://doi.org/10.1007/s12026-015-8752-z
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DOI: https://doi.org/10.1007/s12026-015-8752-z