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Previous work has established a role for CD40-mediated signals in eliciting helper-dependent CD8(+) T cell responses. Here we investigated the effects of in vivo CD40 stimulation on the survival and function of tumor-specific CD8(+) T cells in a mouse melanoma model system. We found that agonistic anti-CD40 antibody treatment alone of tumor-bearing mice accelerated the deletion of tumor-antigen-specific T cells. However, long-term survival and function of tumor-antigen-specific T cells could be achieved when viral immunization with tumor antigen and anti-CD40 treatment were combined. This rescue of CD8(+) T cells could not be easily replicated by inflammatory or antigen-specific stimuli alone, demonstrating the specificity of signals that regulate the deletion or survival of tumor-specific T cells. These results demonstrate that opposing effects can be elicited by CD40 stimulation in vivo and suggest the need for caution in using this treatment for cancer patients.

CD40 stimulation accelerates deletion of tumor-specific CD8+T cells in the absence of tumor-antigen vaccination

CD40 stimulation accelerates deletion of tumor-specific CD8⁺T cells in the absence of tumor-antigen vaccination