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Malaghan Institute of Medical Research, Wellington School of Medicine, Wellington, New Zealand; and
Boehringer Ingelheim Pharmaceuticals Inc., Ridgefield, CT 06877
The contribution of CD4+ T cells to dendritic cell (DC) activation and to the induction of CD8+ T cell responses in vivo was investigated using a model of antitumor immune responses. Immunization with peptide-loaded MHC class II-deficient (MHC class II-/-) DC induced the activation of Ag-specific CD8+ T cells and their accumulation in the lymph nodes and spleens of immunized mice. The accumulation induced by MHC class II-/- DC immunization was lower than the accumulation observed after immunization with MHC class II+/+ DC. Similarly, immunization with peptide-loaded, MHC class II-/- DC induced some degree of protection against tumor challenge, but this protection was lower than the protection achieved after immunization with MHC class II+/+ DC. Incubation with a membrane-associated form of CD40 ligand resulted in the up-regulation of costimulatory molecules on MHC class II-/- DC and fully rescued their ability to induce antitumor immunity. We conclude that CD4+ T cells play a critical role in the generation of antitumor immune responses through their capacity to induce the activation of DC via CD40/CD40 ligand interaction, and thus maximize CD8+ T cell responses.
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