Poly(I:C) enhanced anti-cervical cancer immunities induced by dendritic cells-derived exosomes.

Dendritic cell (DC)-derived exosomes (Dexo) has been confirmed to be able to induce the specific anti-tumor immune response ex vivo and in vivo. Here， the aim of this study was to evaluate the application of the antigen-pulsed Dexo as a new vaccination platform in immunotherapy for cervical cancer. The immunogenic profile of the different Dexo was assessed by the cell proliferation， cytokines secretion and effector functions of CD8 T cells and the splenocytes from Dexo-vaccinated mice. Furthermore， the anti-tumor immunity elicited by Dexo was further compared in cervical cancer-bearing mice. Dexo from DCs loaded with E7 peptide could efficiently induce the cytotoxic activity of CD8 T cells on TC-1 tumor cells ex vivo， the proliferation and IFN-γ excretion of CD8 T cells. Moreover， Dexo vaccine promoted the immune responses of vaccinated mice splenocytes induced by antigen E7 in vitro restimulation. Of note， poly(I:C) was significantly more potent inducer of the antigen-loaded Dexo mediated protective immunity responses for cervical cancer and further evidenced by that Dexo(E7+pIC) markedly inhibited the tumor growth and improved the survival rate of the tumor-bearing mice. We provided evidence that poly(I:C) dramatically increased the potent antitumoral immunity induced by antigen-pulsed Dexo for ameliorating cervical cancer.