Hepal-6 derived RNA electroporated murine spleen B cells induced antitumor effects in vivo

RNA electroporated CD40 ligand-activated B cells can induce cytotoxic T-lymphocyte response in vitro. In order to evaluate the effects in vivo, we applied murine spleen B cell vaccine in a mouse model of liver cancer. C57BL/6 mouse spleen B cells were activated by anti-mouse CD40 antibody, recombinant interleukin-4, and cyclosporin A, and then electroporated with total RNA from Hepal-6 cells (Hepal-6 RNA-CD40mAb-B cells). This vaccine was injected into C57BL/6 mice that were subcutaneously inoculated with Hepal-6 cells. Hepal-6 RNA-CD40mAb-B cells could induce tumor-specific cytotoxic T cells and IFN-gamma secretion in the immunized mice. In vivo study showed this vaccine could well inhibit tumor progression, improve overall survival, and provide continuous immunoprotection against Hepal-6 cell-induced tumor. Tumor cell-derived total RNA electroporated B cells vaccine is a type of effective immunotherapy and provides potential implication for clinical treatment.