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• W2073342076 abstract "Pseudomonas exotoxin (PE) is a 66 kDa bacterial toxin that is able to bind to mammalian cells, undergo receptor mediated endocytosis, and translocate its C-terminal catalytic domain into the cytosol. We investigated whether PE could be used in vivo to deliver CD8+ T-cell epitopes to the MHC-class I antigen presentation pathway to trigger a specific cytotoxic T-lymphocyte (CTL) response.Amino acid 553 of PE was deleted to eliminate toxin catalytic activity, and amino acids 204-386 of ovalbumin were fused near the nontoxic PE C-terminus to produce PE(D)-OVA200. Mice were vaccinated with 100 microg of PE(D)-OVA200 3 times at 21 day intervals. Splenocytes were harvested 1 week later, and stimulated in vitro with ovalbumin expressing EG7 murine thymoma cells. In vivo tumor protection experiments were performed by vaccinating groups of mice as before, followed by a lethal dose of ovalbumin expressing tumor cells (MO5) injected subcutaneously.Splenocytes from PE(D)-OVA200 vaccinated mice lysed (51)Cr labeled EG7 cells but not the untransfected EL4 parent cell line, whereas splenocytes from mice immunized with PBS, PE(D), or ovalbumin were unable to lyse EG7 cells. Cytotoxicity in vitro was mediated by CD8+ T-cells. PE(D)-OVA200 vaccinated mice survived (88%) a lethal subcutaneous challenge of ovalbumin expressing MO5 cells. Depletion of CD8+ cells from PE(D)-OVA200 vaccinated mice abolished this protection, indicating that this cell population is required for tumor rejection in vivo.Our results indicate that PE(D) may be used as a vehicle to stimulate a protective CTL response to heterologous antigen in vivo." @default.
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• W2073342076 date "2003-04-01" @default.
• W2073342076 modified "2023-09-27" @default.
• W2073342076 title "CD8+ T-cell mediated tumor protection by Pseudomonas exotoxin fused to ovalbumin in C57BL/6 mice" @default.
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• W2073342076 doi "https://doi.org/10.1067/msy.2003.112" @default.
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