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2003:
Brandão Joana G; Scheper Rik J; Lougheed Sinéad M; Curiel David T; Tillman Bryan W; Gerritsen Winald R; van den Eertwegh Alfons J M; Pinedo Herbert M; Haisma Hidde J; de Gruijl Tanja D
CD40-targeted adenoviral gene transfer to dendritic cells through the use of a novel bispecific single-chain Fv antibody enhances cytotoxic T cell activation.
Vaccine 2003;
21(
19-20):.
Adenoviral (Ad) transduction of dendritic cells (DC) is a promising vaccination strategy. However, clinical applicability of Ad vectors is hampered by the necessity to use high titers of infectious Ad particles for efficient DC transduction. Here, we report on the production of a bacterially expressed bispecific conjugate, consisting of a fusion of recombinant single-chain (sc) mAb Fv fragments, which bind and neutralize the Ad fiber knob (through the S11 mAb scFv) and retarget Ad to CD40 on the DC surface (through the G28-5 mAb scFv). We show that this bispecific scFv fusion protein significantly enhances transduction efficiency of monocyte-derived DC (MoDC), reduces the amount of virus needed for a given level of transduction, and increases the ability of MoDC to activate CTL in an antigen specific manner. This single-component conjugate may prove to be a valuable immunotherapeutic tool for the targeting of Ad to DC in vivo.
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