Woodchuck dendritic cells generated from peripheral blood mononuclear cells and transduced with recombinant human adenovirus serotype 5 induce antigen-specific cellular immune responses
Ochoa-Callejero L, Berraondo P, Crettaz J, Olagüe C, Vales A, Ruiz J, Prieto J, Tennant BC, Menne S, González-Aseguinolaza G.
Woodchucks infected with the woodchuck hepatitis virus (WHV) is the best available animal model for testing the immunotherapeutic effects of dendritic cells (DCs) in the setting of a chronic infection, as woodchucks develop a persistent infection resembling that seen in humans infected with the hepatitis B virus.
In the present study, DCs were generated from woodchuck peripheral blood mononuclear cells (wDCs) in the presence of human granulocyte macrophage colony-stimulating factor (hGM-CSF) and human interleukin 4 (hIL-4). After 7 days of culture, cells with morphology similar to DCs were stained positively with a cross-reactive anti-human CD86 antibody. Functional analysis showed that uptake of FITC-dextran by wDCs was very efficient and was partially inhibited after LPS-induced maturation. Furthermore, wDCs stimulated allogenic lymphocytes and induced proliferation. Moreover, wDCs were transduced efficiently with a human adenovirus serotype 5 for the expression of beta-galactosidase.
Following transduction and in vivo administration of such DCs into woodchucks, an antigen-specific cellular immune response was induced.
These results demonstrate that wDCs can be generated from the peripheral blood. Following transfection with a recombinant adenovirus wDCs can be used as a feasible and effective tool for eliciting WHV-specific T-cell responses indicating their potential to serve as prophylactic and therapeutic vaccines.