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To evaluate the in vivo efficacy of gene therapy for treating human immunodeficiency virus type 1 (HIV-1) infection, a novel simian virus (SV) 40-derived vector gene delivery system that efficiently transduces human leukocytes was combined with a model using severe combined immunodeficiency mice infected with HIV-1 and implanted with human fetal thymic and liver tissue (thy/liv-SCID-hu mice). The SV40-derived vector, SV(Aw), which encodes a variable fragment antibody recognizing HIV-1 integrase (IN#33),was injected into the human thymic grafts of thy/liv-SCID-hu mice and induced IN#33 expression in most of the thymocytes in the graft. After in vivo challenge with HIV-1, IN#33 expression inhibited in vivo HIV-1 infection, as evidenced by the markedly lower number of HIV-1-infected thymocytes detected in human thymic grafts injected with the SV(Aw) vector, compared with those injected with a control SV40-derived vector. Thus, these findings demonstrate the utility of this new mouse model system for assessing the in vivo efficacy of HIV-1-specific gene therapy. In addition, these data indicate that SV40-derived vectors may provide a system capable of efficient in vivo gene delivery.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Gene Therapy Using a Simian Virus 40–Derived Vector Inhibits the Development of In Vivo Human Immunodeficiency Virus Type 1 Infection of Severe Combined Immunodeficiency Mice Implanted with Human Fetal Thymic and Liver Tissue