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Journal of Virology, February 2005, p. 2124-2132, Vol. 79, No. 4
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.4.2124-2132.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Center for Neurovirology and Neurodegenerative Disorders and Departments of Pharmacology,1 Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska, and Departments of,5 Microbiology and Immunology,2 Neurology,3 Center for Aging and Developmental Biology, Cancer Center, University of Rochester Medical Center, Rochester, New York4
Received 26 July 2004/ Accepted 30 September 2004
Small-animal models are needed to test human immunodeficiency virus (HIV) vaccine efficacy following viral challenge. To this end, we examined HIV-1-specific immune responses following immunization of nonobese diabetic-severe combined immunodeficient mice that were repopulated with human peripheral blood lymphocytes (hu-PBL-NOD/SCID mice). Autologous dendritic cells (DC) were transduced ex vivo with replication-defective, helper virus-free, herpes simplex virus type 1 (HSV-1) amplicons that expressed HIV-1 gp120 and were then injected into the hu-PBL-NOD/SCID mice. This resulted in primary HIV-1-specific humoral and cellular immune responses. Serum samples from vaccinated animals contained human immunoglobulin G that reacted with HIV-1 Env proteins by enzyme-linked immunosorbent assay and neutralized the infectivity of HIV-1 LAI and ADA strains. T cells isolated from the mice responded to viral antigens by producing gamma interferon when analyzed by enzyme-linked immunospot assay. Importantly, exposure of the vaccinated animals to infectious HIV-1 demonstrated partial protection against infectious HIV-1 challenge. This was reflected by a reduction in HIV-1ADA and by protection of the engrafted human CD4+ T lymphocytes against HIV-1LAI-induced cytotoxicity. These data demonstrate that transduction of DC by HSV amplicon vectors expressing HIV-1 gp120 induce virus-specific immune responses in hu-PBL-NOD/SCID mice. This mouse model may be a useful tool to evaluate human immune responses and protection against viral infection following vaccination.
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