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- W2009968900 abstract "Adeno-associated viral (AAV) vectors hold great potential for liver-directed gene therapy. Stable and high levels of transgene expression have been achieved in many murine models. Systemic delivery of AAV vectors in nonhuman primates (NHPs) that are natural hosts of AAVs appear to be challenging due to the high prevalence of pre-existing neutralizing antibodies (NAbs). This study evaluates the performance of AAV8, hu.37, and rh.8 vectors expressing green fluorescent protein (GFP) from a liver-specific promoter in rhesus macaques. Two of the animals that received AAV8 showed transduction of 24 and 40% of hepatocytes 7 days after systemic vector delivery. Importantly, expression was detected in several animals after 35 days despite the elevation of liver enzymes and development of transgene-specific T cells in liver. Pre-existing low levels of NAbs profoundly impacted the outcome of gene transfer and redirected vector DNA to spleen. We developed a sensitive in vivo passive transfer assay to detect low levels of NAbs to these novel AAV serotypes. Other strategies need to be developed to reduce immune response to the transgene in order to maintain long-term gene expression. Adeno-associated viral (AAV) vectors hold great potential for liver-directed gene therapy. Stable and high levels of transgene expression have been achieved in many murine models. Systemic delivery of AAV vectors in nonhuman primates (NHPs) that are natural hosts of AAVs appear to be challenging due to the high prevalence of pre-existing neutralizing antibodies (NAbs). This study evaluates the performance of AAV8, hu.37, and rh.8 vectors expressing green fluorescent protein (GFP) from a liver-specific promoter in rhesus macaques. Two of the animals that received AAV8 showed transduction of 24 and 40% of hepatocytes 7 days after systemic vector delivery. Importantly, expression was detected in several animals after 35 days despite the elevation of liver enzymes and development of transgene-specific T cells in liver. Pre-existing low levels of NAbs profoundly impacted the outcome of gene transfer and redirected vector DNA to spleen. We developed a sensitive in vivo passive transfer assay to detect low levels of NAbs to these novel AAV serotypes. Other strategies need to be developed to reduce immune response to the transgene in order to maintain long-term gene expression." @default.
- W2009968900 created "2016-06-24" @default.
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- W2009968900 date "2010-01-01" @default.
- W2009968900 modified "2023-10-17" @default.
- W2009968900 title "The Pleiotropic Effects of Natural AAV Infections on Liver-directed Gene Transfer in Macaques" @default.
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- W2009968900 doi "https://doi.org/10.1038/mt.2009.245" @default.
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