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• W2070116719 abstract "Previously, we showed that the Vpu protein from subtype C human immunodeficiency virus type 1 (HIV-1) was efficiently targeted to the cell surface, suggesting that this protein has biological properties that differ from the well-studied subtype B Vpu protein. In this study, we have further analyzed the biological properties of the subtype C Vpu protein. Flow cytometric analysis revealed that the subtype B Vpu (strain HXB2) was more efficient at down-regulating CD4 surface expression than the Vpu proteins from four subtype C clinical isolates. We constructed a simian-human immunodeficiency virus virus, designated as SHIV(SCVpu), in which the subtype B vpu gene from the pathogenic SHIV(KU-1bMC33) was substituted with the vpu from a clinical isolate of subtype C HIV-1 (strain C.96.BW16B01). Cell culture studies revealed that SHIV(SCVpu) replicated with slightly reduced kinetics when compared with the parental SHIV(KU-1bMC33) and that the viral Env and Gag precursor proteins were synthesized and processed similarly compared to the parental SHIV(KU-1bMC33). To determine if substitution of the subtype C Vpu protein affected the pathogenesis of the virus, three pig-tailed macaques were inoculated with SHIV(SCVpu) and circulating CD4+ T-cell levels and viral loads were monitored for up to 44 weeks. Our results show that SHIV(SCVpu) caused a more gradual decline in the rate of CD4+ T cells in pig-tailed macaques compared to those inoculated with parental subtype B SHIV(KU-1bMC33). These results show for the first time that different Vpu proteins of HIV-1 can influence the rate at which CD4+ T-cell loss occurs in the SHIV/pig-tailed macaque model." @default.
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• W2070116719 date "2008-02-01" @default.
• W2070116719 modified "2023-09-26" @default.
• W2070116719 title "Modulation of the severe CD4+ T-cell loss caused by a pathogenic simian–human immunodeficiency virus by replacement of the subtype B vpu with the vpu from a subtype C HIV-1 clinical isolate" @default.
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• W2070116719 doi "https://doi.org/10.1016/j.virol.2007.09.015" @default.
• W2070116719 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2727868" @default.
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