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• W2102068249 abstract "ABSTRACT Molecular differences in the envelope glycoproteins of human immunodeficiency virus type 1 and simian immunodeficiency virus (SIV) determine virus infectivity and cellular tropism. To examine how these properties contribute to productive infection in vivo, rhesus macaques were inoculated with strains of single-cycle SIV (scSIV) engineered to express three different envelope glycoproteins with full-length (TM open ) or truncated (TM stop ) cytoplasmic tails. The 239 envelope uses CCR5 for infection of memory CD4 + T cells, the 316 envelope also uses CCR5 but has enhanced infectivity for primary macrophages, and the 155T3 envelope uses CXCR4 for infection of both naive and memory CD4 + T cells. Separate groups of six rhesus macaques were inoculated intravenously with mixtures of TM open and TM stop scSIV mac 239, scSIV mac 316, and scSIV mac 155T3. A multiplex real-time PCR assay specific for unique sequence tags engineered into each virus was then used to measure viral loads for each strain independently. Viral loads in plasma peaked on day 4 for each strain and were resolved below the threshold of detection within 4 to 10 weeks. Truncation of the envelope cytoplasmic tail significantly increased the peak of viremia for all three envelope variants and the titer of SIV-specific antibody responses. Although peak viremias were similar for both R5- and X4-tropic viruses, clearance of scSIV mac 155T3 TM stop was significantly delayed relative to the other strains, possibly reflecting the infection of a CXCR4 + cell population that is less susceptible to the cytopathic effects of virus infection. These studies reveal differences in the peaks and durations of a single round of productive infection that reflect envelope-specific differences in infectivity, chemokine receptor specificity, and cellular tropism." @default.
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• W2102068249 date "2008-01-01" @default.
• W2102068249 modified "2023-10-18" @default.
• W2102068249 title "Comparison of Plasma Viremia and Antibody Responses in Macaques Inoculated with Envelope Variants of Single-Cycle Simian Immunodeficiency Virus Differing in Infectivity and Cellular Tropism" @default.
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• W2102068249 doi "https://doi.org/10.1128/jvi.01094-07" @default.
• W2102068249 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2224382" @default.
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