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• W4382181693 abstract "C-C chemokine receptor 5 (CCR5) is a major coreceptor for Human immunodeficiency virus (HIV) and simian immunodeficiency virus (SIV) cell entry; however, its role in brain pathogenesis is largely understudied. Thus, we sought to examine cell type-specific protein expression of CCR5 during SIV infection of the brain.We examined occipital cortical tissue from uninfected rhesus macaques and SIV-infected animals with or without encephalitis using immunohistochemistry and immunofluorescence microscopy to determine the number and distribution of CCR5-positive cells.An increase in the number of CCR5+ cells in the brain of SIV-infected animals with encephalitis was accounted for by increased CD3+CD8+ cells expressing CCR5, but not by increased CCR5+ microglia or perivascular macrophages (PVMs), and a concurrent decrease in the percentage of CCR5+ PVMs was observed. Levels of CCR5 and SIV Gag p28 protein expression were examined on a per-cell basis, and a significant, negative relationship was established indicating decreased CCR5 expression in productively infected cells. While investigating the endocytosis-mediated CCR5 internalization as a mechanism for CCR5 downregulation, we found that phospho-ERK1/2, an indicator of clathrin-mediated endocytosis, was colocalized with infected PVMs and that macrophages from infected animals showed significantly increased expression of clathrin heavy chain 1.These findings show a shift in CCR5-positive cell types in the brain during SIV pathogenesis with an increase in the number of CCR5+ CD8 T cells, and downregulated CCR5 expression on infected PVMs, likely through ERK1/2-driven, clathrin-mediated endocytosis." @default.
• W4382181693 created "2023-06-28" @default.
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• W4382181693 date "2023-06-27" @default.
• W4382181693 modified "2023-10-18" @default.
• W4382181693 title "Downregulation of CCR5 on brain perivascular macrophages in simian immunodeficiency virus‐infected rhesus macaques" @default.
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• W4382181693 doi "https://doi.org/10.1002/brb3.3126" @default.
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