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• W2774927467 abstract "Abstract Infusion of a simianized anti-α4β7 mAb (Rh-α4β7) just before and following SIV infection protected rhesus macaques from developing AIDS and partially from vaginal SIV acquisition. Recently, short-term treatment with Rh-α4β7 in combination with cART was found to lead to prolonged viral suppression after withdrawal of all therapeutic interventions. The humanized form of Rh-α4β7, vedolizumab, is a highly effective treatment for inflammatory bowel disease. To clarify the mechanism of action of Rh-α4β7, naive macaques were infused with Rh-α4β7 and sampled in blood and tissues before and after treatment to monitor several immune cell subsets. In blood, Rh-α4β7 increased the CD4+ and CD8+ T cell counts, but not B cell counts, and preferentially increased CCR6+ subsets while decreasing CD103+ and CD69+ lymphocytes. In mucosal tissues, surprisingly, Rh-α4β7 did not impact integrin α4+ cells, but decreased the frequencies of CCR6+ and CD69+ CD4+ T cells and, in the gut, Rh-α4β7 transiently decreased the frequency of memory and IgA+ B cells. In summary, even in the absence of inflammation, Rh-α4β7 impacted selected immune cell subsets in different tissues. These data provide new insights into the mechanisms by which Rh-α4β7 may mediate its effect in SIV-infected macaques with implications for understanding the effect of treatment with vedolizumab in patients with inflammatory bowel disease." @default.
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• W2774927467 date "2018-01-15" @default.
• W2774927467 modified "2023-10-16" @default.
• W2774927467 title "Integrin α4β7 Blockade Preferentially Impacts CCR6+ Lymphocyte Subsets in Blood and Mucosal Tissues of Naive Rhesus Macaques" @default.
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• W2774927467 doi "https://doi.org/10.4049/jimmunol.1701150" @default.
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