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• W1570466078 startingPage "201" @default.
• W1570466078 abstract "The expression of the collagen receptor alpha(1)beta(1) integrin (VLA-1) on CD4(+) T cells is largely restricted to CCR7(-)CD45RO(+) cells that localize to inflamed tissues. Moreover, neutralizing alpha(1) integrin, in vivo, has been shown to compromise cell-mediated immunity. Our current study shows that the expression of VLA-1 on human CD4(+) T cells is restricted to conventional effectors. In contrast, Foxp3(+) T regulatory cells (Tregs) do not express this receptor. Moreover, Foxp3 or VLA-1 expression remained a mutually exclusive event in CD4(+) T cells even upon polyclonal anti-CD3-induced activation. Because TNFalpha blockade ameliorates certain T cell-dependent autoimmune disorders in humans, we investigated, in vitro, whether neutralizing TNFalpha affected the balance between the proinflammatory VLA-1(+) effectors and the counteracting Tregs. We found that anti-CD3 stimulation of freshly isolated PBL from healthy individuals, coupled with continuous TNFalpha blockade, inhibited the typical activation-dependent generation of CD4(+)VLA-1(+) Th1 cells. In contrast, it augmented the outgrowth of VLA-1(neg/dim)CD25(high) and Foxp3(+)CD4(+) T cells. Indeed, repeated anti-CD3 stimulation coupled with TNFalpha blockade generated CD4(+) T cell lines enriched for VLA-1(-)Foxp3(+) Tregs. Importantly, these CD4(+) T cells displayed potent suppressive functions toward autologous CD4(+) PBL, including the suppression of the activation-dependent induction of VLA-1(+) effectors. Thus, we propose a novel mechanism by which anti-TNFalpha therapy may restore self-tolerance, by shifting the balance between VLA-1(+) effectors and Foxp3(+) Tregs, during immune activation, in favor of the latter suppressor cell population." @default.
• W1570466078 created "2016-06-24" @default.
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• W1570466078 date "2007-01-01" @default.
• W1570466078 modified "2023-10-18" @default.
• W1570466078 title "α1β1 Integrin+ and Regulatory Foxp3+ T Cells Constitute Two Functionally Distinct Human CD4+ T Cell Subsets Oppositely Modulated by TNFα Blockade" @default.
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• W1570466078 doi "https://doi.org/10.4049/jimmunol.178.1.201" @default.
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