Invariant NKT (iNKT) cells are innate-like T cells that respond rapidly with a broad range of effector functions upon recognition of glycolipid Ags presented by CD1d. HIV-1 carries Nef-and Vpu-dependent mechanisms to interfere with CD1d surface expression, indirectly suggesting a role for iNKT cells in control of HIV-1 infection. In this study, we investigated whether iNKT cells can participate in the innate cell-mediated immune response to HIV-1. Infection of dendritic cells (DCs) with Nef-and Vpudeficient HIV-1 induced upregulation of CD1d in a TLR7-dependent manner. Infection of DCs caused modulation of enzymes in the sphingolipid pathway and enhanced expression of the endogenous glucosylceramide Ag. Importantly, iNKT cells responded specifically to rare DCs productively infected with Nef-and Vpu-defective HIV-1. Transmitted founder viral isolates differed in their CD1d downregulation capacity, suggesting that diverse strains may be differentially successful in inhibiting this pathway. Furthermore, both iNKT cells and DCs expressing CD1d and HIV receptors resided in the female genital mucosa, a site where HIV-1 transmission occurs. Taken together, these findings suggest that innate iNKT cell sensing of HIV-1 infection in DCs is an early immune detection mechanism, which is independent of priming and adaptive recognition of viral Ag, and is actively targeted by Nef-and Vpu-dependent viral immune evasion mechanisms.

Innate invariant NKT cell recognition of HIV-1-infected dendritic cells is an early detection mechanism targeted by viral immune evasion / D. Paquin-Proulx, A. Gibbs, S.M. Bachle, A. Checa, A. Introini, E. Leeansyah, C.E. Wheelock, D.F. Nixon, K. Broliden, A. Tjernlund, M. Moll, J.K. Sandberg. - In: JOURNAL OF IMMUNOLOGY. - ISSN 0022-1767. - 197:5(2016), pp. 1843-1851. [10.4049/jimmunol.1600556]

Innate invariant NKT cell recognition of HIV-1-infected dendritic cells is an early detection mechanism targeted by viral immune evasion

A. Introini;
2016

Abstract

Invariant NKT (iNKT) cells are innate-like T cells that respond rapidly with a broad range of effector functions upon recognition of glycolipid Ags presented by CD1d. HIV-1 carries Nef-and Vpu-dependent mechanisms to interfere with CD1d surface expression, indirectly suggesting a role for iNKT cells in control of HIV-1 infection. In this study, we investigated whether iNKT cells can participate in the innate cell-mediated immune response to HIV-1. Infection of dendritic cells (DCs) with Nef-and Vpudeficient HIV-1 induced upregulation of CD1d in a TLR7-dependent manner. Infection of DCs caused modulation of enzymes in the sphingolipid pathway and enhanced expression of the endogenous glucosylceramide Ag. Importantly, iNKT cells responded specifically to rare DCs productively infected with Nef-and Vpu-defective HIV-1. Transmitted founder viral isolates differed in their CD1d downregulation capacity, suggesting that diverse strains may be differentially successful in inhibiting this pathway. Furthermore, both iNKT cells and DCs expressing CD1d and HIV receptors resided in the female genital mucosa, a site where HIV-1 transmission occurs. Taken together, these findings suggest that innate iNKT cell sensing of HIV-1 infection in DCs is an early immune detection mechanism, which is independent of priming and adaptive recognition of viral Ag, and is actively targeted by Nef-and Vpu-dependent viral immune evasion mechanisms.
Antigens, CD1d; Dendritic Cells; Female; Gene Products, nef; Glucosylceramides; HEK293 Cells; HIV Antigens; HIV Infections; HIV-1; Human Immunodeficiency Virus Proteins; Humans; Immunity, Cellular; Killer Cells, Natural; Lymphocyte Activation; Natural Killer T-Cells; Toll-Like Receptor 7; Viral Regulatory and Accessory Proteins; Antigen Presentation; Immune Evasion
Settore MED/04 - Patologia Generale
Settore BIO/13 - Biologia Applicata
Settore MED/50 - Scienze Tecniche Mediche Applicate
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/871281
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