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Activation of the lectin DC-SIGN induces an immature dendritic cell phenotype triggering Rho-GTPase activity required for HIV-1 replication.

Abstract : DC-SIGN, a C-type lectin expressed on dendritic cells (DCs), can sequester human immunodeficiency virus (HIV) virions in multivesicular bodies. Here, using large-scale gene expression profiling and tyrosine-phosphorylated proteome analyses, we characterized signaling mediated by DC-SIGN after activation by either HIV or a DC-SIGN-specific antibody. Activation of DC-SIGN resulted in downregulation of genes encoding major histocompatibility complex class II, Jagged 1 and interferon-response molecules and upregulation of the gene encoding transcription factor ATF3. Phosphorylated proteome analysis showed that HIV- or antibody-stimulated DC-SIGN signaling was mediated by the Rho guanine nucleotide-exchange factor LARG and led to increased Rho-GTPase activity. Activation of LARG in DCs exposed to HIV was required for the formation of virus-T cell synapses. Thus, HIV sequestration by and stimulation of DC-SIGN helps HIV evade immune responses and spread to cells.
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https://hal-pasteur.archives-ouvertes.fr/pasteur-00292841
Contributor : Mireille Gau <>
Submitted on : Wednesday, July 2, 2008 - 4:43:13 PM
Last modification on : Monday, January 13, 2020 - 5:08:10 PM

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Ashleigh Hodges, Katherine Sharrocks, Mariola Edelmann, Dilair Baban, Arnaud Moris, et al.. Activation of the lectin DC-SIGN induces an immature dendritic cell phenotype triggering Rho-GTPase activity required for HIV-1 replication.. Nature Immunology, Nature Publishing Group, 2007, 8 (6), pp.569-77. ⟨10.1038/ni1470⟩. ⟨pasteur-00292841⟩

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