title: Inhibition of HIV-1 transmission in trans from dendritic cells to CD4+ T lymphocytes by natural antibodies to the CRD domain of DC-SIGN purified from breast milk and intravenous immunoglobulins.
abstract: The present study demonstrates that human breast milk and normal human polyclonal immunoglobulins purified from plasma [intravenous immunoglobulins (IVIg)] contain functional natural immunoglobulin A (IgA) and IgG antibodies directed against the carbohydrate recognition domain (CRD) domain of the dendritic cell-specific intercellular adhesion molecule-3-grabbing non-integrin (DC-SIGN) molecule, which is involved in the binding of human immunodeficiency virus (HIV)-1 to dendritic cells (DCs). Antibodies to DC-SIGN CRD were affinity-purified on a matrix to which a synthetic peptide corresponding to the N-terminal CRD domain (amino-acid 342-amino-acid 371) had been coupled. The affinity-purified antibodies bound to the DC-SIGN peptide and to the native DC-SIGN molecule expressed by HeLa DC-SIGN+ cells and immature monocyte-derived dendritic cells (iMDDCs), in a specific and dose-dependent manner. At an optimal dose of 200 microg/ml, natural antibodies to DC-SIGN CRD peptide purified from breast milk and IVIg stained 25 and 20% of HeLa DC-SIGN+ cells and 32 and 12% of iMDDCs, respectively. Anti-DC-SIGN CRD peptide antibodies inhibited the attachment of virus to HeLa DC-SIGN by up to 78% and the attachment to iMDDCs by only 20%. Both breast milk- and IVIg-derived natural antibodies to the CRD peptide inhibited 60% of the transmission in trans of HIV-1(JRCSF), an R5-tropic strain, from iMDDCs to CD4+ T lymphocytes. Taken together, these observations suggest that the attachment of HIV to DCs and transmission in trans to autologous CD4+ T lymphocytes occur through two independent mechanisms. Our data support a role of natural antibodies to DC-SIGN in the modulation of postnatal HIV transmission through breast-feeding and in the natural host defence against HIV-1 in infected individuals.
authors.affiliation: Unité INSERM U743, Equipe Immunité et Biothérapie Muqueuse, Centre de Recherches Biomédicales des Cordeliers, Paris, France.
authors.forename: Mary
authors.initials: M
authors.lastname: Requena
authors.forename: Hicham
authors.initials: H
authors.lastname: Bouhlal
authors.forename: Nadine
authors.initials: N
authors.lastname: Nasreddine
authors.forename: Hela
authors.initials: H
authors.lastname: Saidi
authors.forename: Jean-Chrysostome
authors.initials: JC
authors.lastname: Gody
authors.forename: Sylvie
authors.initials: S
authors.lastname: Aubry
authors.forename: Gérard
authors.initials: G
authors.lastname: Grésenguet
authors.forename: Michel D
authors.initials: MD
authors.lastname: Kazatchkine
authors.forename: Rafick-Pierre
authors.initials: RP
authors.lastname: Sekaly
authors.forename: Laurent
authors.initials: L
authors.lastname: Bélec
authors.forename: Hakim
authors.initials: H
authors.lastname: Hocini
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000821:virology*; D015815:Cell Adhesion Molecules / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology / Q000821:virology*; D015658:HIV Infections / Q000276:immunology* / Q000635:transmission; D015497:HIV-1 / Q000502:physiology; D006367:HeLa Cells; D006801:Humans; D007113:Immunity, Innate; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D016756:Immunoglobulins, Intravenous / Q000276:immunology; D037181:Lectins, C-Type / Q000276:immunology*; D008895:Milk, Human / Q000276:immunology; D011956:Receptors, Cell Surface / Q000276:immunology*; D053585:Virus Attachment; D000099215:DC-Specific ICAM-3 Grabbing Nonintegrin
chemical_list: D015815:Cell Adhesion Molecules; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D016756:Immunoglobulins, Intravenous; D037181:Lectins, C-Type; D011956:Receptors, Cell Surface; D000099215:DC-Specific ICAM-3 Grabbing Nonintegrin