PMID- 17182696 OWN - NLM STAT- MEDLINE DCOM- 20070327 LR - 20181113 IS - 0022-538X (Print) IS - 1098-5514 (Electronic) IS - 0022-538X (Linking) VI - 81 IP - 5 DP - 2007 Mar TI - Dendritic cell-mediated trans-enhancement of human immunodeficiency virus type 1 infectivity is independent of DC-SIGN. PG - 2519-23 AB - Dendritic cells (DCs) enhance human immunodeficiency virus type 1 (HIV-1) infection of CD4(+) T lymphocytes in trans. The C-type lectin DC-SIGN, expressed on DCs, binds to the HIV-1 envelope glycoprotein gp120 and confers upon some cell lines the capacity to enhance trans-infection. Using a short hairpin RNA approach, we demonstrate that DC-SIGN is not required for efficient trans-enhancement by DCs. In addition, the DC-SIGN ligand mannan and an anti-DC-SIGN antibody did not inhibit DC-mediated enhancement. HIV-1 particles were internalized and were protected from protease treatment following binding to DCs, but not from binding to DC-SIGN-expressing Raji cells. Thus, DC-SIGN is not required for DC-mediated trans-enhancement of HIV infectivity. FAU - Boggiano, Cesar AU - Boggiano C AD - Molecular Pathogenesis Program, Skirball Institute of Biomolecular Medicine, New York University School of Medicine, 540 First Avenue, New York, NY 10016, USA. FAU - Manel, Nicolas AU - Manel N FAU - Littman, Dan R AU - Littman DR LA - eng PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't DEP - 20061220 PL - United States TA - J Virol JT - Journal of virology JID - 0113724 RN - 0 (Cell Adhesion Molecules) RN - 0 (DC-specific ICAM-3 grabbing nonintegrin) RN - 0 (HIV Envelope Protein gp120) RN - 0 (Lectins, C-Type) RN - 0 (Receptors, Cell Surface) RN - 0 (Recombinant Proteins) RN - 147336-22-9 (Green Fluorescent Proteins) RN - 9007-49-2 (DNA) SB - IM MH - Base Sequence MH - Cell Adhesion Molecules/genetics/*physiology MH - DNA/genetics MH - Dendritic Cells/*immunology/*virology MH - Fetal Blood/cytology MH - Gene Expression MH - Green Fluorescent Proteins/genetics/metabolism MH - HIV Envelope Protein gp120/physiology MH - HIV Infections/immunology/virology MH - HIV-1/*immunology/*pathogenicity MH - Humans MH - In Vitro Techniques MH - Infant, Newborn MH - Lectins, C-Type/genetics/*physiology MH - Receptors, Cell Surface/genetics/*physiology MH - Recombinant Proteins/genetics/metabolism PMC - PMC1865951 EDAT- 2006/12/22 09:00 MHDA- 2007/03/28 09:00 PMCR- 2007/07/01 CRDT- 2006/12/22 09:00 PHST- 2006/12/22 09:00 [pubmed] PHST- 2007/03/28 09:00 [medline] PHST- 2006/12/22 09:00 [entrez] PHST- 2007/07/01 00:00 [pmc-release] AID - JVI.01661-06 [pii] AID - 1661-06 [pii] AID - 10.1128/JVI.01661-06 [doi] PST - ppublish SO - J Virol. 2007 Mar;81(5):2519-23. doi: 10.1128/JVI.01661-06. Epub 2006 Dec 20.