Sialic acid-binding Ig-like lectin-7 interacts with HIV-1 gp120 and facilitates infection of CD4posT cells and macrophages
Open Access
- 13 December 2013
- journal article
- Published by Springer Science and Business Media LLC in Retrovirology
- Vol. 10 (1), 154
- https://doi.org/10.1186/1742-4690-10-154
Abstract
Sialic acid-binding Ig-like lectin-7 (Siglec-7) expression is strongly reduced on natural killer (NK) cells from HIV-1 infected viremic patients. To investigate the mechanism(s) underlying this phenomenon, we hypothesized that Siglec-7 could contribute to the infection of CD4pos target cells following its interaction with HIV-1 envelope (Env) glycoprotein 120 (gp120). The ability of Siglec-7 to bind gp120 Env in a sialic acid-dependent manner facilitates the infection of both T cells and monocyte-derived macrophages (MDMs). Indeed, pre-incubation of HIV-1 with soluble Siglec-7 (sSiglec-7) increases the infection rate of CD4pos T cells, which do not constitutively express Siglec-7. Conversely, selective blockade of Siglec-7 markedly reduces the degree of HIV-1 infection in Siglec-7pos MDMs. Finally, the sSiglec-7 amount is increased in the serum of AIDS patients with high levels of HIV-1 viremia and inversely correlates with CD4pos T cell counts. Our results show that Siglec-7 binds HIV-1 and contributes to enhance the susceptibility to infection of CD4pos T cells and MDMs. This phenomenon plays a role in HIV-1 pathogenesis and in disease progression, as suggested by the inverse correlation between high serum level of sSiglec-7 and the low CD4pos T cell count observed in AIDS patients in the presence of chronic viral replication.Keywords
This publication has 61 references indexed in Scilit:
- Redefining the Viral Reservoirs that Prevent HIV-1 EradicationImmunity, 2012
- Evolution of CD33-related siglecs: regulating host immune functions and escaping pathogen exploitation?Immunology, 2010
- Immune responses to HIV and SIV in mucosal tissues: ‘location, location, location’Current Opinion in HIV and AIDS, 2010
- Sialic acids acquired by Pseudomonas aeruginosa are involved in reduced complement deposition and siglec mediated host‐cell recognitionFEBS Letters, 2009
- Glycosylation Site-Specific Analysis of Clade C HIV-1 Envelope ProteinsJournal of Proteome Research, 2009
- Syndecan-3 is a dendritic cell-specific attachment receptor for HIV-1Proceedings of the National Academy of Sciences of the United States of America, 2007
- Siglecs and their roles in the immune systemNature Reviews Immunology, 2007
- Microbial translocation is a cause of systemic immune activation in chronic HIV infectionNature Medicine, 2006
- Sialic Acid-Binding Immunoglobulin-Like Lectin 7 Mediates Selective Recognition of Sialylated Glycans Expressed on Campylobacter jejuni LipooligosaccharidesInfection and Immunity, 2006
- Involvement of macrophage mannose receptor in the binding and transmission of HIV by macrophagesEuropean Journal of Immunology, 2003