Abstract |
The Nef protein of HIV-1 is important for AIDS pathogenesis, but it is not targeted by current antiviral strategies. Here, we describe a single-domain antibody (sdAb) that binds to HIV-1 Nef with a high affinity (K(d) = 2 × 10(-9)M) and inhibited critical biologic activities of Nef both in vitro and in vivo. First, it interfered with the CD4 down-regulation activity of a broad panel of nef alleles through inhibition of the Nef effects on CD4 internalization from the cell surface. Second, it was able to interfere with the association of Nef with the cellular p21-activated kinase 2 as well as with the resulting inhibitory effect of Nef on actin remodeling. Third, it counteracted the Nef-dependent enhancement of virion infectivity and inhibited the positive effect of Nef on virus replication in peripheral blood mononuclear cells. Fourth, anti-Nef sdAb rescued Nef-mediated thymic CD4(+) T-cell maturation defects and peripheral CD4(+) T-cell activation in the CD4C/HIV-1(Nef) transgenic mouse model. Because all these Nef functions have been implicated in Nef effects on pathogenesis, this anti-Nef sdAb may represent an efficient tool to elucidate the molecular functions of Nef in the virus life cycle and could now help to develop new strategies for the control of AIDS.
|
Authors | Jérôme Bouchet, Stéphane E Basmaciogullari, Pavel Chrobak, Bettina Stolp, Nathalie Bouchard, Oliver T Fackler, Patrick Chames, Paul Jolicoeur, Serge Benichou, Daniel Baty |
Journal | Blood
(Blood)
Vol. 117
Issue 13
Pg. 3559-68
(Mar 31 2011)
ISSN: 1528-0020 [Electronic] United States |
PMID | 21292773
(Publication Type: Evaluation Study, Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- HIV Antibodies
- Single-Chain Antibodies
- nef Gene Products, Human Immunodeficiency Virus
- nef protein, Human immunodeficiency virus 1
|
Topics |
- Acquired Immunodeficiency Syndrome
(therapy)
- Animals
- Camelids, New World
(immunology)
- Cells, Cultured
- Embryo, Mammalian
- HIV Antibodies
(chemistry, immunology, metabolism, pharmacology)
- HeLa Cells
- Humans
- Immunotherapy
(methods)
- Jurkat Cells
- Mice
- Mice, Inbred C3H
- Mice, Transgenic
- Molecular Targeted Therapy
(methods)
- Protein Binding
- Protein Structure, Tertiary
(physiology)
- Single-Chain Antibodies
(chemistry, immunology, metabolism, pharmacology)
- nef Gene Products, Human Immunodeficiency Virus
(antagonists & inhibitors, immunology, metabolism)
|