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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Seaman, Michael S. Yu, Jian Ochsenbauer, Christina Pace, Craig S. Franco, David Song, Ruijiang Ho, David D. Andrews, Chasity D. Oren, Deena A. |
| Description | Author Affiliation: Pace CS ( Aaron Diamond AIDS Research Center, The Rockefeller University, New York, NY 10016, USA.); |
| Abstract | In the absence of an effective HIV-1 vaccine, passive immunization using broadly neutralizing Abs or Ab-like molecules could provide an alternative to the daily administration of oral antiretroviral agents that has recently shown promise as preexposure prophylaxis. Currently, no single broadly neutralizing Ab (bNAb) or combination of bNAbs neutralizes all HIV-1 strains at practically achievable concentrations in vivo. To address this problem, we created bispecific Abs that combine the HIV-1 inhibitory activity of ibalizumab (iMab), a humanized mAb directed to domain 2 of human CD4, with that of anti-gp120 bNAbs. These bispecific bNAbs (BibNAbs) exploit iMab's potent anti-HIV-1 activity and demonstrated clinical efficacy and safety to anchor and thereby concentrate a second broadly neutralizing agent at the site of viral entry. Two BibNabs, PG9-iMab and PG16-iMab, exhibit exceptional breadth and potency, neutralizing 100% of the 118 viruses tested at low picomolar concentrations, including viruses resistant to both parental mAbs. The enhanced potency of these BibNAbs was entirely dependent on CD4 anchoring, not on membrane anchoring per se, and required optimal Ab geometry and linker length. We propose that iMab-based BibNAbs, such as PG9-iMab and PG16-iMab, are promising candidates for passive immunization to prevent HIV-1 infection. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 33 |
| Volume Number | 110 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2013-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Acquired Immunodeficiency Syndrome Prevention & Control Antibodies, Bispecific Immunology Antibodies, Monoclonal Antibodies, Neutralizing HIV Antibodies HIV-1 Immunization, Passive Pharmacology Antigens, CD4 Chromatography, Gel Cloning, Molecular Enzyme-Linked Immunosorbent Assay HIV Envelope Protein Gp120 Drug Effects Inhibitory Concentration 50 Neutralization Tests Surface Plasmon Resonance Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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