Characterization of a Novel CD4 Mimetic Compound YIR-821 against HIV-1 Clinical Isolates
- Kumamoto University (Japan)
- Uniformed Services University of the Health Sciences, Bethesda, MD (United States)
- Centre de Recherche du CHUM (CRCHUM), Montreal, QC (Canada); Univ. of Montreal, QC (Canada)
- National Institutes of Biomedical Innovation, Health and Nutrition (NIBIOHN), Osaka (Japan)
- Tokyo Medical and Dental University (Japan)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
Small CD4-mimetic compound (CD4mc), which inhibits the interaction between gp120 with CD4, acts as an entry inhibitor and induces structural changes in the HIV-1 envelope glycoprotein trimer (Env) through its insertion within the Phe43 cavity of gp120. Here, we recently developed YIR-821, a novel CD4mc, that has potent antiviral activity and lower toxicity than the prototype NBD-556. To assess the possibility of clinical application of YIR-821, we tested its antiviral activity using a panel of HIV-1 pseudoviruses from different subtypes. YIR-821 displayed entry inhibitor activity against 53.5% (21/40) of the pseudoviruses tested and enhanced neutralization mediated by coreceptor binding site (CoRBS) antibodies in 50% (16/32) of these. Furthermore, when we assessed the antiviral effects using a panel of pseudoviruses and autologous plasma IgG, enhancement of antibody-mediated neutralization activity was observed for 48% (15/31) of subtype B strains and 51% (28/55) of non-B strains. The direct antiviral activity of YIR-821 as an entry inhibitor was observed in 53% of both subtype B (27/51) and non-B subtype (40/75) pseudoviruses. Enhancement of antibody-dependent cellular cytotoxicity was also observed with YIR-821 for all six selected clinical isolates, as well as for the transmitted/founder (T/F) CH58 virus-infected cells. The sequence diversity in the CD4 binding site as well as other regions, such as the gp120 inner domain layers or gp41, may be involved in the multiple mechanisms related to the sensitive/resistant phenotype of the virus to YIR-821. Our findings may facilitate the clinical application of YIR-821.
- Research Organization:
- SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Sponsoring Organization:
- Canadian Institute of Health Research Foundation (CIHR); Canadian Research Chair for Retroviral Entry; Japan Agency for Medical Research and Development (AMED); Japan Science and Technology Agency (JST); Japan Society for the Promotion of Science (JSPS) KAKENHI; National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 2423890
- Journal Information:
- Journal of Virology, Journal Name: Journal of Virology Journal Issue: 1 Vol. 97; ISSN 0022-538X; ISSN 1098-5514
- Publisher:
- American Society for MicrobiologyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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