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Updated: Jul 15, 2026
05:46
Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
Published on: April 9, 2014
Entry inhibitor-based microbicides are active in vitro against HIV-1 isolates from multiple genetic subtypes
Thomas J Ketas1, Susan M Schader, Juan Zurita
1Dept of Microbiology and Immunology, Weill Medical College of Cornell University, New York, NY 10021, USA.
Virology
|April 13, 2007
Summary
Combining HIV-1 entry inhibitors like BMS-C, CMPD167, C52L, and AMD3465 shows promise for topical microbicides. Combinations proved more effective than single agents against diverse HIV-1 variants, enhancing microbicide potential.
Area of Science:
- Virology
- Immunology
- Pharmacology
Background:
- Topical microbicides are being developed to prevent HIV-1 sexual transmission.
- Current strategies focus on inhibitors of viral entry, such as those targeting HIV-1 gp120, CCR5, or fusion.
- Broad-spectrum activity against diverse HIV-1 variants is crucial for microbicide effectiveness.
Purpose of the Study:
- To evaluate the efficacy of individual and combined HIV-1 entry inhibitors against various primary HIV-1 isolates.
- To determine if combinations of entry inhibitors can overcome limitations of single agents against multiple HIV-1 variants.
Main Methods:
- Tested BMS-C (gp120 inhibitor), CMPD167 (CCR5 inhibitor), C52L (fusion inhibitor), and AMD3465 (CXCR4 ligand) alone and in combination.
- Assessed inhibition of viral replication against 25 R5, 12 X4, and 7 R5X4 primary HIV-1 isolates from subtypes A-G in human lymphocytes.
Main Results:
- At high concentrations, individual inhibitors showed >90% inhibition of most R5 isolates.
- Combinations of inhibitors were more effective than single agents at lower concentrations against R5 and X4 viruses.
- R5X4 viruses were effectively inhibited by combining AMD3465 with CMPD167 or by coreceptor-independent compounds.
Conclusions:
- Combining HIV-1 entry inhibitors may enhance microbicide effectiveness against a broader range of HIV-1 variants.
- Combination therapy could provide a more robust strategy for preventing sexual transmission of HIV-1.
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