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A method to analyze the interaction between gp120 of human immunodeficiency virus and CD4
P Lanza1, L C Washington, M Zanetti
1Department of Medicine, University of California, San Diego.
Insights
This study introduces a new in vitro assay to screen for human immunodeficiency virus (HIV) inhibitors by measuring the interaction between HIV
Area of Science:
- Virology
- Immunology
- Biochemistry
Background:
- The interaction between human immunodeficiency virus (HIV) glycoprotein 120 (gp120) and its receptor CD4 is crucial for viral entry.
- Developing methods to study this interaction is vital for identifying potential therapeutic targets.
Purpose of the Study:
- To present a novel in vitro assay for investigating the gp120-CD4 interaction.
- To establish a reproducible and rapid method for screening pharmacological inhibitors of this interaction.
Main Methods:
- Utilizing the 8E5 human T cell line, which expresses gp120 on its surface.
- Employing soluble recombinant CD4 binding to cell-surface gp120.
- Detecting CD4-gp120 binding via immunofluorescence using a monoclonal antibody to CD4.
Main Results:
- The assay successfully detected CD4 binding to gp120 on the 8E5 cell line.
- Binding was inhibited by substances such as dextran sulfate, heparin, and pentosan polysulfate.
- The antibody Leu3a did not inhibit binding, with reasons for this discrepancy discussed.
Conclusions:
- The developed assay is a simple, reproducible, and rapid method for screening inhibitors of the gp120/CD4 interaction.
- This assay can aid in the discovery of new pharmacological agents targeting HIV entry.
Abstract:
The study presents a new in vitro method to investigate the interaction between the glycoprotein (gp)120 of human immunodeficiency virus (HIV) and its receptor, CD4. The method is based on the binding of soluble recombinant CD4 to a human T cell line, 8E5, which constitutively expresses gp120 at its surface as a result of infection with HIV (LAV) and lacks reverse transcriptase activity. The binding of CD4 to gp120 on the cell surface is revealed by immunofluorescence using a murine monoclonal antibody to CD4. Binding can be inhibited by different substances like dextran sulfate, heparin, pentosan polysulfate, but not Leu3a. The reasons for this discrepancy are discussed. We propose this assay as a simple, reproducible, and rapid new method to screen new, pharmacological inhibitors of the gp120/CD4 interaction.