Detection of intracellular HIV-1 Rev protein by flow cytometry

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• The Rev trans-activator protein is crucial for human immunodeficiency virus type 1 (HIV-1) replication, regulating viral structural protein expression.
• Accurate quantification of intracellular Rev protein levels is essential for understanding HIV-1 pathogenesis and developing therapeutic strategies.

Purpose of the Study:

• To develop and validate a quantitative flow cytometry assay for intracellular steady-state levels of HIV-1 Rev proteins (wild type and RevM10).
• To compare different fixation and permeabilization techniques for optimizing Rev protein detection.
• To assess the applicability of the assay for various cell types and HIV-1 infection models.

Main Methods:

• Quantitative flow cytometry assay development.
• Comparison of three distinct fixation and permeabilization protocols.
• Detection of intracellular Rev wild type and RevM10 proteins.
• Detection of HIV-Tat protein as a secondary validation.

Main Results:

• The developed flow cytometry assay effectively quantifies intracellular Rev protein levels.
• Different fixation and permeabilization methods impact signal magnitude and population discrimination.
• The assay is applicable to diverse cell types, including primary cells and cell lines, infected with HIV-1.
• The assay successfully detected a second intracellular protein, HIV-Tat.

Conclusions:

• A robust flow cytometry assay for quantifying intracellular HIV-1 Rev proteins has been established.
• This assay is a valuable tool for analyzing Rev expression in HIV-infected cells.
• The assay can aid in optimizing the delivery of the RevM10 gene for gene therapy applications in HIV-1 treatment.