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Antibodies to p24 antigen do not specifically detect HIV-infected lymphocytes in AIDS patients
1Abteilung Virologie, Universität Freiburg, Germany.
Insights
The p24 antigen flow cytometric assay (FCA) is not specific for detecting HIV-infected peripheral blood mononuclear cells (PBMC) in patients. This assay shows non-specific staining and fails to accurately quantify HIV infection in patient samples.
Area of Science:
- Immunology
- Virology
- Biotechnology
Background:
- Flow cytometric assay (FCA) for p24 antigen detection is used to analyze HIV infection.
- Previous studies suggest its utility in detecting HIV-infected cell lines and patient peripheral blood mononuclear cells (PBMC).
Purpose of the Study:
- To evaluate the specificity and utility of the p24 antigen flow cytometric assay (FCA) for detecting HIV-infected PBMC in patients.
- To determine if p24-FCA can accurately quantify HIV infection in clinical samples.
Main Methods:
- Utilized flow cytometry to detect p24 antigen in HIV-infected cell lines and patient PBMC.
- Employed isotype control antibodies for comparative staining analysis.
- Performed fluorescence-activated cell sorting (FACS) to purify CD4+p24+ and CD4+p24- lymphocyte fractions.
Main Results:
- The p24-FCA demonstrated non-specific staining of PBMC from HIV-infected patients, even with isotype control antibodies.
- CD4-negative lymphocytes, typically not infected with HIV, also stained positive for p24.
- FACS-purified CD4+p24+ lymphocytes did not show enrichment of HIV-infected cells compared to CD4+p24- fractions.
Conclusions:
- The p24 antigen flow cytometric assay is not a specific or reliable method for determining the percentage of HIV-infected PBMC in individuals.
- The assay's lack of specificity limits its application in diagnosing or monitoring HIV infection in patient samples.
Abstract:
A flow cytometric assay (FCA), which detects the p24 antigen in HIV-infected cell lines and in peripheral blood mononuclear cells (PBMC) of AIDS patients, has been described in several studies. However, the results presented here clearly show that this p24-FCA, although useful for the analysis of HIV infection of cells in vitro, does not specifically detect HIV-infected PBMC from patients. Isotype control antibodies also stained PBMC from HIV-infected patients to a greater degree than the PBMC from healthy controls. Furthermore, the CD4-negative lymphocytes, which are generally not infected with HIV, were also found to stain with anti-p24. Finally, no enrichment of HIV-infected cells was found in the FACS-purified CD4+p24+ lymphocytes, compared to the CD4+p24- cell fraction. The p24-FCA, therefore, was not useful for determining the percentage of infected PBMCs from HIV-infected individuals.
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