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Changes in antigen expression on B lymphocytes during HIV infection
L Ginaldi1, M De Martinis, A D'Ostilio
1Department of Internal Medicine and Public Health, University of L'Aquila, Italy. ginaldi@sgol.it
Summary
HIV infection alters B cell surface markers, with CD20 increasing and HLA-DR/CD21 decreasing, correlating with disease progression and immune deficiency. These changes offer insights into B cell defects and potential bacterial infections in HIV patients.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- B cell involvement is crucial in HIV-induced immune deficiency.
- Understanding B cell antigen expression changes can serve as surrogate markers for functional aspects in HIV infection.
Purpose of the Study:
- To identify specific antigen expression changes on B lymphocytes in HIV infection.
- To correlate these changes with disease stage and immune activation markers.
Main Methods:
- Quantitative flow cytometry was used to measure surface marker expression (HLA-DR, CD19, CD20, CD21, CD22) on B cells from HIV+ patients and controls.
- Antibody-binding capacity (ABC) was determined using standard beads.
- Results were correlated with CD4 counts and immune activation markers.
Main Results:
- CD20 expression was significantly increased on B cells from HIV+ individuals.
- B cells from HIV+ patients showed significantly lower expression of HLA-DR and CD21.
- CD20 expression changes correlated with disease stage, particularly in individuals with <200 CD4 T cells/microl.
Conclusions:
- B lymphocytes in HIV infection exhibit specific, measurable changes in receptor density.
- These antigen expression modulations are linked to disease progression and may contribute to humoral abnormalities and increased susceptibility to bacterial infections.
- Quantitative flow cytometry of B cell antigen density can enhance clinical and biological studies of HIV infection.