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Apoptosis in HIV infection: protective role of IL-2
P Cordiali Fei1, M Solmone, M Viora
1Laboratory of Clinical Pathology, Istituto San Gallicano, Roma, Italy.
Abstract:
Peripheral blood mononuclear cells from HIV-infected subjects have been demonstrated by different methods to die by apoptosis after short time in culture. In the present study the percentages of apoptotic cells have been measured by propidium iodide staining and flow cytometry in PBMC from healthy controls (15) and HIV-infected subjects with asymptomatic (10) or advanced (15) disease, with or without anti-viral treatment. The percentage of apoptosis significantly correlated with clinical stage (CDCII: 15.85% +/- 9.17, CDCIV: 22.6% +/- 5.97, P < 0.001) and the CD4/CD8 CD3 cell ratio. R = -0.57, P = 0.012), while no differences were found in relation to AZT therapy. By adding IL-2 to the cultures the percentages of apoptosis of PBMC from HIV-infected patients were significantly reduced in all experiments.
Insights
Peripheral blood mononuclear cells (PBMC) from HIV patients undergo apoptosis, increasing with disease severity. Interleukin-2 (IL-2) addition significantly reduced this apoptosis in HIV-infected individuals.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Peripheral blood mononuclear cells (PBMC) from individuals with Human Immunodeficiency Virus (HIV) infection are prone to apoptosis in vitro.
- Apoptosis, or programmed cell death, is a critical factor in immune dysfunction during HIV pathogenesis.
Purpose of the Study:
- To quantify apoptosis in PBMC from HIV-infected individuals across different disease stages.
- To investigate the correlation between apoptosis, clinical staging, and CD4/CD8 ratio in HIV infection.
- To evaluate the effect of Interleukin-2 (IL-2) on PBMC apoptosis in HIV patients.
Main Methods:
- PBMC were isolated from healthy controls and HIV-infected subjects (asymptomatic and advanced disease).
- Apoptosis was measured using propidium iodide staining and flow cytometry.
- Statistical analysis was performed to correlate apoptosis with clinical stage (CDC classification) and CD4/CD8 T cell ratio.
Main Results:
- Apoptosis percentages in PBMC significantly increased with HIV disease progression (CDC II vs. CDC IV, P < 0.001).
- A significant negative correlation was observed between PBMC apoptosis and the CD4/CD8 T cell ratio (R = -0.57, P = 0.012).
- No significant difference in apoptosis was found related to AZT therapy, but IL-2 addition markedly reduced PBMC apoptosis in HIV-infected patients.
Conclusions:
- PBMC apoptosis is a key feature of HIV infection, directly linked to disease severity and immune cell imbalance.
- Interleukin-2 demonstrates a potent anti-apoptotic effect on PBMC in the context of HIV infection.
- These findings suggest IL-2 as a potential therapeutic agent to mitigate immune cell loss in HIV/AIDS.