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Activation of alveolar macrophages from children with the acquired immunodeficiency syndrome-related complex
A Clement1, A Sardet, K Chadelat
1Department of Pulmonary Pediatrics, Hôpital Trousseau, Paris, France.
Insights
Children with acquired immunodeficiency syndrome (AIDS)-related complex show increased hydrogen peroxide (H2O2) release from alveolar macrophages (AM). This finding may indicate early lung disease activity in pediatric AIDS patients.
Area of Science:
- Immunology
- Pulmonology
- Pediatrics
Background:
- Alveolar macrophages (AM) play a crucial role in lung immunity.
- Assessing AM function can provide insights into pulmonary disease progression.
- Children with acquired immunodeficiency syndrome (AIDS)-related complex may exhibit subtle lung involvement.
Purpose of the Study:
- To investigate the hydrogen peroxide (H2O2) release capacity of AM in children with AIDS-related complex.
- To compare H2O2 release in children with and without lung parenchymal disorders.
- To explore AM activation as a potential marker for lung disease evolution in pediatric AIDS.
Main Methods:
- Collected bronchoalveolar lavage (BAL) fluid from children with AIDS-related complex and healthy controls.
- Isolated and cultured alveolar macrophages (AM).
- Measured H2O2 release from unstimulated and phorbol myristate acetate (PMA)-stimulated AM.
Main Results:
- AM from children with AIDS-related complex demonstrated significantly increased H2O2 accumulation in the medium.
- This enhanced H2O2 release was observed under both unstimulated and stimulated conditions (P < 0.001).
- Cytologic analysis of BAL fluid showed increased cellularity and lymphocyte percentage in the AIDS-related complex group.
Conclusions:
- Children with AIDS-related complex exhibit heightened oxidative activity in their AM.
- Increased AM H2O2 release may signify an early, transient stage of LAV/HTLV-III pulmonary disease.
- Monitoring AM activation could serve as a reliable indicator of lung disorder progression in pediatric AIDS.
Abstract:
The ability of alveolar macrophages (AM) to release hydrogen peroxide (H2O2), an indicator of AM function, was studied in five children with the acquired immunodeficiency syndrome (AIDS) related complex and, for comparison, in 11 children without disorders of the lung parenchyma. In the AIDS-related complex group, pulmonary manifestations were mild, and lung involvement was suspected by moderate clinical and/or radiological features. None had a past history of opportunistic infections; neither did any have lymphopenia. Cytologic study of the bronchoalveolar lavage (BAL) fluid revealed increased cellularity with increased percentage of lymphocytes. The study of H2O2 release was performed on unstimulated AM and on AM stimulated by phorbol myristate acetate (PMA). Under both experimental conditions, the amount of H2O2 accumulated in the medium was significantly increased in the group with AIDS-related complex (P less than 0.001). As no enhanced oxidative activity has been reported in AM from patients with full-blown AIDS, an increased ability of AM to release oxygen metabolites from children with AIDS-related complex may reflect an initial and temporary step in the course of the LAV/HTLV-III pulmonary disease. Determining AM activation might be a reliable method of assessing the evolution of lung disorder in AIDS.