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Lymphocyte stimulation with phorbol myristate acetate in atopic and non-atopic individuals
Abstract:
Phorbol myristate acetate (PMA) was found to be a potent stimulator of DNA synthesis in human whole blood cell cultures. Stimulation with pokeweed mitogen was strongly enhanced by addition of PMA-activated cells. PMA responsiveness varied with age, being low or absent in newborns and very pronounced in adults. In atopic children, PMA responsiveness was normal or increased. The ratio of phytohemagglutinin to PMA responsiveness was significantly reduced in cultures from such children. This finding would be compatible with the hypothesis of a relative suppressor cell deficiency in atopic disease. The results of tests designed to detect suppressor and helper cell activity, added further support to this hypothesis.
Insights
Phorbol myristate acetate (PMA) stimulates DNA synthesis in human cells. Atopic children showed normal or increased PMA responsiveness, suggesting a potential suppressor cell deficiency in atopic disease.
Area of Science:
- Immunology
- Cell Biology
Background:
- Phorbol myristate acetate (PMA) is a known stimulator of cellular processes.
- Understanding immune cell responses is crucial for diagnosing and treating immune-related disorders.
Purpose of the Study:
- To investigate the effect of PMA on DNA synthesis in human whole blood cell cultures.
- To explore PMA responsiveness in relation to age and atopic conditions.
- To evaluate the potential role of suppressor cells in atopic disease.
Main Methods:
- Human whole blood cell cultures were stimulated with PMA.
- Pokeweed mitogen stimulation was assessed with and without PMA-activated cells.
- Phytohemagglutinin (PHA) to PMA responsiveness ratios were analyzed.
- Suppressor and helper cell activity assays were performed.
Main Results:
- PMA potently stimulated DNA synthesis in human whole blood cells.
- PMA responsiveness varied significantly with age, being low in newborns and high in adults.
- Atopic children exhibited normal or increased PMA responsiveness.
- A reduced PHA to PMA responsiveness ratio was observed in atopic children.
- Further assays supported a hypothesis of relative suppressor cell deficiency in atopic disease.
Conclusions:
- PMA is a potent mitogen for human whole blood cells.
- Age significantly influences PMA responsiveness.
- Findings suggest a potential relative suppressor cell deficiency in atopic children, warranting further investigation.
- Immune cell function modulation by PMA offers insights into immune dysregulation in atopic conditions.