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Viability of cultured peripheral blood mononuclear cells from atopic individuals
Abstract:
The viability of cultured peripheral blood mononuclear cells (MNC) from atopic children was found to be subnormal. After 3 days of culture, less than 5% of cells from nonatopic children had died as judged by trypan blue exclusion tests, whereas more than 4 times as many dead cells were observed in cultures of cells from atopics with high IgE levels (greater than 400 units/ml). MNC from atopics with low or moderately increased IgE levels did not display any significantly decreased viability. Low cell viability was observed primarily in cultures from patients with atopic dermatitis, but also in cases with respiratory allergy with high IgE levels but without concomitant atopic dermatitis, there was a decreased viability. There was no evidence that low cell viability was causally related to occurrence of cytotoxic serum factors. Results of experiments where dibutyryl cyclic AMP or theophylline was included in the cultures suggested that a possible explanation for the decreased viability might be altered sensitivity of the cells to inactivation by cyclic AMP promoting substances.
Insights
Peripheral blood mononuclear cells (MNC) from children with atopic conditions show reduced viability in culture. This decreased cell survival, particularly in those with high IgE levels, may be linked to altered cyclic AMP sensitivity.
Area of Science:
- Immunology
- Cell Biology
Background:
- Atopic diseases, such as atopic dermatitis and respiratory allergies, are characterized by immune dysregulation.
- Peripheral blood mononuclear cells (MNC) are crucial immune cells involved in allergic responses.
Purpose of the Study:
- To investigate the viability of cultured MNC from children with atopic conditions.
- To explore potential factors contributing to decreased MNC viability in atopic individuals.
Main Methods:
- Culturing peripheral blood mononuclear cells (MNC) from atopic and non-atopic children.
- Assessing cell viability using trypan blue exclusion tests after 3 days of culture.
- Analyzing the effect of cyclic AMP modulating substances (dibutyryl cyclic AMP, theophylline) on cell viability.
Main Results:
- MNC from atopic children, especially those with high IgE levels (>400 units/ml), exhibited significantly lower viability compared to non-atopic children.
- Decreased viability was most prominent in patients with atopic dermatitis but also observed in those with respiratory allergies and high IgE.
- Low viability was not attributed to cytotoxic serum factors.
- Inclusion of dibutyryl cyclic AMP or theophylline suggested altered sensitivity to cyclic AMP promoting substances as a potential cause.
Conclusions:
- Cultured MNC from atopic children demonstrate reduced viability, particularly in cases with elevated IgE levels.
- The findings suggest a potential role for altered cyclic AMP signaling pathways in the decreased MNC viability observed in atopic individuals.