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Cultures of mast cell-like (MCL) cells from human pleural exudate cells
Abstract:
Under special culture conditions, rat peritoneal macrophages have previously been shown to transform into mast cells. This method has been adapted here to the human species. Adherent large mononuclear cells from human pleural exudates were cultured in a medium supplemented with horse serum (30%) and fibroblast supernatants (30%). Metachromatic staining (toluidine blue, pH 3.6) of cytoplasmic granules appeared first in a small percentage of cells by days 5-6 of culture and reached a high intensity in 50% of the cells between days 12-22. Histamine levels within the cells increased by a factor of 7 during this same time period and the cell size by a factor of 3. Cultures could be maintained for about three weeks, since viability and total cell number decreased on extended culture. The data suggest that mononuclear cells in inflammatory exudates can transform into mast cell-like cells under the influence of high levels of specific conditioning factors in their microenvironment.
Insights
Human mononuclear cells from pleural exudates can transform into mast cell-like cells in vitro. This transformation involves increased cytoplasmic granules, histamine levels, and cell size under specific culture conditions.
Area of Science:
- Cell Biology
- Immunology
Background:
- Macrophages can transform into mast cells under specific conditions.
- Previous studies demonstrated this transformation in rats.
Purpose of the Study:
- To adapt the rat macrophage-to-mast cell transformation method to human cells.
- To investigate the potential of human mononuclear cells to differentiate into mast cells.
Main Methods:
- Human mononuclear cells from pleural exudates were cultured in a specialized medium.
- The medium was supplemented with horse serum and fibroblast supernatants.
- Cellular changes were assessed using metachromatic staining, histamine level measurements, and cell size analysis.
Main Results:
- Metachromatic staining of cytoplasmic granules appeared by days 5-6 and intensified by days 12-22.
- Intracellular histamine levels increased sevenfold, and cell size tripled.
- Optimal culture duration was approximately three weeks, after which viability decreased.
Conclusions:
- Human mononuclear cells from inflammatory exudates can differentiate into mast cell-like cells.
- This transformation is influenced by specific conditioning factors in the microenvironment.
- The findings suggest a potential in vitro model for studying mast cell differentiation.