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In vitro generation of mast cell-like cells from human peripheral mononuclear phagocytes
Abstract:
An in vitro culture method, previously shown to induce the transformation of rat macrophages to mast cells, has been adapted to humans. Adherent peripheral human blood mononuclear cells were cultured in a medium supplemented with 30% L-cell supernatant and 30% horse serum. During the first week of culture, the cells were phagocytic (80%), lacked histamine, were not metachromatic and stained faintly for naphthol-AS-D-chloroacetate esterase, primarily in a paranuclear location. During the first 2 weeks of culture, the cells grew in size, synthesized DNA, became nonadherent and developed cytoplasmic chloroacetate esterase staining which was strongly positive in 50-60% of the cells during the third week. Intracellular histamine levels increased steadily during culture, and electron-dense metachromatic cytoplasmic granules were present during the third week. Human peripheral blood mononuclear cells contain therefore a subpopulation of cells that can differentiate into mast cells-like cells under specific in vitro culture conditions.
Insights
Human peripheral blood mononuclear cells can transform into mast cells in vitro. This study adapted a rat macrophage to mast cell culture method for human cells, observing key cellular changes over three weeks.
Area of Science:
- Immunology
- Cell Biology
- Hematology
Background:
- Macrophages and mast cells are critical immune cells.
- Previous research demonstrated in vitro macrophage-to-mast cell transformation in rats.
Purpose of the Study:
- To adapt a rat-based in vitro culture method for human cells.
- To investigate the differentiation potential of human peripheral blood mononuclear cells into mast cells.
Main Methods:
- Human peripheral blood mononuclear cells were cultured in vitro.
- The culture medium was supplemented with L-cell supernatant and horse serum.
- Cellular characteristics were analyzed over a three-week period.
Main Results:
- Cells exhibited phagocytosis initially, then increased in size and DNA synthesis.
- Development of cytoplasmic chloroacetate esterase positivity and histamine content was observed.
- Metachromatic cytoplasmic granules, characteristic of mast cells, appeared by the third week.
Conclusions:
- Human peripheral blood mononuclear cells contain a subpopulation capable of differentiating into mast cells.
- The adapted in vitro culture method successfully induced mast cell-like differentiation.
- This method provides a valuable tool for studying human mast cell development.