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Evidence that tissue mast cells derive from mononuclear phagocytes
International Archives of Allergy and Applied Immunology
|January 1, 1982
Summary
Researchers identified rat mast cell precursors as mononuclear phagocytes. These precursors, found in spleen and bone marrow, can differentiate into mast cells without feeder layers, unlike peritoneal macrophages.
Area of Science:
- Immunology
- Cell Biology
- Hematology
Background:
- Mast cells play crucial roles in allergic responses and immunity.
- Previous studies suggested mast cell precursors exist but their nature and origin remained unclear.
- A novel in vitro method allows mast cell differentiation without feeder layers.
Purpose of the Study:
- To characterize the nature, activation state, and organ distribution of rat mast cell precursors.
- To determine which rat tissues contain functional mast cell precursors.
- To investigate the potential of different immune cells to differentiate into mast cells.
Main Methods:
- In vitro culture of rat cells from various organs (spleen, bone marrow, lymph nodes, thymus).
- Morphological and enzyme-cytochemical analysis of precursor cells.
- Assessment of mast cell differentiation capacity in different cell populations.
Main Results:
- Mast cell precursors were identified as mononuclear phagocytes based on morphology and cytochemistry.
- Spleen and bone marrow contain mast cell precursors capable of differentiation.
- Peritoneal macrophages and cells from lymph nodes or thymus did not yield mast cells in culture.
Conclusions:
- Rat mast cell precursors are mononuclear phagocytes originating from spleen and bone marrow.
- The novel in vitro culture system effectively differentiates mast cells from these precursors.
- This research clarifies the cellular origin of mast cells and their distribution in rats.