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Updated: Sep 8, 2026
Isolation of Peritoneum-derived Mast Cells and Their Functional Characterization with Ca2+-imaging and Degranulation Assays
Published on: July 4, 2018
Mast cell degranulation and histamine release observed in a new in vitro system
Abstract:
A method is described by which mast cells harvested from the rat peritoneal cavity can be deposited on the surface of a Millipore filter without gross injury, permitting observation of morphological and chemical changes induced by a variety of agents. These isolated peritoneal mast cells respond to 48/80 and to polymyxin B but not to dextran or ovomucoid with degranulation and histamine release. Thus four agents which in vivo appear to have similar activities have been found by means of in vitro analysis to operate by at least two different mechanisms.
Insights
Isolated rat mast cells were studied in vitro. Researchers found that while some agents cause degranulation and histamine release, others do not, revealing distinct mechanisms of action.
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- Mast cells play a crucial role in allergic reactions and inflammation.
- Understanding mast cell activation mechanisms is vital for developing targeted therapies.
Purpose of the Study:
- To develop a method for isolating and observing rat peritoneal mast cells in vitro.
- To investigate the distinct mechanisms of mast cell activation by different agents.
Main Methods:
- Harvesting mast cells from rat peritoneal cavity.
- Depositing mast cells onto Millipore filters for observation.
- Treating isolated mast cells with agents like 48/80, polymyxin B, dextran, and ovomucoid.
- Monitoring for degranulation and histamine release.
Main Results:
- A method was established to culture intact rat mast cells on filters.
- Mast cells degranulated and released histamine in response to 48/80 and polymyxin B.
- Dextran and ovomucoid did not induce degranulation or histamine release in vitro.
- In vitro findings suggest at least two distinct mechanisms of mast cell activation.
Conclusions:
- The developed in vitro method allows for the study of mast cell responses to various stimuli.
- The study differentiates the mechanisms of action for agents that appear similar in vivo.
- This research provides insights into the heterogeneity of mast cell activation pathways.
