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Scanning electron microscopy of mast cell degranulation
Summary
Compound 48/80 triggers significant morphologic changes in mast cells, revealing channels for granule extrusion and histamine release. This study visualizes mast cell degranulation mechanisms.
Area of Science:
- Cell Biology
- Immunology
- Microscopy
Background:
- Mast cells are crucial immune cells involved in allergic reactions.
- Compound 48/80 is a known agent that induces mast cell degranulation.
Purpose of the Study:
- To investigate the ultrastructural changes in isolated mast cells upon stimulation with compound 48/80.
- To correlate scanning electron microscopy (SEM) findings with transmission electron microscopy (TEM) data.
Main Methods:
- Isolated mast cells were studied using both SEM and TEM.
- Two SEM preparation techniques were employed: air-drying from alcohol and critical-point drying.
- Cells were stimulated with compound 48/80 before fixation and imaging.
Main Results:
- Resting mast cells exhibited distinct surface morphologies depending on preparation method.
- Compound 48/80 stimulation led to loss of surface ridges and granule extrusion.
- SEM and TEM revealed openings to intracellular channels containing granules, allowing cation access.
Conclusions:
- Compound 48/80 induces significant surface remodeling in mast cells.
- The observed openings facilitate extracellular cation exchange with intracellular granules, likely involving histamine.
- This study provides detailed ultrastructural insights into mast cell degranulation pathways.