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Ca2+-induced excess capacitance fluctuation studied by phase-sensitive detection method in exocrine pancreatic acinar
Pflugers Archiv : European Journal of Physiology
|November 1, 1986
Summary
This study used a novel detection method to observe calcium-induced changes in pancreatic acinar cells. Findings suggest individual granular fusion and retrieval events drive these capacitance changes, offering insights into exocytosis and endocytosis.
Area of Science:
- Cell biology
- Biophysics
- Physiology
Background:
- Exocrine pancreatic acinar cells are crucial for digestion and hormone production.
- Understanding exocytosis and endocytosis mechanisms is vital for cellular function.
- Previous methods lacked the resolution to observe individual fusion events.
Purpose of the Study:
- To investigate the role of calcium in exocrine pancreatic acinar cell secretion.
- To characterize the mechanisms of granular fusion and retrieval.
- To develop a method for studying exocytosis and endocytosis in polarized cells.
Main Methods:
- Utilized a phase-sensitive detection method combined with whole-cell voltage-clamp.
- Applied the technique to exocrine pancreatic acinar cells isolated from rats.
- Analyzed cell capacitance changes induced by specific calcium concentrations.
Main Results:
- Observed stepwise changes in cell capacitance upon exposure to 5 x 10(-7) M Ca2+.
- The size distribution of capacitance steps aligns with individual granular fusion and retrieval events.
- Demonstrated the method's capability to resolve discrete exocytotic and endocytotic events.
Conclusions:
- The phase-sensitive detection method allows for the study of individual exocytosis and endocytosis events.
- Calcium influx triggers discrete fusion and retrieval of secretory granules in pancreatic acinar cells.
- This technique offers a powerful tool for investigating membrane trafficking in polarized secretory cells.