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Ultrastructural and functional changes in pancreatic acinar cells during autolysis
Virchows Archiv. B, Cell Pathology
|August 10, 1977
Summary
Anoxic cell injury in rat pancreatic acinar cells causes membrane breakdown and loss of secretory function. Zymogen granules remain intact initially, with no signs of autophagy during this hypoxic autolysis.
Area of Science:
- Cell Biology
- Gastroenterology
- Pathology
Background:
- Pancreatic acinar cells are crucial for digestion.
- Understanding cell injury mechanisms is vital for treating pancreatic diseases.
Purpose of the Study:
- To investigate the effects of anoxemic (hypoxic) cell injury on rat pancreatic acinar cells in vitro.
- To characterize the morphological and functional changes during hypoxic autolysis.
Main Methods:
- Rat pancreatic acinar cell preparations were incubated at 18-20°C for varying durations (0-24 hours).
- Electron microscopy was used to assess cellular morphology.
- Amylase release was measured to evaluate secretory response to pancreozymin stimulation.
Main Results:
- Cellular disintegration initiated with compartment swelling and membrane breakdown.
- Zymogen granules remained intact for at least 3 hours; no increased autophagy was observed.
- Secretory response to pancreozymin diminished significantly within 12 hours.
- No active trypsin was detected in tissue samples during 24 hours of observation.
Conclusions:
- Acinar cell disintegration under hypoxic conditions results from membrane damage, not autophagy.
- Zymogen granules retain morphology despite early membrane damage.
- Pancreatic acinar cells maintain secretory responsiveness for 3-6 hours under these conditions.