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Adrenal chromaffin cells in the stressed mouse
Advances in Biochemical Psychopharmacology
|January 1, 1980
Summary
Restraint and water-immersion stress in mice significantly reduces secretory granules in chromaffin cells. This stress triggers exocytotic degranulation, indicating a cellular response to environmental challenges.
Area of Science:
- Neuroscience
- Cell Biology
- Stress Physiology
Background:
- Chromaffin cells are crucial for stress response, releasing catecholamines.
- Understanding the cellular mechanisms of stress is vital for physiological research.
Purpose of the Study:
- To investigate the ultrastructural changes in chromaffin cells following restraint and water-immersion stress.
- To elucidate the process of degranulation in chromaffin cells under acute stress conditions.
Main Methods:
- Mice were subjected to restraint and vertical water immersion stress.
- Chromaffin cell morphology was analyzed using light microscopy (silver impregnation, toluidine blue staining) and electron microscopy (thin section, freeze-fracture replica).
Main Results:
- A significant decrease in chromaffin cell secretory granules was observed 4-28 hours post-stress.
- Electron microscopy revealed exocytotic invaginations and pleomorphic granule material.
- Stress-induced degranulation was associated with the appearance of small cytoplasmic vesicles.
Conclusions:
- Restraint and water-immersion stress induce significant exocytotic degranulation of chromaffin cells.
- The observed cellular changes highlight the dynamic response of chromaffin cells to acute stressors.
- This study provides insights into the cellular mechanisms underlying stress adaptation.