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Electron microscopic study of the parathyroid gland of the acetazolamide-treated mouse
Abstract:
Ultrastructural aspects of the parathyroid glands of acetazolamide-treated mice were examined. Many chief cells of the treated mice are deficient in free ribosomes compared with the control mice. Most Golgi complexes are poorly developed and associated with a few prosecretory granules. However, relatively numerous secretory granules are observed in the cytoplasm, and a few secretory granules are present in the peripheral cytoplasm. Large secretory granules (storage granules), homogeneously dense bodies with a low electron density, heterogeneously dense bodies containing osmiophilic substance and/or lipid-like material, multivesicular bodies and lipid droplets have apparently increased in number in many chief cells of the experimental mice. Many transitional forms are recognized between each of the large secretory granules and the bodies mentioned above. These ultrastructural features suggest that parathyroid gland cellular activity is suppressed in response to acetazolamide treatment. In addition, correlations of the occurrence of large secretory granules and various bodies are discussed.
Insights
Acetazolamide treatment suppresses parathyroid gland cellular activity in mice. Ultrastructural changes in chief cells, including fewer ribosomes and altered secretory granules, indicate reduced function.
Area of Science:
- Endocrinology
- Cell Biology
- Histology
Background:
- Parathyroid glands regulate calcium and phosphate homeostasis.
- Acetazolamide is a carbonic anhydrase inhibitor with known systemic effects.
- Understanding its impact on parathyroid ultrastructure is crucial.
Purpose of the Study:
- To investigate the ultrastructural effects of acetazolamide on mouse parathyroid chief cells.
- To identify cellular changes indicative of altered parathyroid gland activity.
Main Methods:
- Transmission electron microscopy was used to examine parathyroid glands from acetazolamide-treated and control mice.
- Ultrastructural features of chief cells were quantitatively and qualitatively assessed.
Main Results:
- Acetazolamide-treated mice showed decreased free ribosomes in chief cells.
- Golgi complexes were poorly developed with fewer prosecretory granules.
- Increased numbers of large secretory granules, dense bodies, multivesicular bodies, and lipid droplets were observed.
- Transitional forms between granules and other bodies suggest altered secretory pathways.
Conclusions:
- Acetazolamide treatment leads to suppressed parathyroid gland cellular activity.
- Observed ultrastructural changes reflect a reduction in hormone synthesis and secretion.
- Further research is needed to fully elucidate the mechanisms and implications of these findings.