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Colloid resorption in thyroid glands as revealed by scanning electron microscopy
Endokrinologie
|November 1, 1978
Summary
Calcitonin treatment significantly enhances colloid resorption in thyroid follicles, increasing cell surface activity and pseudopod formation for endocytosis. Scanning electron microscopy reveals detailed follicular cell surface roles in thyroid physiology.
Area of Science:
- Endocrinology
- Cell Biology
- Histology
Background:
- Thyroid follicles are key structures for thyroid hormone synthesis and storage.
- Colloid resorption is a crucial process in thyroid hormone regulation.
- Understanding the cellular mechanisms of colloid resorption is vital for thyroid physiology.
Purpose of the Study:
- To investigate the effects of calcitonin on colloid resorption from thyroid follicles.
- To compare the cell surface morphology of thyroid follicular cells in control and calcitonin-treated rabbits.
- To elucidate the role of the follicular cell surface in thyroid physiology using scanning electron microscopy.
Main Methods:
- Scanning electron microscopy was used to examine thyroid follicles.
- Comparative ultrastructural analysis was performed on control and calcitonin-treated rabbit thyroid glands.
- Cell surface activity, including vesicle and pseudopod formation, was observed.
Main Results:
- Calcitonin treatment induced intense cell surface activity on thyroid follicular cells.
- Predominant features included exocytotic vesicles and large pseudopods involved in colloid droplet engulfment (endocytosis).
- Control thyroid follicles showed only microvilli on the cell surface.
Conclusions:
- Calcitonin significantly stimulates colloid resorption via enhanced endocytosis mediated by pseudopods.
- Scanning electron microscopy provides detailed visualization of follicular cell surface dynamics in thyroid physiology.
- The study highlights the dynamic role of the follicular cell surface in regulating colloid resorption.