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Paracrystalloids from mitochondria in thyroid follicular cells. Normal occurrence and experimental induction
Summary
Thyroid gland cells in bats exhibit unique paracrystalloid bodies derived from mitochondria during euthyroid restoration. This finding, replicated in rats, suggests rapid follicular cell activity shutdown promotes paracrystalloid formation.
Area of Science:
- Endocrinology
- Cell Biology
- Comparative Anatomy
Background:
- Thyroid gland activity fluctuates throughout the annual life cycle.
- Restoration of the euthyroid state follows periods of high thyroid activity.
Purpose of the Study:
- To investigate the ultrastructure of bat thyroid follicular cells during euthyroid restoration.
- To identify novel ultrastructural features associated with thyroid gland activity cycles.
Main Methods:
- Ultrastructural analysis of bat thyroid follicular cells.
- Induction of similar thyroid conditions in rat models.
- Comparative analysis of mitochondrial morphology.
Main Results:
- Bats in early June showed prominent, large paracrystalloid bodies in thyroid follicular cells.
- These paracrystalloids were derived from mitochondria, with cristae reorganizing into parallel membranes.
- Rats treated with thiouracil followed by L-triiodothyronine exhibited similar mitochondrial-paracrystalline alterations.
Conclusions:
- Rapid shutdown of active thyroid follicular cells may promote paracrystalloid formation from mitochondria.
- Mitochondrial alterations are linked to specific thyroid activity states.
- This study reveals a novel ultrastructural response in thyroid cells.