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Morphological and functional changes during thyroid hyperplasia and involution in C3H Mice: evidence for
Endocrinology
|April 1, 1983
Summary
Thyroid hyperplasia involution in mice involves new follicle formation and cell multiplication, leading to increased thyroid cell numbers and weight. This study details the process of thyroid involution after goitrogenic treatment withdrawal.
Area of Science:
- Endocrinology
- Cell Biology
- Histology
Background:
- Thyroid hyperplasia, often induced by goitrogenic agents, requires understanding its reversal mechanisms.
- Discontinuing goitrogenic treatment initiates thyroid involution, a complex biological process.
Purpose of the Study:
- To investigate the morphological and cellular changes during thyroid hyperplasia involution.
- To elucidate the mechanisms of folliculogenesis and cell dynamics during thyroid involution.
Main Methods:
- Utilized morphological, histochemical, autoradiographic, and stereological techniques in C3H mice.
- Studied thyroid involution following the withdrawal of a low iodine diet supplemented with propylthiouracil.
Main Results:
- Involution onset featured colloid accumulation, cell necrosis, and intraepithelial microcavities mimicking follicular lumina.
- Microcavities originated from intercellular spaces, developing into new lumina and subsequently fusing to form new follicles (folliculogenesis).
- Folliculogenesis doubled the follicle count, primarily small follicles, accompanied by cell multiplication that compensated for necrosis.
Conclusions:
- Thyroid involution involves de novo folliculogenesis and significant cell proliferation.
- These processes contribute to the persistence of elevated thyroid weight post-hyperplasia.