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C cells in the thyroid of pinealectomized rats
Marcus Aurelho de Lima1, Lilian Margareth Biagioni de Lima, Leandro Luís Lopes Freitas
1Faculty of Medicine of the Triângulo Mineiro, University of Uberaba, Brazil.
Revista Do Hospital Das Clinicas
|May 20, 2003
Summary
Pinealectomy significantly increases the number of thyroid C cells in rats. This study quantifies C cell changes after pineal gland removal, impacting calcitonin regulation.
Area of Science:
- Endocrinology
- Histology
Background:
- C cells in the thyroid are responsible for calcitonin synthesis and secretion.
- The pineal gland's role in regulating endocrine functions is not fully understood.
Purpose of the Study:
- To quantitatively assess the impact of pinealectomy on C cell numbers in rat thyroids.
- To investigate the potential influence of pinealectomy on calcitonin synthesis and secretion.
Main Methods:
- Pinealectomy was performed on male rats (n=10); a control group (n=10) was maintained.
- Thyroid tissues were stained for calcitonin.
- C cell counts were quantified as cells/cm² and analyzed using the Mann-Whitney test.
Main Results:
- Pinealectomized rats exhibited a statistically significant increase (P <0.05) in thyroid C cell numbers compared to controls.
- C cell counts ranged from 489-2084/cm² in pinealectomized rats versus 227-1584/cm² in controls.
Conclusions:
- Pinealectomy leads to a significant increase in the number of thyroid C cells in rats.
- These findings suggest a regulatory role of the pineal gland in C cell populations and potentially calcitonin secretion.