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[Sex hormones and calcitonin secretion]
La Semaine Des Hopitaux : Organe Fonde Par L'Association D'Enseignement Medical Des Hopitaux De Paris
|April 26, 1975
Summary
Estrogen significantly increases calcitonin secretion in castrated rats, crucial for bone calcium maintenance during pregnancy and menopause. This hormonal effect is dependent on the thyroid gland.
Area of Science:
- Endocrinology
- Reproductive Biology
- Bone Metabolism
Background:
- Elevated serum calcitonin during pregnancy suggests a role for sex hormones.
- Understanding estrogen's influence on calcitonin is vital for bone health, particularly in women.
Purpose of the Study:
- To investigate the role of estrogens in calcitonin secretion.
- To determine the impact of estrogen and progesterone on calcitonin activity.
- To explore the synergistic effects of estrogens and calcitonin on bone calcium.
Main Methods:
- Utilized castrated rats to assess estrogen's effect on calcitonin activity.
- Employed a biological assay to measure plasma calcitonin levels.
- Investigated the influence of thyroidectomy on estrogen-induced calcitonin changes.
Main Results:
- Injected estrogen increased calcitonin activity in castrated rats.
- This estrogenic effect was abolished by concurrent thyroidectomy.
- Progesterone showed a less pronounced effect on calcitonin levels.
Conclusions:
- Estrogens play a significant role in stimulating calcitonin secretion.
- Thyroid gland is essential for estrogen's effect on calcitonin.
- Estrogens synergize with calcitonin to maintain bone calcium, important for pregnancy and post-menopause.