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Biphasic calcitonin release in the newborn rat
Biomedicine / [Publiee Pour L'A.A.I.C.I.G.]
|July 1, 1980
Summary
Administering calcium to newborn rats rapidly elevated plasma calcium levels and triggered a calcitonin response. This study investigates the hormonal regulation of calcium in neonates.
Area of Science:
- Endocrinology
- Neonatal Physiology
- Mineral Metabolism
Background:
- Neonatal calcium homeostasis is critical for development.
- The role of calcitonin in rapid calcium regulation in newborns is not fully understood.
Purpose of the Study:
- To investigate the immediate effects of calcium gavage on plasma calcium and calcitonin levels in newborn rats.
- To explore the relationship between calcium administration, calcitonin secretion, and plasma phosphate levels in neonates.
Main Methods:
- Oral gavage of calcium (200 mg Ca/kg body weight) or saline in 2-h-old fasted newborn rats.
- Measurement of plasma calcium and calcitonin concentrations at various time points (2, 5, 30, 60, 90 minutes) post-gavage.
- Analysis of plasma phosphate levels.
Main Results:
- Calcium gavage rapidly increased plasma calcium levels within 2 minutes, peaking at 30 minutes.
- A significant peak in plasma calcitonin was observed 5 minutes after calcium gavage.
- Plasma phosphate levels decreased from 30 to 90 minutes post-calcium gavage.
Conclusions:
- Acute calcium administration in newborn rats effectively elevates plasma calcium and stimulates calcitonin release.
- The observed changes in plasma phosphate may be linked to calcitonin secretion in response to hypercalcemia.
- These findings highlight the rapid hormonal responses governing calcium metabolism in the neonatal period.