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Parathyroid hormone and calcitonin in glucose regulation
Insights
Glucose challenges in children cause significant changes in calcium, phosphorus, parathyroid hormone (PTH), and calcitonin (CT) levels. These hormonal shifts highlight the body's complex metabolic regulation during glucose metabolism.
Area of Science:
- Pediatric Endocrinology
- Metabolic Regulation
- Calcium Homeostasis
Background:
- Glucose metabolism significantly impacts mineral and hormonal balance.
- Understanding these interactions is crucial for pediatric metabolic health.
- Previous research has not fully elucidated the acute effects of various glucose administration methods on calcium-regulating hormones in young children.
Purpose of the Study:
- To investigate the effects of oral glucose load, intravenous glucose infusion, and glucagon administration on blood glucose, insulin, calcium (Ca), phosphorus (P), parathyroid hormone (PTH), and calcitonin (CT) levels in normal children.
- To analyze the dynamic hormonal responses to different glucose challenges in early childhood.
Main Methods:
- Evaluated 8 normal children (17-41 months) during oral glucose tolerance tests.
- Assessed 7 normal children (15-42 months) during intravenous glucose infusion.
- Monitored 6 normal children (19-40 months) during glucagon administration, measuring key blood parameters.
Main Results:
- Oral glucose load and i.v. glucose infusion led to significant declines in serum Ca and P, with maximum decreases observed at 120 min and 30 min, respectively.
- Both glucose administration methods and glucagon injection caused significant increases in PTH and CT levels from basal values.
- Specific hormonal peaks and declines were documented at various time points post-administration.
Conclusions:
- Increases in glucose and insulin, induced by oral or i.v. glucose, or glucagon injection, are associated with concurrent decreases in serum Ca and P.
- These metabolic challenges also trigger significant increases in PTH and CT, indicating a coordinated hormonal response.
- The study demonstrates a complex interplay between glucose metabolism and calcium-regulating hormones in young children.
Abstract:
Blood glucose, insulin, calcium (Ca), phosphorus (P), parathyroid hormone (PTH) and calcitonin (CT) were evaluated in 8 normal children, aged 17-41 months, during an oral glucose load; in 7 normal children, aged 15-42 months, during i.v. glucose infusion; and in 6 normal children, aged 19-40 months, during glucagon administration. During the oral glucose tolerance tests the mean maximum decline of Ca (8.63%) and p (12.66%) was at 120 min, while PTH and CT significantly increased from basal values of 1.36 ng/ml +/- 0.21 and 97 pg/ml +/- 14 to 2.20 ng/ml +/- 0.22 and 140 pg/ml +/- 13, respectively, at 45 min. During i.v. glucagon administration the mean maximum decline of Ca (9.64%) and P (12.28%) was at 30 min. PTH levels rose significantly from basal values of 1.2 mg/ml +/- 0.22 to 2.1 ng/ml +/- 0.32 at 45 min, while CT increased rapidly from basal levels of 90 pg/ml +/- 14 to 127 pg/ml at 15 min. In conclusion, increases in glucose and insulin due to ingestion or infusion of glucose, or to glucagon injection, are therefore not only associated with a fall in serum Ca and P but also with rises in PTH and CT.