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Urinary excretion of adenosine 3'5' monophosphate in vitamin D deficiency
Insights
Children with rickets show increased urinary cyclic adenosine 3'5' monophosphate (AMP) excretion, correlating with parathyroid hormone levels. This suggests vitamin D deficiency impacts cyclic AMP levels via secondary hyperparathyroidism.
Area of Science:
- Pediatric Endocrinology
- Mineral Metabolism
- Biochemistry
Background:
- Rickets is a condition characterized by impaired bone mineralization, often linked to vitamin D deficiency.
- Secondary hyperparathyroidism is a common complication in vitamin D deficiency states.
- Cyclic adenosine 3'5' monophosphate (AMP) is a key intracellular second messenger involved in various hormonal pathways.
Purpose of the Study:
- To investigate urinary cyclic adenosine 3'5' monophosphate (AMP) excretion in children with rickets.
- To explore the relationship between cyclic AMP levels and key biochemical markers in rickets.
- To elucidate the role of parathyroid hormone (PTH) in regulating cyclic AMP excretion during vitamin D deficiency.
Main Methods:
- Radioimmunoassay was used to quantify urinary cyclic AMP levels.
- Measurements were performed in children diagnosed with rickets and in age-matched healthy controls.
- Correlation analyses were conducted between cyclic AMP, parathyroid hormone (PTH), alkaline phosphatase, calcium, and inorganic phosphate levels.
Main Results:
- Urinary cyclic AMP excretion was significantly elevated in children with rickets compared to controls.
- Cyclic AMP levels showed a significant positive correlation with parathyroid hormone (PTH) and alkaline phosphatase.
- Calcium infusion resulted in a decrease in urinary cyclic AMP excretion.
Conclusions:
- Elevated urinary cyclic AMP in rickets is associated with secondary hyperparathyroidism.
- Vitamin D deficiency may lead to increased renal cyclic AMP excretion due to high PTH levels.
- The precise mechanisms driving secondary hyperparathyroidism in vitamin D deficiency warrant further investigation.
Abstract:
Urinary cyclic adenosine 3'5' monophosphate (AMP) excretion has been determined by radioimmunoassay in children with rickets and in control children. Cyclic AMP was greatly increased in children with rickets. The excretion of cyclic AMP correlated significantly with parathyroid hormone levels (PTH) and alkaline phosphatase, but not with age, calcaemia and serum inorganic phosphate. Calcium infusion led to a decrease in the excretion of cyclic AMP. The data are consistent with following hypothesis. During vitamin D deficiency, high PTH levels can increase the renal excretion of cyclic AMP. The effects of PTH on bone resorption fail to maintain the levels of serum calcium due to the lack of vitamin D. The mechanism by which the secondary hyperparathyroidism develops during vitamin D deficiency remains to be investigated.