Bone modulating factors in nephrotic children with normal glomerular filtration rate

Area of Science:

• Pediatric Nephrology
• Endocrinology
• Mineral Metabolism

Background:

• Nephrotic syndrome in children often presents with dyslipidemia and hypoalbuminemia.
• Bone and mineral metabolism disturbances are common but less studied in nephrotic children with preserved kidney function.

Purpose of the Study:

• To investigate factors influencing bone and mineral metabolism in children with active nephrotic syndrome and normal glomerular filtration rate.
• To assess vitamin D status, calcium, and parathyroid hormone levels in this specific patient group.

Main Methods:

• Evaluated 16 children with active nephrotic syndrome and normal glomerular filtration rate.
• Measured serum calcium, magnesium, triglyceride, cholesterol, parathyroid hormone, 25-hydroxyvitamin D, and 1,25-dihydroxyvitamin D.
• Assessed bone mineral content using photon absorptiometry.

Main Results:

• All patients had hypocalcemia and low plasma 25-hydroxyvitamin D levels.
• Bone mineral content was reduced in a significant proportion of patients.
• Abnormalities were observed irrespective of glucocorticoid therapy status.

Conclusions:

• Children with nephrotic syndrome and normal kidney function experience significant bone and mineral metabolism abnormalities.
• Deficiencies in 25-hydroxyvitamin D and potentially 1,25-dihydroxyvitamin D contribute to hypocalcemia and bone undermineralization.
• These findings highlight the need for further investigation into therapeutic interventions like vitamin D metabolite and calcium supplementation.