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Vitamin D and vitamin D dependency

Y Tsuchiya, N Matsuo, H Cho

    Contributions to Nephrology
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    Large vitamin D2 doses increase 25-hydroxyvitamin D in rickets patients. While 1,25-dihydroxyvitamin D rises in hypophosphatemic rickets, vitamin D dependency shows a smaller increase, suggesting impaired 1 alpha-hydroxylation.

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    Area of Science:

    • Endocrinology
    • Metabolic Bone Disease

    Background:

    • Vitamin D dependency and hypophosphatemic vitamin D-resistant rickets are conditions characterized by impaired vitamin D metabolism.
    • Understanding the specific metabolic defects is crucial for effective treatment strategies.

    Observation:

    • Administration of high-dose vitamin D2 significantly elevated 25-hydroxyvitamin D levels in both patient groups.
    • A notable increase in 1,25-dihydroxyvitamin D was observed in hypophosphatemic vitamin D-resistant rickets, but a lesser increase in vitamin D dependency.
    • Despite the smaller increase, 1,25-dihydroxyvitamin D levels in vitamin D dependency approached normal adult values with vitamin D2 treatment.

    Findings:

    • Patients with vitamin D dependency exhibit a marked defect in renal 1 alpha-hydroxylation.
    • High-dose vitamin D2 can overcome this defect to some extent, increasing serum 1,25-dihydroxyvitamin D and improving rickets.
    • 1 alpha-hydroxyvitamin D3 proved significantly more potent than vitamin D2 in treating vitamin D dependency.

    Implications:

    • This study highlights the critical role of renal 1 alpha-hydroxylation in vitamin D metabolism and rickets pathogenesis.
    • It suggests that while high-dose vitamin D2 can be beneficial, alternative therapies like 1 alpha-hydroxyvitamin D3 may be more effective for vitamin D dependency.
    • Findings provide insights into personalized treatment approaches for different forms of vitamin D-resistant rickets.