Target values for 25-hydroxy and 1,25-dihydroxy vitamin D based on their associations with inflammation and calcium-phosphate metabolism

Target values for 25-hydroxy vitamin D and 1,25(OH)2D or 1,25-dihydroxy vitamin D remain a topic of debate among clinicians. We analysed data collected from December 2012 to April 2020 from two cohorts. Cohort A, comprising 455,062 subjects, was used to investigate the relationship between inflammat...

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Main Authors: Li, Xitong (Author) , Liu, Yvonne (Author) , Chen, Xin (Author) , Reichetzeder, Christoph (Author) , Elitok, Saban (Author) , Krämer, Bernhard (Author) , Hocher, Berthold (Author)
Format: Article (Journal)
Language:English
Published: 13 August 2024
In: Nutrients
Year: 2024, Volume: 16, Issue: 16, Pages: 1-16
ISSN:2072-6643
DOI:10.3390/nu16162679
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.3390/nu16162679
Verlag, kostenfrei, Volltext: https://www.mdpi.com/2072-6643/16/16/2679
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Author Notes:Xitong Li, Yvonne Liu, Xin Chen, Christoph Reichetzeder, Saban Elitok, Bernhard K. Krämer and Berthold Hocher

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520 |a Target values for 25-hydroxy vitamin D and 1,25(OH)2D or 1,25-dihydroxy vitamin D remain a topic of debate among clinicians. We analysed data collected from December 2012 to April 2020 from two cohorts. Cohort A, comprising 455,062 subjects, was used to investigate the relationship between inflammatory indicators (white blood cell [WBC] count and C-reactive protein [CRP]) and 25(OH)D/1,25(OH)2D. Cohort B, including 47,778 subjects, was used to investigate the connection between 25(OH)D/1,25(OH)2D and mineral metabolism markers (phosphate, calcium, and intact parathyroid hormone [iPTH]). Quadratic models fit best for all tested correlations, revealing U-shaped relationships between inflammatory indicators and 25(OH)D and 1,25(OH)2D. Minimal CRP and WBC counts were observed at 1,25(OH)2D levels of 60 pg/mL and at 25(OH)D levels of 32 ng/mL, as well as of 42 ng/mL, respectively. iPTH correlated inversely with both 1,25(OH)2D and 25(OH)D, while phosphate as well as calcium levels positively correlated with both vitamin D forms. Calcium-phosphate product increased sharply when 25(OH)D was more than 50 ng/mL, indicating a possible risk for vascular calcification. Multiple regression analyses confirmed that these correlations were independent of confounders. This study suggests target values for 25(OH)D between 30-50 ng/mL and for 1,25(OH)2D between 50-70 pg/mL, based particularly on their associations with inflammation but also with mineral metabolism markers. These findings contribute to the ongoing discussion around ideal levels of vitamin D but require support from independent studies with data on clinical endpoints. 
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