scholarly journals A Novel Method for the Determination of Vitamin D Metabolites Assessed at the Blood-Cerebrospinal Fluid Barrier

Biomolecules ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1288
Author(s):  
Sieglinde Zelzer ◽  
Andreas Meinitzer ◽  
Markus Herrmann ◽  
Walter Goessler ◽  
Dietmar Enko

The brain’s supply with vitamin D is poorly understood. Therefore, the present study aimed to determine 25-hydroxy vitamin D3 (25(OH)D) and 24,25-dihydroxy vitamin D (24,25(OH)2D3) in serum and cerebrospinal fluid (CSF) from individuals with intact and disturbed brain-CSF-barrier (BCB) function. In 292 pairs of serum and CSF samples the vitamin D metabolites were measured with liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). CSF/serum ratios (QALB, Q25(OH)D, Q24,25(OH)2D3) were calculated. Median (IQR) serum concentrations of 25(OH)D and 24,25(OH)2D3 were 63.8 (43.4–83.9) nmol/L and 4.2 (2.2–6.2) nmol/L. The CSF concentrations of both metabolites accounted for 3.7 and 3.3% of the respective serum concentrations. Serum 25(OH)D correlated inversely with Q25(OH)D and Q24,25(OH)2D3 implying a more efficient transport of both metabolites across the BCB when the serum concentration of 25(OH)D is low. In patients with BCB dysfunction, the CSF concentrations and the CSF/serum ratios of both vitamin D metabolites were higher than in individuals with intact BCB. The CSF concentrations of 25(OH)D and 24,25(OH)2D3 depend on BCB function and the respective serum concentrations of both metabolites. Higher vitamin D metabolite concentrations in CSF of patients with impaired BCB function may be due to passive diffusion across the BCB.

The Analyst ◽  
2019 ◽  
Vol 144 (1) ◽  
pp. 299-309 ◽  
Author(s):  
R. Rola ◽  
K. Kowalski ◽  
T. Bieńkowski ◽  
A. Kołodyńska-Goworek ◽  
S. Studzińska

Profiling of vitamin D metabolites in dried blood spots, including 24,25(OH)2D3, has been performed for the first time.


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