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06.11.2019 | Original Paper

Expression of vitamin D receptor, CYP27B1 and CYP24A1 hydroxylases and 1,25-dihydroxyvitamin D3 levels in stone formers

verfasst von: Thalita Lima Melo, Priscila Ligeiro Gonçalves Esper, Lysien Ivania Zambrano, Milene Subtil Ormanji, Fernanda Guedes Rodrigues, Ita Pfeferman Heilberg

Erschienen in: Urolithiasis | Ausgabe 1/2020

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Abstract

The expression of vitamin D receptor (VDR) and 1,25-dihydroxyvitamin D3 [1,25(OH)D] levels exceed the values of controls in some but not all hypercalciuric stone formers (HSF). We aimed to evaluate serum 1,25(OH)D levels, the expression of VDR, CYP27B1, and CYP24A1 hydroxylases in HSF in comparison with normocalciuric stone formers (NSF) and healthy subjects (HS). Blood samples, 24-h urine collections and a 3-day dietary record were obtained from 30 participants from each of the groups. The expression of VDR, CYP27B1, and CYP24A1 was measured by flow cytometry. HSF presented significantly higher urinary volume, sodium, magnesium, oxalate, uric acid, and phosphorus than NSF and HS. Calcium intake was lower in HSF versus NSF and HS (442 ± 41 vs 594 ± 42 and 559 ± 41 mg/day, respectively, p = 0.027). Ionized calcium was significantly lower in HSF than NSF (1.29 ± 0.0 vs 1.31 ± 0.0 mmol/L, p < 0.01). Serum 1,25(OH)D was significantly higher in HSF and NSF than HS (22.5 ± 1.2; 22.2 ± 1.2 vs 17.4 ± 1.2 pg/ml, p = 0.007) but serum 25(OH)D, PTH, klotho and plasma FGF-23 did not differ between groups. VDR expression was higher in HSF and NSF than HS (80.8 ± 3.2; 78.7 ± 3.3 vs 68.6 ± 3.2%, p = 0.023). Although CYP27B1 and CYP24A1 expressions were similar among all groups, the ratio of 1,25(OH)D/CYP24A1 was higher in HSF and NSF than in HS (1.43 ± 0.25 and 0.56 ± 0.10 vs 0.34 ± 0.06, p = 0.00). Stone formers, regardless of urinary calcium excretion, had higher VDR expression and 1,25(OH)D levels than HS, even in ranges considered normal. Higher 1,25(OH)D/CYP24A1 ratio suggested a lower degradation of 1,25(OH)D by CYP24A1 in HSF and NSF.
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Metadaten
Titel
Expression of vitamin D receptor, CYP27B1 and CYP24A1 hydroxylases and 1,25-dihydroxyvitamin D3 levels in stone formers
verfasst von
Thalita Lima Melo
Priscila Ligeiro Gonçalves Esper
Lysien Ivania Zambrano
Milene Subtil Ormanji
Fernanda Guedes Rodrigues
Ita Pfeferman Heilberg
Publikationsdatum
06.11.2019
Verlag
Springer Berlin Heidelberg
Erschienen in
Urolithiasis / Ausgabe 1/2020
Print ISSN: 2194-7228
Elektronische ISSN: 2194-7236
DOI
https://doi.org/10.1007/s00240-019-01163-9

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