Cited by 44Vitamin D Research StudiesPharmacogenetics and Drug MetabolismSteroid Chemistry and Biochemistry

Hydroxylation of CYP11A1-derived products of vitamin D3 metabolism by human and mouse CYP27B1

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Tang, Edith K.Y., Chen, Jianjun, Janjetovic, Zorica, Tieu, Elaine W., Slominski, Andrzej T., Li, Wei, Tuckey, Robert C.·2013·Drug Metabolism and Disposition

Abstract

CYP11A1 can hydroxylate vitamin D3 at carbons 17, 20, 22, and 23, producing a range of secosteroids which are biologically active with respect to their ability to inhibit proliferation and stimulate differentiation of various cell types, including cancer cells. As 1α-hydroxylation of the primary metabolite of CYP11A1 action, 20S-hydroxyvitamin D3 [20(OH)D3], greatly influences its properties, we examined the ability of both human and mouse CYP27B1 to 1α-hydroxylate six secosteroids generated by CYP11A1. Based on their kcat/Km values, all CYP11A1-derived metabolites are poor substrates for CYP27B1 from both species compared with 25-hydroxyvitamin D3. No hydroxylation of metabolites with a 17α-hydroxyl group was observed. 17α,20-Dihydroxyvitamin D3 acted as an inhibitor on human CYP27B1 but not the mouse enzyme. We also tested CYP27B1 activity on 20,24-, 20,25-, and 20,26-dihydroxyvitamin D3, which are products of CYP24A1 or CYP27A1 activity on 20(OH)D3. All three compounds were metabolized with higher catalytic efficiency (kcat/Km) by both mouse and human CYP27B1 than 25-hydroxyvitamin D3. CYP27B1 action on these new dihydroxy derivatives was confirmed to be 1α-hydroxylation by mass spectrometry and nuclear magnetic resonance analyses. Both 1,20,25- and 1,20,26- trihydroxyvitamin D3 were tested for their ability to inhibit melanoma (SKMEL-188) colony formation, and were significantly more active than 20(OH)D3. This study shows that CYP11A1-derived secosteroids are 1α-hydroxylated by both human and mouse CYP27B1 with low catalytic efficiency, and that the presence of a 17α-hydroxyl group completely blocks 1α-hydroxylation. In contrast, the secondary metabolites produced by subsequent hydroxylation of 20(OH)D3 at C24, C25, or C26 are very good substrates for CYP27B1.

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Authors
Tang, E. K. Y., Chen, J., Janjetovic, Z., Tieu, E. W., Slominski, A. T., Li, W., & Tuckey, R. C.
Affiliations
University of Tennessee Health Science Center (US)
Venue
Drug Metabolism and Disposition
Publisher
Elsevier BV
Published
2013-05
Volume
41
Issue
5
Pages
1112-1124
ISSN
0090-9556 (ISSN-L)
OpenAlex
W2158555665
Cited by
42
References
51
Citations by year
2026: 1 · 2024: 3 · 2023: 1 · 2022: 7 · 2021: 2 · 2020: 5 · 2019: 1 · 2018: 3 · 2017: 3 · 2016: 5 · 2015: 5 · 2014: 5 · 2013: 1
FWCI
4.25
Type
journal article
Language
en
Open access
Locations
  • Drug Metabolism and Disposition (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • UWA Profiles and Research Repository (UWA) (submittedVersion)
Funders
  • National Institutes of Health (1s10od010678-01)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR052190)
  • National Center for Research Resources (S10RR026377)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Vitamin D Research Studies
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Steroid Chemistry and Biochemistry
Keywords
CYP11A1, CYP27B1, vitamin D3 metabolism, secosteroids, 1α-hydroxylation, 25-hydroxyvitamin D3, melanoma, colony formation inhibition, enzyme inhibition
MeSH terms
Animals, Cholecalciferol, Cholesterol Side-Chain Cleavage Enzyme, Enzyme Inhibitors, Humans, Hydroxylation, Magnetic Resonance Spectroscopy, Mass Spectrometry, 25-Hydroxyvitamin D3 1-alpha-Hydroxylase, Mice

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