Using complementary mass spectrometric approaches for the determination of methylprednisolone metabolites in human urine

Using complementary mass spectrometric approaches for the determination of methylprednisolone metabolites in human urine / Oscar J. Pozo, Josep Marcos, Xavier Matabosch, Rosa Ventura, Jordi Segura. - (Rapid Communcations in Mass Spectrometry 26 (2012) 5 (15 March); p. 541-553)

  • PMID: 22302494
  • DOI: 10.1002/rcm.6129


Abstract

Rationale: The metabolism of methylprednisolone is revisited in order to find new metabolites that could be important for distinguishing between different routes of administration. Recently developed liquid chromatography/tandem mass spectrometry (LC/MS/MS) strategies for the detection of corticosteroid metabolites have been applied to the study of methylprednisolone metabolism.

Methods: The structures of these metabolites were studied using two complementary mass spectrometric techniques: LC/MS/MS in product ion scan mode with electrospray ionization and gas chromatography/mass spectrometry (GC/MS) in full scan mode with electron ionization. Metabolites were also isolated by semipreparative liquid chromatography fractionation. Each fraction was divided into two aliquots; one was studied by LC/MS/MS and the other by GC/MS after methoxyamine-trimethylsilyl derivatization.

Results: The combination of all the structural information allowed us to propose a comprehensive picture of methylprednisolone metabolism in humans. Overall, 15 metabolites including five previously unreported compounds have been detected. Specifically, 16β,17α,21-trihydroxy-6α-methylpregna-1,4-diene-3,11,20-trione, 17α,20β,21-trihydroxy-6α-methylpregna-1,4-diene-3, 11-dione, 11β,17α,21-trihydroxy-6α-hydroxymethylpregna-1,4-diene-3,20-dione, 11β,17α,20ξ,21-tetrahydroxy-6α-hydroxymethylpregna-1,4-diene-3-one, and 17α,21-dihydroxy-6α-hydroxymethylpregna-1,4-diene-3,11,20-trione are proposed as feasible structures for the novel metabolites. In addition to the expected biotransformations: reduction of the C20 carbonyl, oxidation of the C11 hydroxy group, and further 6β-hydroxylation, we propose that hydroxylation of the 6α-methyl group can also take place.

Conclusions: New metabolites have been identified in urine samples collected after oral administration of 40 mg of methylprednisolone. All identified metabolites were found in all samples collected up to 36 h after oral administration. However, after topical administration of 5 g of methylprednisolone aceponate, neither the parent compound nor any of the metabolites were detected.

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Science
Research / Study
Date
2 March 2012
People
Marcos, J.
Matabosch, Xavier
Pozo, Óscar J.
Segura, Jordi
Ventura, Rosa
Country
Spain
Language
English
Other organisations
Institut Hospital de Mar d'Investigacions Mèdiques (IMIM) - Hospital del Mar Medical Research Institute
Universitat Pompeu Fabra (UPF) - Pompeu Fabra University
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Mass spectrometry analysis
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S9. Glucocorticosteroids
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Methylprednisolone
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20 July 2021
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27 July 2021
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