Pharmacokinetics of the estrogen receptor subtype-selective ligands, PPT and DPN: Quantification using UPLC-ES/MS/MS

Estatira Sepehr, Marketa Lebl-Rinnova, Meagan K. Mann, Samantha L. Pisani, Mona I. Churchwell, Donna L Korol, John A. Katzenellenbogen, Daniel R. Doerge

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Estrogen receptor (ER) subtype specific agonists, diarylpropionitrile (DPN) for ERβ and propylpyrazoletriol (PPT) for ERα, are pharmacological probes used frequently to define mechanisms for estrogen actions in vitro and in vivo. Quantitative analytical methodology was developed and validated for DPN and PPT, based on synthetic stable labeled analogs (DPN-d4 and PPT-d5) using isotope dilution liquid chromatographic tandem electrospray mass spectrometric detection. The validated method produced high sensitivity, with detection limits of 0.04-0.07ng/ml serum. Serum pharmacokinetics were evaluated in Long-Evans rats following a single subcutaneous injection (2mg/kg bw) of both compounds. The role of Phase II metabolism was evaluated using β-glucuronidase and arylsulfatase hydrolysis to measure total DPN and PPT in addition to the parent compounds. The pharmacokinetic properties of DPN and PPT reported could facilitate experimental designs requiring specified levels of receptor occupancy for quantitative comparisons of ER subtype specificities for natural and synthetic estrogens in vivo.

Original languageEnglish (US)
Pages (from-to)119-126
Number of pages8
JournalJournal of Pharmaceutical and Biomedical Analysis
Volume71
DOIs
StatePublished - Dec 2012
Externally publishedYes

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Keywords

  • Estrogen receptor subtypes
  • Isotope dilution quantification
  • Mass spectrometry
  • Pharmacokinetics
  • Synthetic deuterium labeling

ASJC Scopus subject areas

  • Analytical Chemistry
  • Drug Discovery
  • Pharmaceutical Science
  • Spectroscopy
  • Clinical Biochemistry

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