A Novel P450-Catalyzed Transformation of the 2,2,6,6-Tetramethyl Piperidine Moiety to a 2,2-Dimethyl Pyrrolidine in Human Liver Microsomes: Characterization by High Resolution Quadrupole-Time-of-Flight Mass Spectrometry and 1H-NMR

2003 ◽  
Vol 31 (2) ◽  
pp. 215-223 ◽  
Author(s):  
Wenji Yin ◽  
George A. Doss ◽  
Ralph A. Stearns ◽  
Ashok G. Chaudhary ◽  
Cornelis E. Hop ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
1H Nmr ◽  
Human Liver ◽  
Liver Microsomes ◽  
Time Of Flight ◽  
Human Liver Microsomes ◽  
Flight Mass Spectrometry

scholarly journals Nontargeted Metabolomics by High-Resolution Mass Spectrometry to Study the In Vitro Metabolism of a Dual Inverse Agonist of Estrogen-Related Receptors β and γ, DN203368

Pharmaceutics ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 776
Author(s):  
Sin-Eun Kim ◽  
Seung-Bae Ji ◽  
Euihyeon Kim ◽  
Minseon Jeong ◽  
Jina Kim ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Human Liver ◽  
High Resolution Mass Spectrometry ◽  
Liver Microsomes ◽  
Human Liver Microsomes ◽  
Rat Liver Microsomes ◽  
High Resolution Mass ◽  
Resolution Mass

DN203368 ((E)-3-[1-(4-[4-isopropylpiperazine-1-yl]phenyl) 3-methyl-2-phenylbut-1-en-1-yl] phenol) is a 4-hydroxy tamoxifen analog that is a dual inverse agonist of estrogen-related receptor β/γ (ERRβ/γ). ERRγ is an orphan nuclear receptor that plays an important role in development and homeostasis and holds potential as a novel therapeutic target in metabolic diseases such as diabetes mellitus, obesity, and cancer. ERRβ is also one of the orphan nuclear receptors critical for many biological processes, such as development. We investigated the in vitro metabolism of DN203368 by conventional and metabolomic approaches using high-resolution mass spectrometry. The compound (100 μM) was incubated with rat and human liver microsomes in the presence of NADPH. In the metabolomic approach, the m/z value and retention time information obtained from the sample and heat-inactivated control group were statistically evaluated using principal component analysis and orthogonal partial least-squares discriminant analysis. Significant features responsible for group separation were then identified using tandem mass spectra. Seven metabolites of DN203368 were identified in rat liver microsomes and the metabolic pathways include hydroxylation (M1-3), N-oxidation (M4), N-deisopropylation (M5), N,N-dealkylation (M6), and oxidation and dehydrogenation (M7). Only five metabolites (M2, M3, and M5-M7) were detected in human liver microsomes. In the conventional approach using extracted ion monitoring for values of mass increase or decrease by known metabolic reactions, only five metabolites (M1-M5) were found in rat liver microsomes, whereas three metabolites (M2, M3, and M5) were found in human liver microsomes. This study revealed that nontargeted metabolomics combined with high-resolution mass spectrometry and multivariate analysis could be a more efficient tool for drug metabolite identification than the conventional approach. These results might also be useful for understanding the pharmacokinetics and metabolism of DN203368 in animals and humans.

scholarly journals Identification of ML106 Phase 1 Metabolites in Human Liver Microsomes Using High-Resolution Quadrupole-Orbitrap Mass Spectrometry

2016 ◽  
Vol 7 (3) ◽  
pp. 69-73 ◽  
Author(s):  
Jun Hyeon Jo ◽  
WoongShik Nam ◽  
Sunjoo Kim ◽  
Doohyun Lee ◽  
Kyung Hoon Min ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Human Liver ◽  
Phase 1 ◽  
Liver Microsomes ◽  
Human Liver Microsomes ◽  
Orbitrap Mass Spectrometry
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