Application of Isotopic Ratio Mass Spectrometry for the in Vitro Determination of Demethylation Activity in Human Liver Microsomes Using N-methyl-13C-Labeled Substrates

2002 ◽  
Vol 306 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Florence Grand ◽  
Izzet Kilinc ◽  
Albert Sarkis ◽  
Jérôme Guitton
Keyword(s):  
Mass Spectrometry ◽  
Human Liver ◽  
Isotopic Ratio ◽  
Liver Microsomes ◽  
Human Liver Microsomes ◽  
Demethylation Activity

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.

In vitro metabolism of corydaline in human liver microsomes and hepatocytes using liquid chromatography-ion trap mass spectrometry

2012 ◽  
Vol 35 (9) ◽  
pp. 1102-1109 ◽  
Author(s):  
Hye Young Ji ◽  
Hyeri Lee ◽  
Jeong-Han Kim ◽  
Ki Hyun Kim ◽  
Kang Ro Lee ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Human Liver ◽  
Ion Trap ◽  
Liver Microsomes ◽  
Human Liver Microsomes ◽  
In Vitro Metabolism ◽  
Ion Trap Mass Spectrometry

15-Desmethyl FK-506 and 15,31-desmethyl FK-506 from human liver microsomes: isolation, identification (by fast atom bombardment mass spectrometry and NMR), and evaluation of in vitro immunosuppressive activity

1994 ◽  
Vol 40 (5) ◽  
pp. 740-744 ◽  
Author(s):  
G J Lhöest ◽  
N Maton ◽  
D Latinne ◽  
A Laurent ◽  
R K Verbeeck
Keyword(s):  
Mass Spectrometry ◽  
Human Liver ◽  
Fast Atom Bombardment ◽  
Liver Microsomes ◽  
Reversed Phase ◽  
Human Liver Microsomes ◽  
Resonance Spectroscopy ◽  
Immunosuppressive Activity ◽  
Fk 506

Abstract 15-Desmethyl FK-506 and 15,31-desmethyl FK-506 metabolites extracted from incubated human liver microsomes were separated by normal and reversed-phase HPLC. The metabolites were identified by fast atom bombardment/mass spectrometry and nuclear magnetic resonance spectroscopy. The in vitro 50% inhibitory concentration, tested against bidirectional mixed lymphocyte reactions, was 325 mg/L for 15,31-desmethyl FK-506 and 4 mg/L for 15-desmethyl FK-506, indicating that these products of FK-506 demethylation retain in vitro immunosuppressive activity.

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