Functional characterization of 27 CYP3A4 variants on macitentan metabolism in vitro

Macitentan is a new choice for pulmonary hypertension treatment which is converted to active metabolite ACT132577 by human cytochrome P450 3A4. Human cytochrome P450 3A4 often occurred gene mutations. Gene polymorphism might cause a variety of changes of protein expression and thus give rise to meta...

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Published inJournal of pharmacy and pharmacology Vol. 71; no. 11; p. 1677
Main Authors Li, Ying-Hui, Lu, Xiang-Ran, Lin, Qian-Meng, Huang, Huan-le, Liang, Xiao-Long, Cai, Jian-Ping, Cui, Ju, Hu, Guo-Xin
Format Journal Article
LanguageEnglish
Published England 01.11.2019
Subjects
Cytochrome P-450 CYP3A - genetics
Cytochrome P-450 CYP3A - metabolism
Humans
Polymorphism, Genetic - genetics
Pyrimidines - metabolism
Sulfonamides - metabolism
ACT132577
metabolism
CYP3A4
macitentan
catalytic activity
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Summary:Macitentan is a new choice for pulmonary hypertension treatment which is converted to active metabolite ACT132577 by human cytochrome P450 3A4. Human cytochrome P450 3A4 often occurred gene mutations. Gene polymorphism might cause a variety of changes of protein expression and thus give rise to metabolic difference. The aim of this study was to investigate the catalytic characteristics of 27 CYP3A4 protein variants on the metabolism of macitentan in vitro. The incubation mixtures (final volume of 200 μl in 1 m PBS) consisted of 1 pmol wild-type CYP3A4.1 or other CYP3A4 protein variants, 2.38 pmol CYP b5 and macitentan (10-600 μm) with 1 mm NADPH. All specimens were processed using same approach with acetonitrile precipitation. The metabolite of macitentan was analysed by ultra performance liquid chromatography-tandem mass spectrometry. Most CYP3A4 protein variants (CYP3A4.9, .11, .12, .13, .17, .20, .23, .24, .28, .29, .33, .34) exhibited a sharp decrease, meanwhile nearly one in five variants (CYP3A4.3, .4, .5, .10, .15, .16) showed a significant rise in intrinsic clearance. The relative clearance of CYP3A4 protein variants was ranged from 5.53 to 501.00%. Twenty-seven CYP3A4 protein variants displayed different catalytic characteristics towards macitentan in vitro, especially CYP3A4.5, .17, .20, .23. It is important to pay more attention to the dosage of macitentan in order to get better treatment for pulmonary arterial hypertension.
ISSN:2042-7158
DOI:10.1111/jphp.13153