Abstract
Purpose
Monoamine oxidases (MAOs) are non-CYP enzymes that contribute to systemic elimination of therapeutic agents, and localized on mitochondrial membranes. The aim of the present study was to validate quantitative estimation of metabolic clearance of MAO substrate drugs using human liver microsomes (HLMs).
Methods
Three MAO substrate drugs, sumatriptan, rizatriptan and phenylephrine, as well as four CYP substrates were selected, and their disappearance during incubation with HLMs or mitochondria (HLMt) was measured. Metabolic clearance (CL) was then calculated from the disappearance curve.
Results
CL obtained in HLMs for sumatriptan and a typical MAO substrate serotonin was correlated with that obtained in HLMt among ten human individual livers. Hepatic intrinsic clearance (CLint,vitro) estimated from CL in HLMs was 14–20 and 2–5 times lower than in vivo hepatic intrinsic clearance (CLint,vivo) obtained from literature for MAO and CYP substrates, respectively. Utilization of HLMs for quantitatively assessing metabolic clearance of MAO substrates was further validated by proteomics approach which has revealed that numerous proteins localized on inner and outer membranes of mitochondria were detected in both HLMs and HLMt.
Conclusion
CLint,vitro values of MAO substrate drugs can be quantitatively estimated with HLMs and could be used for semi-quantitative prediction of CLint,vivo values.
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Abbreviations
- CL:
-
In vitro metabolic clearance
- CLint :
-
Intrinsic clearance
- CYP:
-
Cytochrome P450
- HLMs:
-
Human liver microsomes
- HLMt:
-
Human liver mitochondria
- IVIVE:
-
In vitro-in vivo extrapolation
- LC-MS/MS:
-
Liquid chromatography-mass spectrometry/mass spectrometry
- MAO:
-
Monoamine oxidase
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
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Masuo, Y., Nagamori, S., Hasegawa, A. et al. Utilization of Liver Microsomes to Estimate Hepatic Intrinsic Clearance of Monoamine Oxidase Substrate Drugs in Humans. Pharm Res 34, 1233–1243 (2017). https://doi.org/10.1007/s11095-017-2140-4
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DOI: https://doi.org/10.1007/s11095-017-2140-4