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• W2158473710 startingPage "137" @default.
• W2158473710 abstract "Translation of central nervous system occupancy and clinical effect from animal models to humans has remained elusive for many pharmacological targets. The current studies evaluate the ability of a rodent pharmacokinetic/pharmacodynamic (PK/PD) modeling approach to translate ex vivo occupancy determined in rats to that observed after positron emission tomography (PET) imaging in humans for the dual serotonin transporter (SERT) and norepinephrine transporter (NET) inhibitor duloxetine. Ex vivo transporter occupancy in rat spinal cord was evaluated after single oral doses of 0.3 to 60 mg/kg. A novel methodology, based on the initial rates of association of transporter selective radioligands to tissue homogenates, was developed and validated for the assessment of ex vivo transporter occupancy. Duloxetine exhibited selectivity for occupancy of SERT over NET in rat spinal cord with ED₅₀ values of 1 and 9 mg/kg, respectively. Corresponding EC₅₀ values for the inhibition of SERT and NET based on unbound duloxetine spinal cord concentrations were 0.5 and 8 nM. An effect compartment PK/PD modeling approach was used to analyze the relationship between the time course of duloxetine plasma concentration and SERT and NET occupancy. Duloxetine inhibited SERT and NET in rat spinal cord with a plasma EC₅₀ of 2.95 and 59.0 ng/ml, respectively. Similar plasma EC₅₀ values for the inhibition of SERT (2.29–3.7 ng/ml) have been reported from human PET studies. This study illustrates the value of translational PK/PD modeling approaches and suggests that the preclinical modeling approach used in the current study is capable of predicting plasma concentrations associated with 50% occupancy of SERT in the human central nervous system." @default.
• W2158473710 created "2016-06-24" @default.
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• W2158473710 creator A5027600676 @default.
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• W2158473710 date "2012-01-10" @default.
• W2158473710 modified "2023-09-28" @default.
• W2158473710 title "Prediction of Human Serotonin and Norepinephrine Transporter Occupancy of Duloxetine by Pharmacokinetic/Pharmacodynamic Modeling in the Rat" @default.
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• W2158473710 doi "https://doi.org/10.1124/jpet.111.188417" @default.
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• W2158473710 hasPublicationYear "2012" @default.
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