Jae Yong Chung

OATP 1 B 1 variant haplotypes were found to have a significant effect on the pharmacokinetics of pitavastatin. These results suggest that the *15 allele is associated with decreased pitavastatin uptake from blood into hepatocytes and that OATP 1 B 1 genetic polymorphisms have no effect on the pharmacokinetics of pitavastatin lactone.

Our results suggest that the UGT2B15*2 polymorphism is a major determinant of interindividual variability with respect to the pharmacokinetics and pharmacodynamics of lorazepam.

To investigate pharmacokinetic and pharmacodynamic differences of zolpidem between males and females and their causes, including CYP3A4 activity. A single oral dose of zolpidem (10 mg) was administered to 15 male and 15 female healthy subjects. Blood samples were collected up to 12 h post-dose to determine plasma zolpidem concentrations. Pharmacokinetic parameters were obtained using non-compartmental analysis. Digit symbol substitution test, choice reaction time, and visual analog scale of slee

Pharmacokinetic and pharmacodynamic profiles of lorazepam and valproate were analyzed according to uridine 5'-diphosphate-glucuronosyltransferase (UGT)2B7 genotype in 14 healthy subjects with UGT2B15*2/*2 genotype. Systemic clearance of lorazepam (2 mg intravenously) and area under the concentration-time curve (AUC) of valproate (600 mg once daily for 4 days) were analyzed as pharmacokinetic parameters, and area under the effect-time curve (AUEC) of psychomotor coordination tests (Vienna) was us

Ursodeoxycholic acid (UDCA) is a metabolic by-product of intestinal bacteria, showing hepatoprotective effects. However, its underlying molecular mechanisms remain unclear. The purpose of this study was to elucidate the action mechanisms underlying the protective effects of UDCA and vitamin E against liver dysfunction using metabolomics and metagenomic analysis. In this study, we analysed blood and urine samples from patients with obesity and liver dysfunction. Nine patients were randomly assign

We evaluated the effect of the pregnane X receptor (PXR) agonist rifampin on metformin pharmacokinetics, organic cation transporter 1 (OCT1) and OCT2 mRNA levels, and glucose levels, using the oral glucose tolerance test (OGTT) in 16 healthy subjects. The glucose-lowering effects of metformin were evaluated by OGTT before and after metformin treatment on days 1 and 2 and again on days 13 and 14 after a 10-day course of rifampin. Rifampin increased the difference in maximum glucose levels (ΔG(max

AIM: The organic cation transporter 1 (OCT1) plays a key role in the cellular transport of metformin and its subsequent glucose-lowering effect. A recent non-clinical study reported that metformin uptake into hepatocytes is regulated via OCT1, and that uptake was strongly inhibited by verapamil. Therefore, we investigated the effects of verapamil co-administration on the pharmacokinetics and pharmacodynamics of metformin in humans. METHODS: We evaluated the pharmacokinetics and the anti-hypergly

Digital therapeutics (DTx) is a new subsection of digital health that is primarily driven by software and will be of great interest to clinical pharmacologists. In this article, an overview of DTx, including definition, position in the landscape of therapeutics, product categories, benefits, and challenges, is provided. Discussions from the point of view of clinical pharmacology are presented, as DTx should have exposure-response relationships. The principles of clinical pharmacology can be appl

Pitavastatin, a 3-hydroxyl-3-methylglutaryl-coenzyme A reductase inhibitor is distributed to the liver, a target organ of action and excreted mainly into the bile. To investigate the impact of influx (OATP1B1) and efflux (MRP2, BCRP) transporter alleles on its disposition, the pharmacokinetic (PK) parameters were compared among the following groups: SLCO1B1 (*15 carrier and non-carrier), ABCC2 (G1249A, C3972T, C-24T, G1549A, and G1774T), and ABCG2 (C421A) single nucleotide polymorphisms in 45 he

The UGT1A3*2 polymorphism is correlated with increased atorvastatin lactonization and may affect its lipid-lowering effect.

LCB01-0371 is well tolerated in healthy male subjects with comparable haematology profiles to placebo, after multiple doses of up to 1200 mg twice daily for 21 days.

We hypothesized that the pharmacodynamic (PD) characteristics of metformin would change with inhibition of the multidrug and toxin extrusion (MATE) transporter, which mediates renal elimination of metformin. Twenty healthy male subjects received two doses (750/500 mg) of metformin, with and without 50 mg of pyrimethamine (a potent MATE inhibitor), with 1 week of washout in between each dose. The PD characteristics of metformin were assessed using oral glucose tolerance tests (OGTTs) before and a

Prolongation of the QT interval on an ECG is a surrogate marker for predicting the proarrhythmic potential of a drug under development. The aim of this study was to evaluate the QTc prolongation potential of two neuropsychiatric drugs, quetiapine immediate release (IR) and escitalopram, in healthy individuals. This was a randomized, open-label, 4×4 Williams crossover study, with four single-dose treatments [placebo, 400 mg moxifloxacin (positive control), 20 mg escitalopram, and 100 mg quetiapin

Tacrolimus is metabolized by CYP3A and has highly variable pharmacokinetics. To study the factors contributing to this high variability in pharmacokinetics and to investigate the possibility of genotype-specific clinical applications, the effect of differing CYP3A5 genotypes on the intrasubject coefficients of variation for tacrolimus was investigated. Genotyping for CYP3A5*3 was performed in healthy volunteers who had previously participated in the pharmacokinetic study of 2 tacrolimus formulat