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Pharmacokinetics and Macrophage Inhibitory Cytokine-1 Pharmacodynamics of the Murine Double Minute 2 Inhibitor, Navtemadlin (KRT-232) in Fed and Fasted Healthy Subjects.

ABSTRACT: This single 60-mg dose, 4-period crossover study assessed the effect of food and formulation change on navtemadlin (KRT-232) pharmacokinetics (PK) and macrophage inhibitory cytokine-1 (MIC-1) pharmacodynamics. Healthy subjects (N = 30) were randomized to 3 treatment sequences, A: new tablet, fasted (reference, dosed twice); B: new tablet, 30 minutes after a high-fat meal (test 1); C: old tablet, fasted (test 2). PK/pharmacodynamic parameters were measured over 0 to 96 hours. Adverse events were mild without any discontinuations. No serious adverse events or deaths occurred. In treatment A, navtemadlin mean (coefficient of variation) maximum concentration (C_max ) was 525 (66) ng/mL, at median time to maximum concentration (t_max ) of 2 hours. Mean (coefficient of variation) area under the plasma concentration-time curve from time 0 to time t (AUC_0-t ) was 3392 (63.3) ng • h/mL, and arithmetic mean terminal half-life was 18.6 hours. Acyl glucuronide metabolite (M1)/navtemadlin AUC_0-t ratio was 0.2, and urine excretion of navtemadlin was negligible. After a meal (B vs A), navtemadlin t_max was delayed by 1 hour. Geometric least squares means ratios (90%CI) for navtemadlin C_max and AUC_0-t were 102.7% (87.4-120.6) and 81.4% (76.2-86.9), respectively. Old vs new tablet fasted formulations (C vs A) had geometric least squares means ratios (90%CI) of 78.4% (72.0-85.3) for C_max and 85.9% (80.5-91.7) for AUC_0-t . MIC-1 C_max and AUC were comparable across groups; t_max was delayed relative to navtemadlin t_max by ≈8 hours. Navtemadlin AUC_0-t and MIC-1 AUC_0-t correlated significantly. In conclusion, navtemadlin can be administered safely with or without food; the new formulation does not affect navtemadlin PK. The 60-mg navtemadlin dose elicited a reproducible and robust MIC-1 response that correlated well with navtemadlin exposure, indicating that murine double minute 2 target engagement leads to p53 activation.

SUBMITTER: Wong S

PROVIDER: S-EPMC9306949 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Background and objectiveLysergic acid diethylamide (LSD) is used recreationally and in clinical research. The aim of the present study was to characterize the pharmacokinetics and exposure-response relationship of oral LSD.MethodsWe analyzed pharmacokinetic data from two published placebo-controlled, double-blind, cross-over studies using oral administration of LSD 100 and 200 µg in 24 and 16 subjects, respectively. The pharmacokinetics of the 100-µg dose is shown for the first time and data for the 200-µg dose were reanalyzed and included. Plasma concentrations of LSD, subjective effects, and vital signs were repeatedly assessed. Pharmacokinetic parameters were determined using compartmental modeling. Concentration-effect relationships were described using pharmacokinetic-pharmacodynamic modeling.ResultsGeometric mean (95% confidence interval) maximum plasma concentration values of 1.3 (1.2-1.9) and 3.1 (2.6-4.0) ng/mL were reached 1.4 and 1.5 h after administration of 100 and 200 µg LSD, respectively. The plasma half-life was 2.6 h (2.2-3.4 h). The subjective effects lasted (mean ± standard deviation) 8.2 ± 2.1 and 11.6 ± 1.7 h for the 100- and 200-µg LSD doses, respectively. Subjective peak effects were reached 2.8 and 2.5 h after administration of LSD 100 and 200 µg, respectively. A close relationship was observed between the LSD concentration and subjective response within subjects, with moderate counterclockwise hysteresis. Half-maximal effective concentration values were in the range of 1 ng/mL. No correlations were found between plasma LSD concentrations and the effects of LSD across subjects at or near maximum plasma concentration and within dose groups.ConclusionsThe present pharmacokinetic data are important for the evaluation of clinical study findings (e.g., functional magnetic resonance imaging studies) and the interpretation of LSD intoxication. Oral LSD presented dose-proportional pharmacokinetics and first-order elimination up to 12 h. The effects of LSD were related to changes in plasma concentrations over time, with no evidence of acute tolerance.Trial registrationNCT02308969, NCT01878942.

Project description:STUDY OBJECTIVE:To investigate the pharmacodynamic and pharmacokinetic profiles of fluticasone furoate (FF)/vilanterol (VI) - a fixed-dose combination of an inhaled corticosteroid (ICS) and a long-acting ?2 -agonist for the treatment of asthma and chronic obstructive pulmonary disease - after single and repeat administration in healthy Chinese subjects. DESIGN:Double-blind, placebo-controlled, single-site, randomized, four-way crossover study. SETTING:The Clinical Pharmacological Research Centre at Peking Union Medical College Hospital [PUMCH]) in Beijing, China. SUBJECTS:Sixteen healthy, nonsmoking Chinese adults. INTERVENTION:Subjects were randomized to receive FF/VI 50/25, 100/25, or 200/25 ?g, or placebo once/daily in the morning, delivered by the Ellipta dry powder inhaler, for 7 consecutive days. The subjects then received the other three treatments, with each treatment period separated by a 7-day washout period. MEASUREMENTS AND MAIN RESULTS:The co-primary outcome measures reflected pharmacodynamic responses relating to recognized class effects of the two drug classes: reduced serum cortisol level (ICSs), and increased Fridericia's corrected QT interval (QTcF) and reduced serum potassium level (long-acting ?2 -agonists). Co-primary pharmacodynamic endpoints were 0-24-hour weighted mean serum cortisol level on day 7 (cortisol0-24 hr, Day 7 ), and 0-4-hour weighted mean and maximum QTcF and weighted mean and minimum serum potassium level on days 1 and 7. Fluticasone furoate and VI plasma concentrations, derived pharmacokinetic parameters, and safety were also assessed. Of the 16 subjects randomized, 15 completed the study. Reductions in cortisol0-24 hour, Day 7 of 15% and 25% were observed with FF/VI 100/25 and 200/25 ?g, respectively, versus placebo. Minor increases (< 10 msec) in maximum QTcF on day 7 were seen with FF/VI 50/25 and 100/25 ?g but not with 200/25 ?g. Slight decreases in serum potassium level were only observed in subjects receiving FF/VI 50/25 ?g on day 1 and FF/VI 50/25 and 200/25 ?g on day 7. Fluticasone furoate accumulation (day 7 vs day 1) for FF/VI 50/25-200/25 ?g ranged from 38 to 54% for maximum observed concentration and 63-71% for area under the concentration-time curve from 0 to 4 hours. Fluticasone furoate pharmacokinetics were less than dose proportional. The VI pharmacokinetic profiles were similar for all three FF/VI doses. Adverse events were all mild in intensity and were reported by 13 (81%) of the 16 subjects. CONCLUSION:In healthy Chinese subjects, minimal and non-clinically relevant ?-adrenergic pharmacodynamic effects were observed with FF/VI doses ranging from 50/25 to 200/25 ?g. FF dose-dependent reductions in serum cortisol levels of 15-25% were seen after administration of FF/VI 100/25 and 200/25 ?g. FF/VI was safe and well tolerated in these subjects at doses ranging from 50/25 to 200/25 ?g.

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Pharmacokinetics and Macrophage Inhibitory Cytokine-1 Pharmacodynamics of the Murine Double Minute 2 Inhibitor, Navtemadlin (KRT-232) in Fed and Fasted Healthy Subjects.

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