Population pharmacokinetic modeling and simulation of huperzine A in elderly Chinese subjects

• Published in: Acta pharmacologica Sinica Vol. 37; no. 7; pp. 994 - 1001
• Main Authors: Sheng, Lei, Qu, Yi, Yan, Jing, Liu, Gang-yi, Wang, Wei-liang, Wang, Yi-jun, Wang, Hong-yi, Zhang, Meng-qi, Lu, Chuan, Liu, Yun, Jia, Jing-yin, Hu, Chao-ying, Li, Xue-ning, Yu, Chen, Xu, Hong-rong
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.07.2016; Nature Publishing Group
• Subjects: Aged; Aged, 80 and over; Aging - blood; Alkaloids - administration & dosage; Alkaloids - blood; Alkaloids - pharmacokinetics; Asian Continental Ancestry Group; Biomedical and Life Sciences; Biomedicine; Body Height; Body Weight; Creatinine - urine; Female; Humans; Immunology; Internal Medicine; Male; Medical Microbiology; Middle Aged; Models, Biological; Nonlinear Dynamics; Original; original-article; Pharmacology/Toxicology; Sesquiterpenes - administration & dosage; Sesquiterpenes - blood; Sesquiterpenes - pharmacokinetics; Sex Characteristics; Vaccine; modeling and simulation; elderly Chinese people; NLME; Alzheimer's disease; huperzine A; population pharmacokinetics
• ISSN: 1671-4083; 1745-7254; 1745-7254
• DOI: 10.1038/aps.2016.24

Aim: Our preliminary results show that huperzine A, an acetylcholinesterase inhibitor used to treat Alzheimer's disease (AD) patients in China, exhibits different pharmacokinetic features in elderly and young healthy subjects. However, its pharmacokinetic data in elderly subjects remains unavailable to date. Thus, we developed a population pharmacokinetic (PPK) model of huperzine A in elderly Chinese people, and identified the covariate affecting its pharmacokinetics for optimal individual administration. Methods: A total of 341 serum huperzine A concentration records was obtained from 2 completed clinical trials (14 elderly healthy subjects in a phase I pharmacokinetic study; 35 elderly AD patients in a phase II study). Population pharmacokinetic analysis was performed using the non-linear mixed-effect modeling software Phoenix NLME1.1.1. The effects of age, gender, body weight, height, creatinine, endogenous creatinine clearance rate as well as drugs administered concomitantly were analyzed. Bootstrap and visual predictive checks were used simultaneously to validate the final population pharmacokinetics models. Results: The plasma concentration-time profile of huperzine A was best described by a one-compartment model with first-order absorption and elimination. Age was identified as the covariate having significant influence on huperzine A clearance. The final PPK model of huperzine A was: CL (L/h)=2.4649 * (age/86) (−3.3856) , K a =0.6750 h −1 , V (L)=104.216. The final PPK model was demonstrated to be suitable and effective by the bootstrap and visual predictive checks. Conclusion: A PPK model of huperzine A in elderly Chinese subjects is established, which can be used to predict PPK parameters of huperzine A in the treatment of elderly AD patients.