Pharmacokinetics and Pharmacodynamics of the Erythropoietin Mimetibody™ Construct CNTO 528 in Healthy Subjects

• Published in: Clinical pharmacokinetics 2009-01, Vol.48 (9), p.601-613
• Main Authors: Pérez-Ruixo, Juan José, Krzyzanski, Wojciech, Bouman-Thio, Esther, Miller, Bruce, Jang, Haishan, Bai, Stephen A., Zhou, Honghui, Yohrling, Jennifer, Cohen, Adam, Burggraaf, Jacobus, Franson, Kari, Davis, Hugh M.
• Format: Article
• Language: English
• Subjects: Adult; Anemia - drug therapy; Antibodies, Monoclonal - administration & dosage; Antibodies, Monoclonal - blood; Antibodies, Monoclonal - pharmacokinetics; Antibodies, Monoclonal - pharmacology; Biological and medical sciences; Computer Simulation; Drug Dosage Calculations; Erythrocyte Count; Erythropoietin; General pharmacology; Half-Life; Health aspects; Hemoglobins - analysis; Humans; Immunoglobulin Heavy Chains; Internal Medicine; Male; Medical sciences; Medicine; Medicine & Public Health; Middle Aged; Models, Biological; Original Research Article; Peptides, Cyclic; Pharmacokinetics; Pharmacokinetics. Pharmacogenetics. Drug-receptor interactions; Pharmacology; Pharmacology. Drug treatments; Pharmacology/Toxicology; Pharmacotherapy; Receptors, Erythropoietin - agonists; Recombinant Fusion Proteins - pharmacokinetics; Reticulocyte Count; Reticulocytes - drug effects; Single-Blind Method; Young Adult
• ISSN: 0312-5963; 1179-1926
• DOI: 10.2165/11317190-000000000-00000

Background and Objective Anaemia is a serious comorbidity that is common in patients with renal failure or cancer. CNTO 528 is the first Mimetibody™ developed to mimic the effects of erythropoietin (EPO), a hormone that stimulates the production of red blood cells (RBCs). The objective of this study was to develop a pharmacokinetic and pharmacodynamic model for CNTO 528 in healthy male subjects. Methods A pharmacokinetic/pharmacodynamic model for CNTO 528 was developed to describe the serum concentration versus time profile and the pharmacological responses of percentage of reticulocytes, total RBC counts and haemoglobin concentration after a single intravenous administration of CNTO 528 at 0.03, 0.09, 0.3 and 0.9 mg/kg in 24 healthy subjects. An open, linear, two-compartment model was used to characterize the pharmacokinetic parameters of CNTO 528. A catenary cell production and lifespan loss model was used to fit the pharmacodynamic data, yielding estimates of drug potency (SC 50 ), efficacy (S max ) and other pharmacodynamic parameters. Bootstrap and posterior predictive checks (PPC) were used to evaluate the model. Results Administration of CNTO 528 stimulated the production of reticulocytes, RBCs and haemoglobin. CNTO 528 exhibits a half-life of 141 hours, or approximately 5.9 days. The SC 50 was estimated to be 0.37 mg/L, indicating that low serum CNTO 528 concentration was sufficient to produce pharmacological effects. Compared with historical controls, CNTO 528 S max appears to be 2-fold higher than recombinant human EPO. Bootstrap analysis and PPCs confirmed the accuracy and precision in the parameter estimates and the adequacy of the model to describe the CNTO 528 pharmacokinetics and pharmacodynamics. Conclusion The mechanistic population model was suitable to characterize the pharmacokinetics and pharmacodynamics of intravenously administered CNTO 528 in healthy subjects. This qualified model is deemed appropriate to conduct clinical trial simulations and to support the decision-making process for dose selection in studies of EPO-stimulating agents.