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Anti-PCSK9 Antibody Pharmacokinetics and Low-Density Lipoprotein-Cholesterol Pharmacodynamics in Nonhuman Primates Are Antigen Affinity-Dependent and Exhibit Limited Sensitivity to Neonatal Fc Receptor-Binding Enhancement.

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2015

J Pharmacol Exp Ther. 2015 Apr;353(1):119-31. doi: 10.1124/jpet.114.221242. Epub 2015 Feb 4.

Anti-PCSK9 Antibody Pharmacokinetics and Low-Density Lipoprotein-Cholesterol Pharmacodynamics in Nonhuman Primates Are Antigen Affinity-Dependent and Exhibit Limited Sensitivity to Neonatal Fc Receptor-Binding Enhancement.

KR Henne;B Ason;M Howard;W Wang;J Sun;J Higbee;J Tang;KC Matsuda;R Xu;L Zhou;JC Chan;C King;DE Piper;RR Ketchem;ML Michaels;SM Jackson;MW Retter

Amgen, South San Francisco, California, USA.

Service type: Knockout mice

Abstract

Proprotein convertase subtilisin/kexin type 9 (PCSK9) has emerged as an attractive therapeutic target for cardiovascular disease. Monoclonal antibodies (mAbs) that bind PCSK9 and prevent PCSK9:low-density lipoprotein receptor complex formation reduce serum low-density lipoprotein-cholesterol (LDL-C) in vivo. PCSK9-mediated lysosomal degradation of bound mAb, however, dramatically reduces mAb exposure and limits duration of effect. Administration of high-affinity mAb1:PCSK9 complex (1:2) to mice resulted in significantly lower mAb1 exposure compared with mAb1 dosed alone in normal mice or in PCSK9 knockout mice lacking antigen. To identify mAb-binding characteristics that minimize lysosomal disposition, the pharmacokinetic behavior of four mAbs representing a diverse range of PCSK9-binding affinities at neutral (serum) and acidic (endosomal) pH was evaluated in cynomolgus monkeys. Results revealed an inverse correlation between affinity and both mAb exposure and duration of LDL-C lowering. High-affinity mAb1 exhibited the lowest exposure and shortest duration of action (6 days), whereas mAb2 displayed prolonged exposure and LDL-C reduction (51 days) as a consequence of lower affinity and pH-sensitive PCSK9 binding. mAbs with shorter endosomal PCSK9:mAb complex dissociation half-lives (

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