Site-Dependent Degradation of a Non-Cleavable Auristatin-Based Linker-Payload in Rodent Plasma and Its Effect on ADC Efficacy

被引：48

作者：

Dorywalska, Magdalena ^{[1
]}

Strop, Pavel ^{[1
]}

Melton-Witt, Jody A. ^{[1
]}

Hasa-Moreno, Adela ^{[1
]}

Farias, Santiago E. ^{[1
]}

Casas, Meritxell Galindo ^{[1
]}

Delaria, Kathy ^{[1
]}

Lui, Victor ^{[1
]}

Poulsen, Kris ^{[1
]}

Sutton, Janette ^{[1
]}

Bolton, Gary ^{[1
]}

Zhou, Dahui ^{[2
]}

Moine, Ludivine ^{[2
]}

Dushin, Russell ^{[2
]}

Thomas-Toan Tran ^{[1
]}

Liu, Shu-Hui ^{[1
]}

Rickert, Mathias ^{[1
]}

Foletti, Davide ^{[1
]}

Shelton, David L. ^{[1
]}

Pons, Jaume ^{[1
]}

Rajpal, Arvind ^{[1
]}

机构：

[1] Pfizer Inc, Rinat Labs, San Francisco, CA 94080 USA

[2] Pfizer Inc, Worldwide Med Chem, Groton, CT 06340 USA

来源：

PLOS ONE | 2015年 / 10卷 / 07期

关键词：

THERAPEUTIC ACTIVITY; STABILITY; ANTIBODIES; CONJUGATE;

D O I：

10.1371/journal.pone.0132282

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The efficacy of an antibody-drug conjugate (ADC) is dependent on the properties of its linker-payload which must remain stable while in systemic circulation but undergo efficient processing upon internalization into target cells. Here, we examine the stability of a non-cleavable Amino-PEG6-based linker bearing the monomethyl auristatin D (MMAD) payload site-specifically conjugated at multiple positions on an antibody. Enzymatic conjugation with transglutaminase allows us to create a stable amide linkage that remains intact across all tested conjugation sites on the antibody, and provides us with an opportunity to examine the stability of the auristatin payload itself. We report a position-dependent degradation of the C terminus of MMAD in rodent plasma that has a detrimental effect on its potency. The MMAD cleavage can be eliminated by either modifying the C terminus of the toxin, or by selection of conjugation site. Both approaches result in improved stability and potency in vitro and in vivo. Furthermore, we show that the MMAD metabolism in mouse plasma is likely mediated by a serine-based hydrolase, appears much less pronounced in rat, and was not detected in cynomolgus monkey or human plasma. Clarifying these species differences and controlling toxin degradation to optimize ADC stability in rodents is essential to make the best ADC selection from preclinical models. The data presented here demonstrate that site selection and toxin susceptibility to mouse plasma degradation are important considerations in the design of non-cleavable ADCs, and further highlight the benefits of site-specific conjugation methods.

引用

页数：14