Abstract:
:A quaternary ammonium-based drug-linker has been developed to expand the scope of antibody-drug conjugate (ADC) payloads to include tertiary amines, a functional group commonly present in biologically active compounds. The linker strategy was exemplified with a β-glucuronidase-cleavable auristatin E construct. The drug-linker was found to efficiently release free auristatin E (AE) in the presence of β-glucuronidase and provide ADCs that were highly stable in plasma. Anti-CD30 conjugates comprised of the glucuronide-AE linker were potent and immunologically specific in vitro and in vivo, displaying pharmacologic properties comparable with a carbamate-linked glucuronide-monomethylauristatin E control. The quaternary ammonium linker was then applied to a tubulysin antimitotic drug that contained an N-terminal tertiary amine that was important for activity. A glucuronide-tubulysin quaternary ammonium linker was synthesized and evaluated as an ADC payload, in which the resulting conjugates were found to be potent and immunologically specific in vitro, and displayed a high level of activity in a Hodgkin lymphoma xenograft. Furthermore, the results were superior to those obtained with a related tubulysin derivative containing a secondary amine N-terminus for conjugation using previously known linker technology. The quaternary ammonium linker represents a significant advance in linker technology, enabling stable conjugation of payloads with tertiary amine residues. Mol Cancer Ther; 15(5); 938-45. ©2016 AACR.
journal_name
Mol Cancer Therjournal_title
Molecular cancer therapeuticsauthors
Burke PJ,Hamilton JZ,Pires TA,Setter JR,Hunter JH,Cochran JH,Waight AB,Gordon KA,Toki BE,Emmerton KK,Zeng W,Stone IJ,Senter PD,Lyon RP,Jeffrey SCdoi
10.1158/1535-7163.MCT-16-0038subject
Has Abstractpub_date
2016-05-01 00:00:00pages
938-45issue
5eissn
1535-7163issn
1538-8514pii
1535-7163.MCT-16-0038journal_volume
15pub_type
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