A novel disulfide linker was designed to enable a direct connection between cytotoxic pyrrolobenzodiazepine (PBD) drugs and the cysteine on a targeting antibody for use in antibody-drug conjugates (ADCs). ADCs composed of a cysteine-engineered antibody were armed with a PBD using a self-immolative disulfide linker. Both the chemical linker and the antibody site were optimized for this new bioconjugation strategy to provide a highly stable and efficacious ADC. This novel disulfide ADC was compared with a conjugate containing the same PBD drug, but attached to the antibody via a peptide linker. Both ADCs had similar efficacy in mice bearing human tumor xenografts. Safety studies in rats revealed that the disulfide-linked ADC had a higher MTD than the peptide-linked ADC. Overall, these data suggest that the novel self-immolative disulfide linker represents a valuable way to construct ADCs with equivalent efficacy and improved safety. (C) 2017 AACR.
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Kings Coll London, Inst Pharmaceut Sci, Britannia House,7 Trinity St, London SE1 1DB, England
Femtogenix Ltd, Britannia House,7 Trinity St, London SE1 1DB, EnglandKings Coll London, Inst Pharmaceut Sci, Britannia House,7 Trinity St, London SE1 1DB, England
Mantaj, Julia
Jackson, Paul J. M.
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Kings Coll London, Inst Pharmaceut Sci, Britannia House,7 Trinity St, London SE1 1DB, England
Femtogenix Ltd, Britannia House,7 Trinity St, London SE1 1DB, EnglandKings Coll London, Inst Pharmaceut Sci, Britannia House,7 Trinity St, London SE1 1DB, England
Jackson, Paul J. M.
Rahman, Khondaker M.
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Kings Coll London, Inst Pharmaceut Sci, Britannia House,7 Trinity St, London SE1 1DB, England
Femtogenix Ltd, Britannia House,7 Trinity St, London SE1 1DB, EnglandKings Coll London, Inst Pharmaceut Sci, Britannia House,7 Trinity St, London SE1 1DB, England
Rahman, Khondaker M.
Thurston, David E.
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Femtogenix Ltd, Britannia House,7 Trinity St, London SE1 1DB, England
Kings Coll London, Fac Life Sci & Med, Inst Pharmaceut Sci, Drug Discovery, Britannia House,7 Trinity St, London SE1 1DB, EnglandKings Coll London, Inst Pharmaceut Sci, Britannia House,7 Trinity St, London SE1 1DB, England