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Petersen ME, Brant MG, Lasalle M, Das S, Duan R, Wong J, Ding T, Wu KJ, Siddappa D, Fang C, Zhang W, Wu AML, Hirkala-Schaefer T, Garnett GAE, Fung V, Yang L, Hernandez Rojas A, Lawn SO, Barnscher SD, Rich JR, Colombo R. Design and Evaluation of ZD06519, a Novel Camptothecin Payload for Antibody Drug Conjugates. Mol Cancer Ther 2024; 23:606-618. [PMID: 38354417 PMCID: PMC11063767 DOI: 10.1158/1535-7163.mct-23-0822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/08/2024] [Accepted: 02/09/2024] [Indexed: 02/16/2024]
Abstract
In recent years, the field of antibody drug conjugates (ADC) has seen a resurgence, largely driven by the clinical benefit observed in patients treated with ADCs incorporating camptothecin-based topoisomerase I inhibitor payloads. Herein, we present the development of a novel camptothecin ZD06519 (FD1), which has been specifically designed for its application as an ADC payload. A panel of camptothecin analogs with different substituents at the C-7 and C-10 positions of the camptothecin core was prepared and tested in vitro. Selected compounds spanning a range of potency and hydrophilicity were elaborated into drug-linkers, conjugated to trastuzumab, and evaluated in vitro and in vivo. ZD06519 was selected on the basis of its favorable properties as a free molecule and as an antibody conjugate, which include moderate free payload potency (∼1 nmol/L), low hydrophobicity, strong bystander activity, robust plasma stability, and high-monomeric ADC content. When conjugated to different antibodies using a clinically validated MC-GGFG-based linker, ZD06519 demonstrated impressive efficacy in multiple cell line-derived xenograft models and noteworthy tolerability in healthy mice, rats, and non-human primates.
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Affiliation(s)
- Mark E. Petersen
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Michael G. Brant
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Manuel Lasalle
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Samir Das
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Renee Duan
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Jodi Wong
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Tong Ding
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Kaylee J. Wu
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Dayananda Siddappa
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Chen Fang
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Wen Zhang
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Alex M. L. Wu
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | | | - Graham A. E. Garnett
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Vincent Fung
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Luying Yang
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | | | - Samuel O. Lawn
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Stuart D. Barnscher
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Jamie R. Rich
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
| | - Raffaele Colombo
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, British Columbia, Canada
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Brant MG, Garnett GAE, Guedia J, Lasalle M, Lawn S, Petersen ME, Duan R, Mendez-Campos J, Hirkala-Schaefer T, Winters GC, Barnscher SD. Generation and structure-activity relationships of novel imidazo-thienopyridine based TLR7 agonists: application as payloads for immunostimulatory antibody drug-conjugates. Bioorg Med Chem Lett 2023; 91:129348. [PMID: 37217025 DOI: 10.1016/j.bmcl.2023.129348] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 05/19/2023] [Indexed: 05/24/2023]
Abstract
Pairing immunostimulatory small molecules with the targeting capability of an antibody has emerged as a novel therapeutic modality with the potential to treat a variety of solid tumors. A series of compounds based on an imidazo-thienopyridine scaffold were synthesized and tested for their ability to agonize the innate immune sensors toll-like receptor 7 and 8 (TLR7/8). Structure-activity relationship (SAR) studies revealed that certain simple amino-substituents could enable TLR7 agonism at low nanomolar concentrations. Drug-linkers containing either payload 1 or 20h were conjugated to the HER2-targeting antibody trastuzumab at the interchain disulfide cysteine residues using a cleavable valine-citrulline dipeptide linker and stochastic thiol-maleimide chemistry. In vitro, these immune-stimulating antibody drug-conjugates (ADCs) were found to induce cytokine release in a murine splenocyte assay when co-cultured with the HER2-high NCI-N87 cancer cell line. In vivo, tumor regression was observed with a single dose in an NCI-N87 gastric carcinoma xenograft model in BALB/c nude mice.
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Affiliation(s)
- Michael G Brant
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, BC, Canada.
| | | | - Joy Guedia
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, BC, Canada
| | - Manuel Lasalle
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, BC, Canada
| | - Samuel Lawn
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, BC, Canada
| | - Mark E Petersen
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, BC, Canada
| | - Renee Duan
- ADC Therapeutic Development, Zymeworks Inc., Vancouver, BC, Canada
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