1
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Liang J, Zbieg JR, Blake RA, Chang JH, Daly S, DiPasquale AG, Friedman LS, Gelzleichter T, Gill M, Giltnane JM, Goodacre S, Guan J, Hartman SJ, Ingalla ER, Kategaya L, Kiefer JR, Kleinheinz T, Labadie SS, Lai T, Li J, Liao J, Liu Z, Mody V, McLean N, Metcalfe C, Nannini MA, Oeh J, O'Rourke MG, Ortwine DF, Ran Y, Ray NC, Roussel F, Sambrone A, Sampath D, Schutt LK, Vinogradova M, Wai J, Wang T, Wertz IE, White JR, Yeap SK, Young A, Zhang B, Zheng X, Zhou W, Zhong Y, Wang X. GDC-9545 (Giredestrant): A Potent and Orally Bioavailable Selective Estrogen Receptor Antagonist and Degrader with an Exceptional Preclinical Profile for ER+ Breast Cancer. J Med Chem 2021; 64:11841-11856. [PMID: 34251202 DOI: 10.1021/acs.jmedchem.1c00847] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Breast cancer remains a leading cause of cancer death in women, representing a significant unmet medical need. Here, we disclose our discovery efforts culminating in a clinical candidate, 35 (GDC-9545 or giredestrant). 35 is an efficient and potent selective estrogen receptor degrader (SERD) and a full antagonist, which translates into better antiproliferation activity than known SERDs (1, 6, 7, and 9) across multiple cell lines. Fine-tuning the physiochemical properties enabled once daily oral dosing of 35 in preclinical species and humans. 35 exhibits low drug-drug interaction liability and demonstrates excellent in vitro and in vivo safety profiles. At low doses, 35 induces tumor regressions either as a single agent or in combination with a CDK4/6 inhibitor in an ESR1Y537S mutant PDX or a wild-type ERα tumor model. Currently, 35 is being evaluated in Phase III clinical trials.
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Affiliation(s)
- Jun Liang
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jason R Zbieg
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Robert A Blake
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jae H Chang
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Stephen Daly
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Antonio G DiPasquale
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Lori S Friedman
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Thomas Gelzleichter
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Matthew Gill
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Jennifer M Giltnane
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Simon Goodacre
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Jane Guan
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Steven J Hartman
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Ellen Rei Ingalla
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Lorn Kategaya
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - James R Kiefer
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Tracy Kleinheinz
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Sharada S Labadie
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Tommy Lai
- WuXi AppTec Co., Ltd., 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, P. R. China
| | - Jun Li
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jiangpeng Liao
- WuXi AppTec Co., Ltd., 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, P. R. China
| | - Zhiguo Liu
- WuXi AppTec Co., Ltd., 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, P. R. China
| | - Vidhi Mody
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Neville McLean
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Ciara Metcalfe
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Michelle A Nannini
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jason Oeh
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Martin G O'Rourke
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Daniel F Ortwine
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Yingqing Ran
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Nicholas C Ray
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Fabien Roussel
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Amy Sambrone
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Deepak Sampath
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Leah K Schutt
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Maia Vinogradova
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - John Wai
- WuXi AppTec Co., Ltd., 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, P. R. China
| | - Tao Wang
- WuXi AppTec Co., Ltd., 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, P. R. China
| | - Ingrid E Wertz
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jonathan R White
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Siew Kuen Yeap
- Charles River Discovery Research Services UK Limited, 7-9 Spire Green Center, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Amy Young
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Birong Zhang
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Xiaoping Zheng
- WuXi AppTec Co., Ltd., 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, P. R. China
| | - Wei Zhou
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Yu Zhong
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Xiaojing Wang
- Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
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2
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Dragovich PS, Pillow TH, Blake RA, Sadowsky JD, Adaligil E, Adhikari P, Chen J, Corr N, Dela Cruz-Chuh J, Del Rosario G, Fullerton A, Hartman SJ, Jiang F, Kaufman S, Kleinheinz T, Kozak KR, Liu L, Lu Y, Mulvihill MM, Murray JM, O'Donohue A, Rowntree RK, Sawyer WS, Staben LR, Wai J, Wang J, Wei B, Wei W, Xu Z, Yao H, Yu SF, Zhang D, Zhang H, Zhang S, Zhao Y, Zhou H, Zhu X. Antibody-Mediated Delivery of Chimeric BRD4 Degraders. Part 2: Improvement of In Vitro Antiproliferation Activity and In Vivo Antitumor Efficacy. J Med Chem 2021; 64:2576-2607. [PMID: 33596073 DOI: 10.1021/acs.jmedchem.0c01846] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [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] [Indexed: 12/14/2022]
Abstract
Heterobifunctional compounds that direct the ubiquitination of intracellular proteins in a targeted manner via co-opted ubiquitin ligases have enormous potential to transform the field of medicinal chemistry. These chimeric molecules, often termed proteolysis-targeting chimeras (PROTACs) in the chemical literature, enable the controlled degradation of specific proteins via their direction to the cellular proteasome. In this report, we describe the second phase of our research focused on exploring antibody-drug conjugates (ADCs), which incorporate BRD4-targeting chimeric degrader entities. We employ a new BRD4-binding fragment in the construction of the chimeric ADC payloads that is significantly more potent than the corresponding entity utilized in our initial studies. The resulting BRD4-degrader antibody conjugates exhibit potent and antigen-dependent BRD4 degradation and antiproliferation activities in cell-based experiments. Multiple ADCs bearing chimeric BRD4-degrader payloads also exhibit strong, antigen-dependent antitumor efficacy in mouse xenograft assessments that employ several different tumor models.
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Affiliation(s)
- Peter S Dragovich
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Thomas H Pillow
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Robert A Blake
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jack D Sadowsky
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Emel Adaligil
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Pragya Adhikari
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jinhua Chen
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Nicholas Corr
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | | | | | - Aaron Fullerton
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Steven J Hartman
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Fan Jiang
- Viva Biotech, Structural Biology, 334 Aidisheng Road, Zhangjiang High-Tech Park, Shanghai 201203, China
| | - Susan Kaufman
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Tracy Kleinheinz
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Katherine R Kozak
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Liling Liu
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Ying Lu
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Melinda M Mulvihill
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jeremy M Murray
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Aimee O'Donohue
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Rebecca K Rowntree
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - William S Sawyer
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Leanna R Staben
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - John Wai
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Jian Wang
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - BinQing Wei
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Wentao Wei
- Viva Biotech, Structural Biology, 334 Aidisheng Road, Zhangjiang High-Tech Park, Shanghai 201203, China
| | - Zijin Xu
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Hui Yao
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Shang-Fan Yu
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Donglu Zhang
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Hongyan Zhang
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Shenhua Zhang
- Viva Biotech, Structural Biology, 334 Aidisheng Road, Zhangjiang High-Tech Park, Shanghai 201203, China
| | - Yongxin Zhao
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Hao Zhou
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Xiaoyu Zhu
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
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3
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Dragovich PS, Pillow TH, Blake RA, Sadowsky JD, Adaligil E, Adhikari P, Bhakta S, Blaquiere N, Chen J, Dela Cruz-Chuh J, Gascoigne KE, Hartman SJ, He M, Kaufman S, Kleinheinz T, Kozak KR, Liu L, Liu L, Liu Q, Lu Y, Meng F, Mulvihill MM, O'Donohue A, Rowntree RK, Staben LR, Staben ST, Wai J, Wang J, Wei B, Wilson C, Xin J, Xu Z, Yao H, Zhang D, Zhang H, Zhou H, Zhu X. Antibody-Mediated Delivery of Chimeric BRD4 Degraders. Part 1: Exploration of Antibody Linker, Payload Loading, and Payload Molecular Properties. J Med Chem 2021; 64:2534-2575. [PMID: 33596065 DOI: 10.1021/acs.jmedchem.0c01845] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The biological and medicinal impacts of proteolysis-targeting chimeras (PROTACs) and related chimeric molecules that effect intracellular degradation of target proteins via ubiquitin ligase-mediated ubiquitination continue to grow. However, these chimeric entities are relatively large compounds that often possess molecular characteristics, which may compromise oral bioavailability, solubility, and/or in vivo pharmacokinetic properties. We therefore explored the conjugation of such molecules to monoclonal antibodies using technologies originally developed for cytotoxic payloads so as to provide alternate delivery options for these novel agents. In this report, we describe the first phase of our systematic development of antibody-drug conjugates (ADCs) derived from bromodomain-containing protein 4 (BRD4)-targeting chimeric degrader entities. We demonstrate the antigen-dependent delivery of the degrader payloads to PC3-S1 prostate cancer cells along with related impacts on MYC transcription and intracellular BRD4 levels. These experiments culminate with the identification of one degrader conjugate, which exhibits antigen-dependent antiproliferation effects in LNCaP prostate cancer cells.
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Affiliation(s)
- Peter S Dragovich
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Thomas H Pillow
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Robert A Blake
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jack D Sadowsky
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Emel Adaligil
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Pragya Adhikari
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Sunil Bhakta
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Nicole Blaquiere
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jinhua Chen
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | | | - Karen E Gascoigne
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Steven J Hartman
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Mingtao He
- Pharmaron Beijing, Co. Ltd., 6 Tai He Road, BDA, Beijing 100176, China
| | - Susan Kaufman
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Tracy Kleinheinz
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Katherine R Kozak
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Liang Liu
- Pharmaron Beijing, Co. Ltd., 6 Tai He Road, BDA, Beijing 100176, China
| | - Liling Liu
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Qi Liu
- Pharmaron Beijing, Co. Ltd., 6 Tai He Road, BDA, Beijing 100176, China
| | - Ying Lu
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Fanwei Meng
- Pharmaron Beijing, Co. Ltd., 6 Tai He Road, BDA, Beijing 100176, China
| | - Melinda M Mulvihill
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Aimee O'Donohue
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Rebecca K Rowntree
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Leanna R Staben
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Steven T Staben
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - John Wai
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Jian Wang
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - BinQing Wei
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Catherine Wilson
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jianfeng Xin
- Pharmaron Beijing, Co. Ltd., 6 Tai He Road, BDA, Beijing 100176, China
| | - Zijin Xu
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Hui Yao
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Donglu Zhang
- Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Hongyan Zhang
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Hao Zhou
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
| | - Xiaoyu Zhu
- WuXi AppTec, 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China
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4
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Dragovich PS, Adhikari P, Blake RA, Blaquiere N, Chen J, Cheng YX, den Besten W, Han J, Hartman SJ, He J, He M, Rei Ingalla E, Kamath AV, Kleinheinz T, Lai T, Leipold DD, Li CS, Liu Q, Lu J, Lu Y, Meng F, Meng L, Ng C, Peng K, Lewis Phillips G, Pillow TH, Rowntree RK, Sadowsky JD, Sampath D, Staben L, Staben ST, Wai J, Wan K, Wang X, Wei B, Wertz IE, Xin J, Xu K, Yao H, Zang R, Zhang D, Zhou H, Zhao Y. Antibody-mediated delivery of chimeric protein degraders which target estrogen receptor alpha (ERα). Bioorg Med Chem Lett 2019; 30:126907. [PMID: 31902710 DOI: 10.1016/j.bmcl.2019.126907] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [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: 10/29/2019] [Revised: 12/09/2019] [Accepted: 12/10/2019] [Indexed: 12/31/2022]
Abstract
Chimeric molecules which effect intracellular degradation of target proteins via E3 ligase-mediated ubiquitination (e.g., PROTACs) are currently of high interest in medicinal chemistry. However, these entities are relatively large compounds that often possess molecular characteristics which may compromise oral bioavailability, solubility, and/or in vivo pharmacokinetic properties. Accordingly, we explored whether conjugation of chimeric degraders to monoclonal antibodies using technologies originally developed for cytotoxic payloads might provide alternate delivery options for these novel agents. In this report we describe the construction of several degrader-antibody conjugates comprised of two distinct ERα-targeting degrader entities and three independent ADC linker modalities. We subsequently demonstrate the antigen-dependent delivery to MCF7-neo/HER2 cells of the degrader payloads that are incorporated into these conjugates. We also provide evidence for efficient intracellular degrader release from one of the employed linkers. In addition, preliminary data are described which suggest that reasonably favorable in vivo stability properties are associated with the linkers utilized to construct the degrader conjugates.
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Affiliation(s)
| | - Pragya Adhikari
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Robert A Blake
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | | | - Jinhua Chen
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Yun-Xing Cheng
- Pharmaron Beijing, Co. Ltd., BDA Beijing, 6 Tai He Road, 100176, China
| | | | - Jinping Han
- Pharmaron Beijing, Co. Ltd., BDA Beijing, 6 Tai He Road, 100176, China
| | | | - Jintang He
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Mingtao He
- Pharmaron Beijing, Co. Ltd., BDA Beijing, 6 Tai He Road, 100176, China
| | | | - Amrita V Kamath
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | | | - Tommy Lai
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | | | - Chun Sing Li
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Qi Liu
- Pharmaron Beijing, Co. Ltd., BDA Beijing, 6 Tai He Road, 100176, China
| | - Jiawei Lu
- WuXi Biologics, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Ying Lu
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Fanwei Meng
- Pharmaron Beijing, Co. Ltd., BDA Beijing, 6 Tai He Road, 100176, China
| | - Lingyao Meng
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Carl Ng
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Kaishan Peng
- WuXi Biologics, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | | | - Thomas H Pillow
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | | | - Jack D Sadowsky
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Deepak Sampath
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Leanna Staben
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Steven T Staben
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - John Wai
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Kunpeng Wan
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Xinxin Wang
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - BinQing Wei
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Ingrid E Wertz
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Jianfeng Xin
- Pharmaron Beijing, Co. Ltd., BDA Beijing, 6 Tai He Road, 100176, China
| | - Keyang Xu
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Hui Yao
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Richard Zang
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Donglu Zhang
- Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA
| | - Hao Zhou
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
| | - Yongxin Zhao
- WuXi AppTec, Waigaoqiao Free Trade Zone, 288 Fute Zhong Road, Shanghai 200131, China
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5
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Labadie SS, Li J, Blake RA, Chang JH, Goodacre S, Hartman SJ, Liang W, Kiefer JR, Kleinheinz T, Lai T, Liao J, Ortwine DF, Mody V, Ray NC, Roussel F, Vinogradova M, Yeap SK, Zhang B, Zheng X, Zbieg JR, Liang J, Wang X. Discovery of a C-8 hydroxychromene as a potent degrader of estrogen receptor alpha with improved rat oral exposure over GDC-0927. Bioorg Med Chem Lett 2019; 29:2090-2093. [PMID: 31311734 DOI: 10.1016/j.bmcl.2019.07.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 07/02/2019] [Accepted: 07/05/2019] [Indexed: 11/26/2022]
Abstract
Phenolic groups are responsible for the high clearance and low oral bioavailability of the estrogen receptor alpha (ERα) clinical candidate GDC-0927. An exhaustive search for a backup molecule with improved pharmacokinetic (PK) properties identified several metabolically stable analogs, although in general at the expense of the desired potency and degradation efficiency. C-8 hydroxychromene 30 is the first example of a phenol-containing chromene that not only maintained excellent potency but also exhibited 10-fold higher oral exposure in rats. The improved in vivo clearance in rat was hypothesized to be the result of C-8 hydroxy group being sterically protected from glucuronide conjugation. The excellent potency underscores the possibility of replacing the presumed indispensable phenolic group at C-6 or C-7 of the chromene core. Co-crystal structures were obtained to highlight the change in key interactions and rationalize the retained potency.
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Affiliation(s)
| | - Jun Li
- Genentech Inc., South San Francisco, CA 94080, USA
| | | | - Jae H Chang
- Genentech Inc., South San Francisco, CA 94080, USA
| | - Simon Goodacre
- Charles River Laboratories, 7-9 Spire Green Centre, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | | | | | | | | | - Tommy Lai
- WuXi AppTec Co., Ltd., Shanghai 200131, China
| | | | | | - Vidhi Mody
- Genentech Inc., South San Francisco, CA 94080, USA
| | - Nicholas C Ray
- Charles River Laboratories, 7-9 Spire Green Centre, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Fabien Roussel
- Charles River Laboratories, 7-9 Spire Green Centre, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | | | - Siew Kuen Yeap
- Charles River Laboratories, 7-9 Spire Green Centre, Flex Meadow, Harlow, Essex CM19 5TR, United Kingdom
| | - Birong Zhang
- Genentech Inc., South San Francisco, CA 94080, USA
| | | | | | - Jun Liang
- Genentech Inc., South San Francisco, CA 94080, USA
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Simmons DM, Tse TE, Dailey K, Hartman SJ, Bagsby S, Pitts TM, Tentler JJ, Diamond JR. Abstract P2-06-15: Rational combination of Wee1 and BCL-2 inhibition in preclinical models of triple-negative breast cancer. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p2-06-15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background:
Triple-negative breast cancer (TNBC) is an aggressive subtype distinguished by its lack of expression of receptors for estrogen, progesterone, and normal human epidermal growth factor 2 expression. TNBC is difficult to treat and is associated with a high risk of recurrence and mortality. In order to effectively treat TNBC, alternative therapeutic targets need to be identified. Wee1 is a tyrosine kinase that phosphorylates CDC2 to pause the cell cycle at the G2 checkpoint as a means to delay mitosis while DNA damage undergoes repair. Inactivation of Wee1 via adavosertib (AZD1775, MK1775), a highly selective inhibitor of Wee1, allows CDC25 to dephosphorylate the CDC2/cyclin B complex resulting in premature initiation of mitosis and, ultimately, mitotic catastrophe and apoptosis. An unbiased screen of adovosertib in combination with other targeted compounds in TNBC patient-derived xenograft (PDX) models demonstrated that the combination of adavosertib and navitoclax, an inhibitor of anti-apoptotic BCL-2 and BCL-XL proteins, had greater efficacy than the single agents alone. The purpose of this study was to investigate the combination of adavosertib and navitoclax in preclinical TNBC models, both in vitro and in vivo.
Methods:
HCC1937, CAL51, MDA-MB-231 and MDA-MB-468 cells were plated in 96-well plates and exposed to increasing concentrations of adavosertib (125nM – 1000nM), navitoclax (2500nM – 10000nM), or the combination. Cellular proliferation was assessed in real-time using IncuCyte Live Cell Analysis, followed by endpoint sulforhodamine B (SRB) assay. Combination effects were analyzed using Calcusyn to determine combination indexes (CI). Apoptosis was assessed via the Caspase 3/7 assay. Western blotting was used to assess changes in expression of CDC2, phospho-CDC2, and BCL2. TNBC PDX models CU_TNBC_013 and CU_TNBC_014 were treated with vehicle, adavosertib (50mg/kg), navitoclax (100mg/kg), or the combination and assessed for tumor growth inhibition.
Results:
The combination of adavosertib and navitoclax resulted in greater antiproliferative effects in vitro compared to either single agent (p< 0.05). This effect was classified as synergistic with CI values <1. We observed a significant increase in apoptosis with the combination treatment as measured by Caspase 3/7 (p <0.005). The combination of adavosertib and navitoclax treatment resulted in a decrease in phospo-CDC2, and BCL2 in cell lines. In vivo, the combination treatment resulted in greater tumor growth inhibition as compared to adavosertib or navitoclax alone in the CU_TNBC_013 and CU_TNBC_014 PDX models.
Conclusions:
The combination of adavosertib and navitoclax is active in preclinical TNBC models and induces apoptosis and tumor growth inhibition. This data supports the continued development of this combination in TNBC with investigation of potential selective markers.
Citation Format: Simmons DM, Tse TE, Dailey K, Hartman SJ, Bagsby S, Pitts TM, Tentler JJ, Diamond JR. Rational combination of Wee1 and BCL-2 inhibition in preclinical models of triple-negative breast cancer [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P2-06-15.
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Affiliation(s)
- DM Simmons
- University of Colorado Cancer Center, Aurora, CO
| | - TE Tse
- University of Colorado Cancer Center, Aurora, CO
| | - K Dailey
- University of Colorado Cancer Center, Aurora, CO
| | - SJ Hartman
- University of Colorado Cancer Center, Aurora, CO
| | - S Bagsby
- University of Colorado Cancer Center, Aurora, CO
| | - TM Pitts
- University of Colorado Cancer Center, Aurora, CO
| | - JJ Tentler
- University of Colorado Cancer Center, Aurora, CO
| | - JR Diamond
- University of Colorado Cancer Center, Aurora, CO
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Hartman SJ, Genther-Schroeder ON, Hansen SL. Effect of trace mineral source on mineral status and performance of beef steers fed low- or high-sulfur diets. J Anim Sci 2018; 95:4139-4149. [PMID: 28991996 DOI: 10.2527/jas.2017.1722] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A 2 × 2 factorial assessed the effect of trace mineral (TM) sources fed within low- or high-S diets on the mineral status and performance of cattle. Angus crossbred steers ( = 48; 6/pen) were blocked by BW (316 ± 16.6 kg), assigned to low-S (0.27%; LS) or high-S (0.54%; HS; added as CaSO) diets, and supplemented TM at 10 mg Cu, 30 mg Zn, and 20 mg Mn/kg DM from hydroxy (HYD; IntelliBond; Micronutrients USA LLC, Indianapolis, IN) or inorganic (sulfates; ING) sources ( = 12 steers/treatment). Steers were fed corn silage and corn-based diets via GrowSafe bunks in the growing period (GP; 84 d) and finishing period (FP; 77 d), respectively. Plasma and liver were collected at trial initiation and end of GP and FP for mineral concentrations. End of GP and FP red blood cell lysate superoxide dismutase (SOD) and Mn-SOD activity and liver glutathione concentrations were measured. Data were used as a 2 × 2 factorial using Proc Mixed of SAS (SAS Inst. Inc., Cary, NC) with initial plasma and liver status analyzed as covariates. High S decreased ( < 0.01) liver Cu and tended ( ≤ 0.10) to decrease plasma Cu concentrations. Liver Cu concentrations were lower in HYD than ING in the FP ( < 0.01). High S decreased ( = 0.04) GP plasma Zn concentrations and tended to decrease ( = 0.10) GP liver Zn. There were GP ( = 0.05) and FP ( = 0.02) S × TM effects for liver Mn concentrations where GP LS-HYD was greater than all other treatments, whereas FP LS-HYD was lower than HS-HYD and LS-ING and FP HS-ING was less than LS-ING. Glutathione, SOD, and Mn-SOD were not different ( ≥ 0.13) in the GP, but S × TM tended to affect FP Mn-SOD ( = 0.10), where LS-HYD tended to be lower than LS-ING. Oxidized glutathione in FP tended to be lower ( = 0.06) for HYD than ING. In the GP, there were S × TM effects on performance where LS-HYD had greater ADG and G:F ( ≤ 0.05) than HS-HYD, whereas LS and HS-ING were intermediate. For FP performance S × TM effects were noted where LS-HYD and HS-ING tended ( = 0.10) to gain more than HS-HYD and HS-HYD had lower G:F ( = 0.04) than HS-ING. There were no effects of S × TM on final BW, DMI, or ADG ( ≥ 0.11); however, HS-HYD had lower G:F than other treatments overall ( = 0.05). High S decreased back fat and yield grade ( = 0.03), and rib eye area was smaller for HYD than ING ( = 0.02). In this study HS decreased markers of Cu and Zn status, and differential effects of HYD vs. ING minerals were noted across dietary phases, although all steers maintained adequate TM status.
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Dragovich PS, Blake RA, Chen C, Chen J, Chuh J, den Besten W, Fan F, Fourie A, Hartman SJ, He C, He J, Ingalla ER, Kozak KR, Leong SR, Lu J, Ma Y, Meng L, Nannini M, Oeh J, Ohri R, Lewis Phillips G, Pillow TH, Rowntree RK, Sampath D, Vandlen R, Vollmar B, Wai J, Wertz IE, Xu K, Xu Z, Zhang D. Conjugation of Indoles to Antibodies through a Novel Self-Immolating Linker. Chemistry 2018; 24:4830-4834. [DOI: 10.1002/chem.201800859] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Indexed: 01/05/2023]
Affiliation(s)
| | | | - Chunjiao Chen
- WuXi Biologics; 288 Fute Zhong Road, Waigaoqiao Free Trade Zone Shanghai 200131 P. R. China
| | - Jinhua Chen
- WuXi Apptec; 288 Fute Zhong Road, Waigaoqiao Free Trade Zone Shanghai 200131 P. R. China
| | - Josefa Chuh
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | | | - Fang Fan
- WuXi Apptec; 288 Fute Zhong Road, Waigaoqiao Free Trade Zone Shanghai 200131 P. R. China
| | - Aimee Fourie
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | | | - Changrong He
- WuXi Apptec; 288 Fute Zhong Road, Waigaoqiao Free Trade Zone Shanghai 200131 P. R. China
| | - Jintang He
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | | | | | | | - Jiawei Lu
- WuXi Biologics; 288 Fute Zhong Road, Waigaoqiao Free Trade Zone Shanghai 200131 P. R. China
| | - Yong Ma
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | - Lingyao Meng
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | | | - Jason Oeh
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | - Rachana Ohri
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | | | | | | | - Deepak Sampath
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | | | | | - John Wai
- WuXi Apptec; 288 Fute Zhong Road, Waigaoqiao Free Trade Zone Shanghai 200131 P. R. China
| | | | - Keyang Xu
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
| | - Zijin Xu
- WuXi Apptec; 288 Fute Zhong Road, Waigaoqiao Free Trade Zone Shanghai 200131 P. R. China
| | - Donglu Zhang
- Genentech Inc.; 1 DNA Way South San Francisco CA 94080 USA
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Blake RA, Hartman SJ, Kleinheinz TL, White J, Daly S, Goodwin R, Zhou W, Liang J, Wang X, O'Rourke M, Metcalfe C, Friedman L. Abstract P4-04-07: Characterization of the effects of estrogen receptor alpha Y537S and D538G mutations on receptor function and pharmacology. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-p4-04-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The frontline therapy for estrogen receptor alpha (ERα) positive Breast Cancer (ER+BC) involves various forms of endocrine therapy, consisting of either Selective Estrogen Receptor Modulators (SERMs) or aromatase inhibitors. An emerging mechanism of ER+BC resistance to endocrine therapy, and consequently disease relapse, has been associated with a set of “hotspot” mutations in and near to helix-12 of the ERα ligand binding domain. Selective Estrogen Receptor Degraders/Down-regulators (SERDs), such as GDC-0810, AZD9496 and GDC-0927, represent a current major pharmacological strategy being applied to develop treatments for such resistant ER+BC. Here, we compare 2 of the most frequent ERα hotspot mutations (Y537S and D538G), with ERα wildtype (WT) and the ability of a set of ERα ligands (including GDC-0810, AZD9496 and GDC-0927) to bind, antagonize and degrade ERα. The concentration of each drug required to bind, antagonize or degrade ERα Y537S or ERα D538G was typically higher than that required for ERα WT. Importantly, ERα Y537S is resistant to estradiol stimulated protein degradation and 4-hydroxy-tamoxifen (a major active metabolite of tamoxifen) stabilizes ERα Y537S protein. This represents a potential mechanism of resistance of ERα Y537S ER+BC to Tamoxifen therapy.
Citation Format: Blake RA, Hartman SJ, Kleinheinz TL, White J, Daly S, Goodwin R, Zhou W, Liang J, Wang X, O'Rourke M, Metcalfe C, Friedman L. Characterization of the effects of estrogen receptor alpha Y537S and D538G mutations on receptor function and pharmacology [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P4-04-07.
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Affiliation(s)
- RA Blake
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - SJ Hartman
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - TL Kleinheinz
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - J White
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - S Daly
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - R Goodwin
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - W Zhou
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - J Liang
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - X Wang
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - M O'Rourke
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - C Metcalfe
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
| | - L Friedman
- Genentech, South San Francisco, CA; Charles River Laboratories, Harlow, United Kingdom
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10
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Hartman SJ, Kleinheinz T, White J, Daly S, Goodwin R, Zhou W, Liang J, Wang X, Ortwine DF, Friedman L, O’Rourke M, Metcalfe C, Blake RA. Abstract 3621: Characterization of the effects of estrogen receptor alpha Y537S and D538G mutations on receptor pharmacology. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-3621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The frontline therapy for estrogen receptor alpha (ERα) positive Breast Cancer (ER+BC) involves various forms of endocrine therapy, consisting of either Selective Estrogen Receptor Modulators (SERMs) or aromatase inhibitors. An emerging mechanism of ER+BC resistance to endocrine therapy, and consequently disease relapse, has been associated with a set of “hotspot” mutations in and near to helix-12 of the ERα ligand binding domain. Selective Estrogen Receptor Degraders/Down-regulators (SERDs) represent an important pharmacological strategy being applied to develop treatments for resistant ER+BC. Here, we compare 2 of the most frequent ERα hotspot mutations (Y537S and D538G), with ERα wildtype (WT) and the ability of a set of SERM/SERDs and other ERα ligands to bind, antagonize, degrade/stabilize ERα and affect cell proliferation. Common themes that emerged included the observation that the concentration of each drug required to bind, antagonize or degrade ERα Y537S or ERα D538G was typically higher than that required for ERα WT, although the extent of the shift varied between drugs and the type of measurement. An unexpected observation was that 4-hydroxy-tamoxifen (a major active metabolite of tamoxifen) stabilized nuclear ERα Y537S protein. This represents a potential mechanism that may limit the efficacy of Tamoxifen in treating ERα Y537S ER+BC.
Citation Format: Steven J. Hartman, Tracy Kleinheinz, Jonathan White, Stephen Daly, Ria Goodwin, Wei Zhou, Jun Liang, Xiaojing Wang, Daniel F. Ortwine, Lori Friedman, Martin O’Rourke, Ciara Metcalfe, Robert A. Blake. Characterization of the effects of estrogen receptor alpha Y537S and D538G mutations on receptor pharmacology [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 3621. doi:10.1158/1538-7445.AM2017-3621
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Affiliation(s)
| | | | | | - Stephen Daly
- 2Charles River Laboratories, Harlow, United Kingdom
| | - Ria Goodwin
- 2Charles River Laboratories, Harlow, United Kingdom
| | - Wei Zhou
- 1Genentech, Inc., South San Francisco, CA
| | - Jun Liang
- 1Genentech, Inc., South San Francisco, CA
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11
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Driggers CM, Hartman SJ, Karplus PA. Structures of Arg- and Gln-type bacterial cysteine dioxygenase homologs. Protein Sci 2014; 24:154-61. [PMID: 25307852 DOI: 10.1002/pro.2587] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 10/07/2014] [Accepted: 10/09/2014] [Indexed: 11/12/2022]
Abstract
In some bacteria, cysteine is converted to cysteine sulfinic acid by cysteine dioxygenases (CDO) that are only ∼15-30% identical in sequence to mammalian CDOs. Among bacterial proteins having this range of sequence similarity to mammalian CDO are some that conserve an active site Arg residue ("Arg-type" enzymes) and some having a Gln substituted for this Arg ("Gln-type" enzymes). Here, we describe a structure from each of these enzyme types by analyzing structures originally solved by structural genomics groups but not published: a Bacillus subtilis "Arg-type" enzyme that has cysteine dioxygenase activity (BsCDO), and a Ralstonia eutropha "Gln-type" CDO homolog of uncharacterized activity (ReCDOhom). The BsCDO active site is well conserved with mammalian CDO, and a cysteine complex captured in the active site confirms that the cysteine binding mode is also similar. The ReCDOhom structure reveals a new active site Arg residue that is hydrogen bonding to an iron-bound diatomic molecule we have interpreted as dioxygen. Notably, the Arg position is not compatible with the mode of Cys binding seen in both rat CDO and BsCDO. As sequence alignments show that this newly discovered active site Arg is well conserved among "Gln-type" CDO enzymes, we conclude that the "Gln-type" CDO homologs are not authentic CDOs but will have substrate specificity more similar to 3-mercaptopropionate dioxygenases.
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Affiliation(s)
- Camden M Driggers
- Department of Biochemistry and Biophysics, 2011 Ag & Life Sciences Bldg, Oregon State University, Corvallis, Oregon, 97331
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12
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Hartman SJ, Menon I, Haug-Collet K, Colley NJ. Expression of rhodopsin and arrestin during the light-dark cycle in Drosophila. Mol Vis 2001; 7:95-100. [PMID: 11320353] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
PURPOSE To determine the protein and transcript levels for rhodopsin (Rh1), arrestin 1 (Arr1), and arrestin 2 (Arr2) over a 12 h light/12 h dark cycle in the retina of the fruit fly, Drosophila melanogaster. This information is important for understanding the process of photoreceptor membrane turnover. METHODS Drosophila were entrained for several generations to a daily 12 h light/12 h dark cycle. They were sacrificed at 4 h intervals, beginning at the time of onset of the light phase. Proteins were resolved by polyacrylamide gel electrophoresis (PAGE) and subjected to immunoblot analysis using antibodies directed to rhodopsin, NinaA, Arr1, and Arr2. Northern blots were incubated with riboprobes corresponding to the rhodopsin gene (ninaE), arrestin1 (arr1), and arrestin2 (arr2). RESULTS In entrained Drosophila, protein and mRNA levels for rhodopsin, arrestin1, and arrestin2 were constant during a 12 h light/12 h dark cycle. CONCLUSIONS These results indicate that rhodopsin and arrestin protein synthesis in Drosophila photoreceptors do not fluctuate on a daily cycle. These findings are similar to those obtained in Xenopus laevis, but in contrast to a variety of other vertebrate and invertebrate species.
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Affiliation(s)
- S J Hartman
- Department of Ophthalmology & Visual Science, University of Wisconsin, Madison, WI 53706, USA
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13
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Hartman SJ. Battered woman in a small town. Encountering violence through the story of one woman. AWHONN Lifelines 2000; 4:35-9. [PMID: 11898284 DOI: 10.1111/j.1552-6356.2000.tb01191.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Crow SM, Hartman SJ. Improving the political skills of health care supervisors. Health Care Superv 1996; 14:35-41. [PMID: 10157006] [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] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
The health care industry in the United States has been in a state of social, economic, and political flux for several years. This transition has put a great deal of pressure on supervisors, managers, and professionals in the health care field to adapt by acquiring new skills. Much of the emphasis has been on improving technical, managerial, and people know-how. An equally important area of expertise--political skills--has been virtually ignored. This may be due to the negative connotations associated with politics. Ways to enhance political skills are examined.
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Affiliation(s)
- S M Crow
- Department of Management, University of New Orleans, LA, USA
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