Cited by 253Protein Degradation and InhibitorsCytokine Signaling Pathways and InteractionsChemical Synthesis and Analysis

Structure-Based Discovery of SD-36 as a Potent, Selective, and Efficacious PROTAC Degrader of STAT3 Protein

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Zhou, Haibin, Bai, Longchuan, Xu, Renqi, Zhao, Yujun, Chen, Jianyong, McEachern, Donna, Chinnaswamy, Krishnapriya, Wen, Bo +11 more·2019·Journal of Medicinal Chemistry

Abstract

Signal transducer and activator of transcription 3 (STAT3) is a transcription factor and an attractive therapeutic target for cancer and other human diseases. Despite 20 years of persistent research efforts, targeting STAT3 has been very challenging. We report herein the structure-based discovery of potent small-molecule STAT3 degraders based upon the proteolysis targeting chimera (PROTAC) concept. We first designed SI-109 as a potent, small-molecule inhibitor of the STAT3 SH2 domain. Employing ligands for cereblon/cullin 4A E3 ligase and SI-109, we obtained a series of potent PROTAC STAT3 degraders, exemplified by SD-36. SD-36 induces rapid STAT3 degradation at low nanomolar concentrations in cells and fails to degrade other STAT proteins. SD-36 achieves nanomolar cell growth inhibitory activity in leukemia and lymphoma cell lines with high levels of phosphorylated STAT3. A single dose of SD-36 results in complete STAT3 protein degradation in xenograft tumor tissue and normal mouse tissues. SD-36 achieves complete and long-lasting tumor regression in the Molm-16 xenograft tumor model at well-tolerated dose-schedules. SD-36 is a potent, selective, and efficacious STAT3 degrader.

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Authors
Zhou, H., Bai, L., Xu, R., Zhao, Y., Chen, J., McEachern, D., Chinnaswamy, K., Wen, B., Dai, L., Kumar, P., Yang, C.-Y., Liu, Z., Wang, M., Liu, L., Meagher, J. L., Yi, H., Sun, D., Stuckey, J. A., & Wang, S.
Affiliations
University of Michigan (US)
Corresponding author
Wang, Shaomeng
Venue
Journal of Medicinal Chemistry
Published
2019-11-20
Volume
62
Issue
24
Pages
11280-11300
ISSN
  • 0022-2623 (ISSN-L)
  • 1520-4804
OpenAlex
W2990256176
Cited by
233
References
40
Citations by year
2026: 26 · 2025: 43 · 2024: 31 · 2023: 33 · 2022: 44 · 2021: 28 · 2020: 27 · 2014: 1
FWCI
8.85
Type
journal article
Language
en
Open access
Locations
  • Journal of Medicinal Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (P30 CA046592)
  • Comprehensive Cancer Center, University of Michigan
  • Oncopia Therapeutics Inc.
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
Keywords
STAT3, PROTACs, small-molecule degraders, SH2 domain inhibitors, structure-based drug design, leukemia, lymphoma, xenograft tumor regression, protein degradation
MeSH terms
Animals, Antineoplastic Agents, Azocines, Female, Humans, Indoles, Protein Conformation, Tissue Distribution, Tumor Cells, Cultured, Drug Design, Molecular Structure, Leukemia, Myeloid, Acute, Mice, SCID, Apoptosis, Xenograft Model Antitumor Assays, Cell Proliferation, STAT3 Transcription Factor, Mice, Drug Discovery, Proteolysis, Organophosphonates

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