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Updated: May 7, 2026
High-throughput Screening for Chemical Modulators of Post-transcriptionally Regulated Genes
Published on: March 3, 2015
Screening approaches to generating STAT inhibitors: Allowing the hits to identify the targets
Sarah R Walker1, David A Frank
1Department of Medical Oncology; Dana-Farber Cancer Institute; and Department of Medicine; Brigham and Women's Hospital and Harvard Medical School; Boston, MA USA.
Abstract:
STAT transcription factors are regulators of critical cellular processes such as proliferation, survival, and self-renewal. While the activity of these proteins is tightly regulated under physiological conditions, they can become constitutively activated in a broad range of human cancers. This inappropriate STAT activation leads to enhanced transcription of genes that can directly lead to the malignant phenotype. Since STATs are largely dispensable for normal cell function, this has raised the possibility that STATs might be key targets for cancer therapy. Although a number of structure-based strategies have been used to develop STAT inhibitors, an alternate approach is to use cell-based assays that make use of the transcriptional function of STATs. Employing these systems, one can screen large chemical libraries to identify compounds that specifically block the function of a given STAT. This approach can lead to the identification of compounds that inhibit STATs by a variety of mechanisms, and can suggest novel targets for therapy. This type of functional screening strategy has already identified a drug that potently inhibits STAT3, and which is now being evaluated in a clinical trial for patients with chronic lymphocytic leukemia.
Insights
Signal transducer and activator of transcription (STAT) proteins regulate cell growth but are often overactive in cancer. Researchers are developing new cancer therapies by screening for compounds that block STAT function.
Area of Science:
- Molecular Biology
- Oncology
Background:
- Signal transducer and activator of transcription (STAT) proteins are crucial for cell proliferation, survival, and self-renewal.
- Constitutive activation of STATs is implicated in the development of various human cancers, promoting malignant phenotypes.
- STATs are largely dispensable for normal cellular functions, making them attractive therapeutic targets for cancer treatment.
Purpose of the Study:
- To explore cell-based assays as a strategy for identifying STAT inhibitors.
- To investigate novel therapeutic approaches targeting STATs in cancer.
Main Methods:
- Utilized cell-based assays that leverage the transcriptional activity of STATs.
- Screened large chemical libraries to identify compounds that inhibit STAT function.
Main Results:
- Identified compounds that inhibit STATs through diverse mechanisms.
- This functional screening approach led to the discovery of a potent STAT3 inhibitor.
Conclusions:
- Cell-based functional screening is a viable strategy for discovering STAT inhibitors.
- A novel STAT3 inhibitor identified through this method is currently in clinical trials for chronic lymphocytic leukemia, demonstrating therapeutic potential.
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