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Updated: May 10, 2026
SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs
Published on: June 28, 2019
A high-content screening assay for small-molecule modulators of oncogene-induced senescence
Benjamin G Bitler1, Lauren S Fink, Zhi Wei
11Gene Expression and Regulation Program, The Wistar Institute, Philadelphia, PA, USA.
Abstract:
Cellular senescence is a state of stable cell growth arrest. Activation of oncogenes such as RAS in mammalian cells typically triggers cellular senescence. Oncogene-induced senescence (OIS) is an important tumor suppression mechanism, and suppression of OIS contributes to cell transformation. Oncogenes trigger senescence through a multitude of incompletely understood downstream signaling events that frequently involve protein kinases. To identify target proteins required for RAS-induced senescence, we developed a small-molecule screen in primary human fibroblasts undergoing senescence induced by oncogenic RAS (H-Ras(G12V)). Using a high-content imaging system to monitor two hallmarks of senescence, senescence-associated β-galactosidase activity expression and inhibition of proliferation, we screened a library of known small-molecule kinase inhibitors for those that suppressed OIS. Identified compounds were subsequently validated and confirmed using a third marker of senescence, senescence-associated heterochromatin foci. In summary, we have established a novel high-content screening platform that may be useful for elucidating signaling pathways mediating OIS by targeting critical pathway components.
Insights
Researchers identified key protein kinases involved in oncogene-induced senescence (OIS) using a novel screening platform. This discovery aids in understanding tumor suppression mechanisms and developing targeted cancer therapies.
Area of Science:
- Cell Biology
- Molecular Biology
- Oncology
Background:
- Cellular senescence is a critical tumor suppression mechanism.
- Oncogene-induced senescence (OIS) prevents cell transformation but its signaling pathways are not fully understood.
- Protein kinases are frequently involved in oncogene-induced signaling.
Purpose of the Study:
- To identify target proteins crucial for RAS-induced senescence.
- To develop and utilize a high-content screening platform for OIS research.
Main Methods:
- A small-molecule kinase inhibitor screen was performed on primary human fibroblasts.
- Senescence was induced by oncogenic RAS (H-Ras(G12V)).
- High-content imaging assessed senescence-associated β-galactosidase activity, proliferation inhibition, and heterochromatin foci.
Main Results:
- A novel high-content screening platform for studying OIS was established.
- Several small-molecule kinase inhibitors that suppress RAS-induced senescence were identified.
- Validated compounds confirmed critical pathway components involved in OIS.
Conclusions:
- The developed screening platform is effective for elucidating OIS signaling pathways.
- Targeting identified protein kinases may offer therapeutic strategies against cancer.
- Further research can leverage this platform to uncover novel OIS regulators.
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