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Updated: Sep 9, 2025
FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
Published on: August 20, 2012
Real-time visualization of STAT activation in live cells using genetically encoded biosensors
Thi A N Nguyen1,2,3, Roman Meledin1,2,3, Karin J Seubert-Buholzer4
1Center for Human Immunology, University of Zurich, Zurich, Switzerland.
Abstract:
Signal transducer and activator of transcription (STAT) is a family of key transcriptional regulators in immune, epithelial and mesenchymal cells. Aberrant STAT activity is associated with malignancy, autoimmunity and immunodeficiency. The STAT signaling pathways are very attractive drug targets; however, validated tools to monitor real-time activation of STATs are lacking. Here, we developed a class of highly sensitive genetically encoded STAT biosensors, termed STATeLights, which allowed direct and continuous detection of STAT activity in live cells with high spatiotemporal resolution. Using human STAT5A, we demonstrate the versatility of STATeLight5A to quantify the activation of wild-type STAT5 versus disease-associated STAT5 mutants and to precisely select compounds targeting the STAT5 signaling pathway. Moreover, STATeLight5A also facilitated real-time tracking of STAT5 activation in human primary CD4+ T cells. Collectively, our biosensors open up unprecedented possibilities of studying STAT biology and druggability in various cellular contexts.
Insights
Researchers developed STATeLights, novel biosensors for real-time monitoring of Signal transducer and activator of transcription (STAT) activity. These tools enable precise study of STAT biology and drug development for diseases linked to aberrant STAT signaling.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Biotechnology
Background:
- Signal transducer and activator of transcription (STAT) proteins are crucial regulators in various cell types.
- Dysregulated STAT activity is implicated in cancer, autoimmune disorders, and immunodeficiency.
- Current methods for monitoring STAT activation lack real-time, continuous detection capabilities.
Purpose of the Study:
- To develop sensitive, genetically encoded biosensors for real-time STAT activity monitoring.
- To validate the utility of these biosensors in studying STAT biology and drug discovery.
Main Methods:
- Development of STATeLights, a class of genetically encoded biosensors.
- Utilizing STATeLight5A to monitor STAT5 activation in live cells.
- Application in human primary CD4+ T cells.
Main Results:
- STATeLights provide direct, continuous detection of STAT activity with high spatiotemporal resolution.
- STATeLight5A successfully quantified STAT5 activation, differentiating wild-type from mutants.
- The biosensor facilitated compound screening for STAT5 pathway inhibitors.
Conclusions:
- STATeLights represent a versatile tool for studying STAT signaling in real-time.
- These biosensors enhance the understanding of STAT biology and accelerate drug development targeting STAT pathways.
- Opens new avenues for investigating STAT druggability in diverse cellular contexts.
