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Updated: Aug 15, 2026
A Multiplexed Luciferase-based Screening Platform for Interrogating Cancer-associated Signal Transduction in Cultured Cells
Published on: July 3, 2013
Mammalian cell lines engineered to identify inhibitors of specific signal transduction pathways
R E Jones1, D Defeo-Jones, E M McAvoy
1Department of Cancer Research, Merck Sharp and Dohme Research Laboratories, West Point, Pennsylvania 19486.
Abstract:
A variety of signal transduction pathways contribute to the regulation of transcription in mammalian cells. Several of these pathways ultimately rely upon the interaction of transcription factors with genetic sequences termed response elements in the promoter regions of some genes. The biochemical mechanisms that control the levels and state of activation of transcription factors are poorly understood. However, specific phosphorylation events mediated by protein kinase C, growth factor receptor-linked tyrosine kinases, and protein kinase A clearly participate in the regulation of these signal transduction pathways. To understand the relationship between activation and/or inhibition of these pathways and regulation of gene expression controlled by specific response elements, cell lines were prepared containing the TPA response element (TRE), serum response element (SRE), or cyclic AMP response element (CRE) fused to a gene encoding a secretable form of alkaline phosphatase (SEAP). These TRE-SEAP, SRE-SEAP, and CRE-SEAP cells exhibit dramatic increases in alkaline phosphatase (AP) activity following exposure to TPA, PDGF, or forskolin. Down regulation of protein kinase C or inhibition of tyrosine kinase activity blocked the stimulation of AP activity caused by TPA or PDGF. These cell lines can be used to characterize existing inhibitors, and to identify new agents that affect specific signal transduction pathways in mammalian cells.
Insights
Researchers developed novel cell lines to study gene transcription regulation. These cells enable the characterization of inhibitors targeting specific signal transduction pathways, advancing our understanding of cellular responses.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Gene Regulation
Background:
- Signal transduction pathways regulate gene transcription in mammalian cells.
- Transcription factors interact with response elements in gene promoter regions.
- Biochemical mechanisms controlling transcription factor activity are not fully understood.
Purpose of the Study:
- To investigate the relationship between signal transduction pathway activation/inhibition and gene expression regulation.
- To develop reporter cell lines for studying specific response elements: TPA response element (TRE), serum response element (SRE), and cyclic AMP response element (CRE).
Main Methods:
- Creation of TRE-SEAP, SRE-SEAP, and CRE-SEAP reporter cell lines.
- Exposure of cell lines to stimuli like TPA, PDGF, and forskolin to measure alkaline phosphatase (AP) activity.
- Assessment of inhibitor effects on AP activity, including protein kinase C downregulation and tyrosine kinase inhibition.
Main Results:
- TRE-SEAP, SRE-SEAP, and CRE-SEAP cells showed significant AP activity increases upon stimulation.
- TPA and PDGF-induced AP activity stimulation was blocked by protein kinase C downregulation or tyrosine kinase inhibition.
- Demonstrated utility of these cell lines for studying signal transduction pathway modulation.
Conclusions:
- The developed reporter cell lines are effective tools for studying signal transduction pathways.
- These cell lines facilitate the characterization of existing inhibitors and the discovery of new agents impacting specific pathways.
- Provides a valuable system for understanding the link between signaling events and gene expression control.
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