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Cellular Signaling Pathway Research (Learn More about Signaling Pathways)
Upon stimulation by growth factors, cytokines or drugs, cells trigger rapid signaling responses through receptor activation and downstream protein phosphorylation. Changes in phosphorylation levels at specific sites of receptors and signaling proteins serve as critical readouts for evaluating activation, inhibition and drug responses of cellular signaling pathways.
KeyTec® TR-FRET offers protein and phosphoprotein detection products for cellular signaling research, enabling quantitative analysis of target proteins and site-specific phosphorylation levels in cell lysate samples. Current portfolio covers Total STAT6, Phospho-EGFR (Y1068), Phospho-INSR β (Y1150/Y1151), Phospho-AKT (S473) and Phospho-ERK1/2 (T202/Y204). These targets span receptor tyrosine kinases and canonical signaling cascades including PI3K/AKT and RAS/RAF/MEK/ERK, delivering detection tools for cellular signaling research and evaluation of drug effects.
1 TR-FRET Detection of Cellular Signaling Responses
After cells receive defined stimulation, protein samples are obtained by cell lysis and analyzed with TR-FRET assay systems targeting the protein of interest or phosphorylation sites. For phosphorylation detection, TR-FRET recognizes specific phosphosites on target proteins to quantify shifts in phosphorylation levels before and after stimulation or across different treatment conditions, thereby reflecting the activation status of relevant signaling pathways.
Compared with observing cellular phenotypes alone, direct detection of signaling proteins and their phosphorylation status enables further analysis of stimulus‑ or drug‑induced signaling changes at the molecular level, providing evidence for pathway mechanism research and pharmacodynamic evaluation.
2 Coverage of Canonical Cellular Signaling Pathway Targets
KeyTec® TR-FRET cellular signaling assay products cover multiple representative signaling proteins and phosphosites. Appropriate detection products can be selected according to different research objectives.
- EGFR Signaling Research
Phospho-EGFR (Y1068) detects site-specific phosphorylation changes associated with EGFR activation, suitable for growth factor stimulation assays, EGFR signaling research and functional evaluation of EGFR-targeted therapeutics.
- INSR–AKT Signaling Research
Phospho-INSR β (Y1150/Y1151) enables analysis of the phosphorylation status of the insulin receptor β subunit. Phospho-AKT (S473) measures AKT activation levels. Combined with various stimulation or drug treatment conditions, these reagents support analysis of INSR/PI3K/AKT signaling responses.
- ERK Signaling Research
Phospho-ERK1/2 (T202/Y204) detects phosphorylation levels linked to ERK1/2 activation, applicable to MAPK/ERK pathway research and functional assessment of related inhibitors.
- STAT6 Signaling Research
Total STAT6 measures total STAT6 protein abundance in cell lysate samples. It can be combined with cellular stimulation, signaling modulation and drug treatment experiments for relevant signaling studies.
3 From Cellular Stimulation to Pathway Response Analysis
For cellular signaling research, different stimulation or drug treatment conditions are typically configured according to experimental goals. For example, after treatment with growth factors, cytokines or candidate compounds, cells are lysed, and appropriate KeyTec® TR-FRET assay products are selected to quantify target protein or phosphoprotein levels.
By comparing assay signals across different treatment conditions, researchers can evaluate:
- Whether the signaling pathway is activated: compare changes in target phosphorylation levels before and after stimulation;
- Whether the signaling pathway is inhibited: compare phosphorylation responses with and without drug treatment;
- Drug potency: test a range of drug concentrations to analyze the correlation between signaling shifts and drug concentration;
- Cellular pharmacodynamic responses: assess the modulatory effects of candidate drugs on cellular signaling networks by measuring key pathway nodes.
Therefore, TR-FRET assays can be used not only for analysis of a single protein or phosphosite, but also serve as pathway response detection tools for investigating drug effects at the cellular level.
4 Supporting Cellular Signaling Pathway and Drug Research
Based on detection of diverse signaling proteins and phosphosites, KeyTec® TR-FRET products are applicable to growth factor signaling research, receptor activation analysis, cellular signaling pathway investigation, pathway inhibitor screening, drug response assessment and cellular pharmacodynamic studies.
For candidate drug research, matching phospho-detection products can be selected according to the drug target. Cellular signaling response curves can be generated across multiple treatment concentrations to evaluate the modulatory effects of drugs on specific signaling nodes at the molecular level.
5 KeyTec® Cell Signaling Assay Product Portfolio
Product | Main Application | |
Total Protein | Total STAT6 | Detection of total STAT6 protein level |
Phosphorylation | Phospho-EGFR (Y1068) | Detection of EGFR activation and phosphorylation |
Phosphorylation | Phospho-INSR β (Y1150/Y1151) | Detection of INSR β phosphorylation |
Phosphorylation | Phospho-AKT (S473) | Detection of AKT activation and phosphorylation |
Phosphorylation | Phospho-ERK1/2 (T202/Y204) | Detection of ERK1/2 activation and phosphorylation |
6 Advantages of KeyTec® TR-FRET Cell Signaling Assay Products
- Multi-Target Coverage: Covers representative targets in cellular signaling research including STAT6, EGFR, INSR, AKT and ERK1/2 to meet diverse requirements for signaling pathway studies.
- Site-Specific Phosphorylation Detection: Detects key phosphosites on EGFR, INSR β, AKT and ERK1/2 to directly analyze cellular signaling activation status.
- Compatible with Cell Lysate Analysis: Enables combination of cellular stimulation, drug treatment and protein detection, establishing experimental workflows from cell treatment to signaling response evaluation.
- Drug Discovery Applications: Suitable for pathway inhibitor screening, drug response assessment and cellular pharmacodynamic studies, providing detection evidence for mechanism-of-action analysis of candidate compounds.
Targeting cellular signaling proteins and key phosphosites, KeyTec® TR-FRET Cell Signaling Assay integrates cellular stimulation, signaling response and quantitative TR-FRET measurement, delivering convenient assay products and solutions for cellular signaling pathway research, drug screening and cellular pharmacodynamic evaluation.
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