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Resolving the EGF-EGFR interaction characteristics through a multiple-temperature, multiple-inhibitor, real-time
Hanna Björkelund1, Lars Gedda2, Magnus Malmqvist3
1Biomedical Radiation Sciences, Department of Radiology, Oncology and Radiation Sciences, Rudbeck Laboratory, Uppsala University; ; Ridgeview Instruments AB, Uppsala;
Abstract:
Overexpression and aberrant activity of the epidermal growth factor (EGF) have been observed in various cancer types, rendering it an important target in oncology research. The interaction between EGF and its receptor (EGFR), as well as subsequent internalization, is complex and may be affected by various factors including tyrosine kinase inhibitors (TKIs). By combining real-time binding curves produced in LigandTracer® with internalization assays conducted at different temperatures and with different TKIs, the processes of ligand binding, internalization and excretion was visualized. SKOV3 cells had a slower excretion rate compared to A431 and U343 cells, and the tested TKIs (gefitinib, lapatinib, AG1478 and erlotinib) reduced the degree of internalization. The kinetic analysis of the binding curves further demonstrated TKI-dependent balances of EGFR monomer and dimer populations, where lapatinib promoted the monomeric form, while the other TKIs induced dimers. The dimer levels were found to be associated with the apparent affinity of the EGF-EGFR interaction, with EGF binding stronger to EGFR dimers compared to monomers. This study analyzed how real-time molecular interaction analysis may be utilized in combination with perturbations in order to understand the kinetics of a ligand-receptor interaction, as well as some of its associated intracellular processes. Our multiple-temperature and -inhibitor assay setup renders it possible to follow the EGFR monomer, dimer and internalized populations in a detailed manner, allowing for a new perspective of the EGFR biology.
Insights
This study visualizes epidermal growth factor receptor (EGFR) interactions and internalization using real-time analysis. Tyrosine kinase inhibitors (TKIs) impact EGFR dimerization and reduce internalization, offering new insights into EGFR biology.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Epidermal growth factor (EGF) and its receptor (EGFR) are crucial targets in cancer due to their overexpression and aberrant activity.
- The EGF-EGFR interaction and subsequent cellular internalization are complex processes influenced by various factors, including tyrosine kinase inhibitors (TKIs).
Purpose of the Study:
- To investigate the impact of TKIs on EGF-EGFR binding kinetics and cellular internalization.
- To analyze the dynamic interplay between EGFR monomer/dimer populations and EGF binding affinity.
- To provide a detailed understanding of EGFR biology through real-time molecular interaction analysis.
Main Methods:
- Utilized LigandTracer® for real-time binding curve analysis.
- Conducted internalization assays at multiple temperatures with various TKIs (gefitinib, lapatinib, AG1478, erlotinib).
- Combined kinetic analysis of binding curves with cellular assays to visualize ligand-receptor dynamics.
Main Results:
- SKOV3 cells exhibited slower EGFR excretion rates compared to A431 and U343 cells.
- Tested TKIs significantly reduced EGFR internalization.
- Lapatinib promoted EGFR monomers, while other TKIs induced EGFR dimers, influencing EGF binding affinity.
Conclusions:
- Real-time molecular interaction analysis combined with perturbations offers a powerful approach to study ligand-receptor kinetics and intracellular processes.
- The study provides a detailed perspective on EGFR biology by monitoring monomer, dimer, and internalized populations.
- TKI-dependent modulation of EGFR dimerization impacts EGF binding and cellular responses.
