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Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence
Published on: January 7, 2019
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Oncogenic EML4-ALK assemblies suppress growth factor perception and modulate drug tolerance
David Gonzalez-Martinez1, Lee Roth1, Thomas R Mumford1
1Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, 19104, USA.
Nature Communications
|November 3, 2024
Summary
Drug resistance in ALK-driven cancers is linked to EML4-ALK protein assemblies. These assemblies suppress receptor tyrosine kinase (RTK) signaling, but ALK inhibition unexpectedly resensitizes RTKs, promoting cell survival via ERK reactivation.
Area of Science:
- Oncology
- Molecular Biology
- Cell Signaling
Background:
- Drug resistance is a major hurdle in treating cancers driven by EML4-ALK fusion oncogenes.
- EML4-ALK forms cytoplasmic protein condensates, but their role in drug response is not fully understood.
Purpose of the Study:
- To investigate the function of EML4-ALK assemblies in targeted therapy response.
- To elucidate the mechanism of drug resistance and identify potential therapeutic strategies.
Main Methods:
- Utilized optogenetics and live-cell imaging to study EML4-ALK assemblies.
- Analyzed the interaction between EML4-ALK, adapter proteins, and receptor tyrosine kinase (RTK) signaling pathways.
Main Results:
- EML4-ALK assemblies suppress RTK signaling by sequestering adapter proteins like GRB2 and SOS1.
- ALK inhibition releases these adapters, resensitizing RTK signaling and leading to pulsatile ERK reactivation.
- Reactivated ERK signaling, driven by paracrine ligands from dying cells, promotes cancer cell survival.
Conclusions:
- EML4-ALK assemblies play a regulatory role in RTK signaling and drug response.
- A novel mechanism of tolerance to targeted therapies involving RTK resensitization and ERK reactivation has been uncovered.
- Combination therapies targeting paracrine signaling alongside ALK inhibition may overcome drug resistance.
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