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Deciphering the Structural Effects of Activating EGFR Somatic Mutations with Molecular Dynamics Simulation
Published on: May 20, 2020
Stress-Induced EGFR Trafficking: Mechanisms, Functions, and Therapeutic Implications
Xiaojun Tan1, Paul F Lambert2, Alan C Rapraeger3
1Program in Molecular and Cellular Pharmacology, University of Wisconsin-Madison School of Medicine and Public Health, 1300 University Avenue, Madison, WI 53706, USA.
Abstract:
Epidermal growth factor receptor (EGFR) has fundamental roles in normal physiology and cancer, making it a rational target for cancer therapy. Surprisingly, however, inhibitors that target canonical, ligand-stimulated EGFR signaling have proven to be largely ineffective in treating many EGFR-dependent cancers. Recent evidence indicates that both intrinsic and therapy-induced cellular stress triggers robust, noncanonical pathways of ligand-independent EGFR trafficking and signaling, which provides cancer cells with a survival advantage and resistance to therapeutics. Here, we review the mechanistic regulation of noncanonical EGFR trafficking and signaling, and the pathological and therapeutic stresses that activate it. We also discuss the implications of this pathway in clinical treatment of EGFR-overexpressing cancers.
Insights
Epidermal growth factor receptor (EGFR) inhibitors often fail because cancer cells use stress-activated, noncanonical pathways for survival. Understanding ligand-independent EGFR signaling is key to overcoming therapeutic resistance in cancer.
Area of Science:
- Oncology
- Molecular Biology
- Cellular Signaling
Background:
- Epidermal growth factor receptor (EGFR) is crucial in normal physiology and cancer.
- Targeting canonical EGFR signaling has limited efficacy in many EGFR-dependent cancers.
- Cellular stress activates noncanonical EGFR pathways, promoting cancer cell survival and therapeutic resistance.
Purpose of the Study:
- To review the regulation of noncanonical EGFR trafficking and signaling.
- To discuss stresses activating these pathways.
- To explore clinical implications for EGFR-overexpressing cancers.
Main Methods:
- Literature review of mechanistic studies on EGFR signaling.
- Analysis of cellular stress-induced pathways.
- Discussion of clinical data and therapeutic strategies.
Main Results:
- Noncanonical EGFR pathways are activated by intrinsic and therapy-induced cellular stress.
- Ligand-independent EGFR signaling confers survival advantages and resistance.
- These pathways represent a critical mechanism of therapeutic failure.
Conclusions:
- Noncanonical EGFR signaling is a significant factor in treatment resistance.
- Targeting these stress-activated pathways may offer new therapeutic avenues.
- Further research is needed to translate these findings into effective clinical treatments.
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