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JNK Pathway Activation Modulates Acquired Resistance to EGFR/HER2-Targeted Therapies

Simin Manole1, Edward J Richards1, Aaron S Meyer2

  • 1Koch Institute for Integrative Cancer Research at MIT, Cambridge, Massachusetts.

Cancer Research
|July 25, 2016
PubMed

Insights

Receptor tyrosine kinase (RTK)-targeted therapies face resistance via bypass signaling. This study identifies the JNK pathway as crucial for RTK bypass resistance, enabling better combination therapy selection.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Resistance to receptor tyrosine kinase (RTK)-targeted therapies limits clinical efficacy.
  • Bypass signaling, where untargeted RTKs reactivate survival pathways, is a common resistance mechanism.
  • Understanding the specific downstream signaling events driving bypass resistance is critical for effective combination therapies.

Purpose of the Study:

  • To identify key downstream signaling events responsible for RTK-mediated bypass resistance.
  • To elucidate how different RTKs contribute to therapeutic resistance through distinct downstream pathway activations.
  • To validate the role of specific pathways, such as JNK, in modulating bypass resistance.

Main Methods:

  • A combined experimental and statistical modeling approach was employed.
  • Analysis of downstream signaling events in response to RTK inhibition.
  • Experimental validation of identified resistance pathways.

Main Results:

  • Identified a set of pathway reactivations essential for RTK-mediated bypass resistance.
  • Demonstrated that downstream pathway activation differences qualitatively alter a receptor's capacity to drive resistance.
  • Validated that the JNK pathway is activated during bypass resistance and significantly modulates it.

Conclusions:

  • The JNK pathway plays a critical role in mediating RTK bypass resistance.
  • Findings inform the design of combination therapies to overcome bypass-mediated resistance.
  • Provides insights into network-level kinase dependence changes for prognostic assay development.

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