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Schwannoma development is mediated by Hippo pathway dysregulation and modified by RAS/MAPK signaling

Zhiguo Chen1, Stephen Li1,2, Juan Mo1

  • 1Department of Dermatology and.

JCI Insight
|September 22, 2020
PubMed

Insights

Hippo pathway dysregulation in Schwann cells drives schwannoma development. Targeting YAP/TAZ and MAPK signaling offers a synergistic therapeutic approach for these tumors.

Area of Science:

  • Oncology
  • Cell Biology
  • Genetics

Background:

  • Schwannomas are tumors originating from Schwann cells, causing significant pain and organ impairment.
  • While genes like NF2 are implicated, the precise molecular mechanisms of schwannoma development remain unclear.
  • Merlin's role in Hippo, MAPK, and PI3K pathways is known, but its direct impact on schwannoma pathogenesis requires further evidence.

Purpose of the Study:

  • To investigate the role of the Hippo signaling pathway in Schwann cell lineage in schwannoma development.
  • To explore the interplay between Hippo and MAPK signaling in schwannoma formation.
  • To evaluate the therapeutic potential of cotargeting YAP/TAZ and MAPK signaling.

Main Methods:

  • Genetic manipulation of the Hippo pathway in mouse Schwann cell lineage.
  • Analysis of YAP/TAZ and MAPK signaling in schwannoma development.
  • Assessment of combined targeted therapy efficacy in a mouse model.

Main Results:

  • Dysregulation of the Hippo pathway in Schwann cells directly causes multiple schwannoma formation in mice.
  • Canonical Hippo signaling via YAP/TAZ effectors is essential for schwannomagenesis.
  • MAPK signaling influences the rate and extent of schwannoma formation.
  • Combined targeting of YAP/TAZ transcriptional activity and MAPK signaling showed synergistic therapeutic effects.

Conclusions:

  • The Hippo pathway is a critical driver of schwannoma development in the Schwann cell lineage.
  • YAP/TAZ and MAPK signaling pathways are key players in schwannoma pathogenesis.
  • Combinatorial targeted therapy offers a promising strategy for treating schwannomas.
Keywords:
GeneticsOncologySignal transductionTumor suppressors

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