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AMOTL1 Promotes Breast Cancer Progression and Is Antagonized by Merlin.

Christophe Couderc1, Alizée Boin1, Laetitia Fuhrmann2

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The Hippo signaling pathway regulates breast cancer aggressiveness via AMOTL1. Merlin loss and YAP activation increase AMOTL1, promoting tumor cell migration and proliferation, and predicting relapse risk.

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Area of Science:

  • Cell Biology
  • Oncology
  • Molecular Biology

Background:

  • The Hippo signaling pathway is crucial for cell fate regulation.
  • Its role in cancer extends beyond YAP transcriptional activity and MST/LATS kinase regulation.

Purpose of the Study:

  • Investigate the role of AMOTL1 as a Hippo signaling effector in breast cancer.
  • Elucidate the mechanisms linking Hippo signaling, AMOTL1, and tumor aggressiveness.

Main Methods:

  • Investigated canonical and noncanonical Hippo signaling modulation of AMOTL1 levels.
  • Examined Merlin's role in AMOTL1 proteasomal degradation via NEDD ubiquitin ligases.
  • Assessed YAP's effect on AMOTL1 expression.
  • Analyzed AMOTL1 protein levels in human breast tumors and lymph node metastasis.

Main Results:

  • AMOTL1 connects Hippo signaling to breast cancer cell aggressiveness.
  • Merlin directly interacts with AMOTL1, promoting its degradation; YAP stimulates AMOTL1 expression.
  • Loss of Merlin and YAP activation lead to elevated AMOTL1 levels in breast cancers.
  • AMOTL1 expression drives tumor cell migration and proliferation via c-Src activation.
  • AMOTL1 protein is upregulated during cancer progression and predicts relapse risk in lymph node metastasis.

Conclusions:

  • Hippo signaling promotes breast cancer progression by modulating AMOTL1 expression.
  • AMOTL1 is a key mediator linking Hippo pathway dysregulation to tumor aggressiveness and metastatic potential.