AMOTL1 Promotes Breast Cancer Progression and Is Antagonized by Merlin

Neoplasia : an International Journal for Oncology Research
Christophe CoudercDominique Lallemand

Abstract

The Hippo signaling network is a key regulator of cell fate. In the recent years, it was shown that its implication in cancer goes well beyond the sole role of YAP transcriptional activity and its regulation by the canonical MST/LATS kinase cascade. Here we show that the motin family member AMOTL1 is an important effector of Hippo signaling in breast cancer. AMOTL1 connects Hippo signaling to tumor cell aggressiveness. We show that both canonical and noncanonical Hippo signaling modulates AMOTL1 levels. The tumor suppressor Merlin triggers AMOTL1 proteasomal degradation mediated by the NEDD family of ubiquitin ligases through direct interaction. In parallel, YAP stimulates AMOTL1 expression. The loss of Merlin expression and the induction of Yap activity that are frequently observed in breast cancers thus result in elevated AMOTL1 levels. AMOTL1 expression is sufficient to trigger tumor cell migration and stimulates proliferation by activating c-Src. In a large cohort of human breast tumors, we show that AMOTL1 protein levels are upregulated during cancer progression and that, importantly, the expression of AMOTL1 in lymph node metastasis appears predictive of the risk of relapse. Hence we uncover an important mechanism by whic...Continue Reading

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Citations

Aug 16, 2016·Cellular Signalling·Helena J Janse van Rensburg, Xiaolong Yang
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Mar 13, 2021·Scientific Reports·Diala KantarAlexandre Djiane
Dec 8, 2019·Molecular Therapy. Nucleic Acids·Rongying OuYunsheng Xu

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Datasets Mentioned

BETA
GSE21653
GSE64857
GSE63885

Methods Mentioned

BETA
xenografts
PCR
biopsies
xenograft
pull
GTPases

Software Mentioned

AMOT
Jetset

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