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YAP overcomes restriction of translation induced by nutrient deprivation through restoration of mTORC1 activity [293AD]

ABSTRACT: The Hippo pathway downstream effectors YAP and TAZ display oncogenic potential via their transcriptional co-activator function, mediated primarily by binding to TEAD transcription factors. Many studies have focused on identifying YAP/TAZ-TEAD target genes, but their role in the regulation of protein synthesis has remained largely unexplored. Here we show that YAP activation is sufficient to overcome the global translation restriction of 5TOP-containing mRNAs, which is induced by serum deprivation and dependent on the inactivation of mTORC1. We found that YAP/TAZ repressed the expression of DDIT4, a negative regulator of mTORC1 whose expression is otherwise upregulated by serum deprivation. Forced expression of DDIT4 was sufficient to suppress translation and transformative potential of serum-unresponsive uveal melanoma cells, which harbor G protein mutations. Our findings highlight crosstalk between Hippo-YAP/TAZ and mTORC1 pathways in the regulation of translation and offer a new perspective towards understanding YAP/TAZ-driven malignancies.

ORGANISM(S): Homo sapiens

PROVIDER: GSE224261 | GEO | 2024/10/01

REPOSITORIES: GEO

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Project description:Uncontrolled Transforming growth factor-beta (TGFβ) signaling promotes aggressive metastatic properties in late-stage breast cancers. However, how TGFβ-mediated cues are directed to induce late-stage tumorigenic events is poorly understood, particularly given that TGFβ has clear tumor suppressing activity in other contexts. Here we demonstrate that the transcriptional regulators TAZ and YAP (TAZ/YAP), key effectors of the Hippo pathway, are necessary to promote and maintain TGFβ-induced tumorigenic phenotypes in breast cancer cells. Interactions between TAZ/YAP, TGFβ-activated SMAD2/3, and TEAD transcription factors reveal convergent roles for these factors in the nucleus. Genome-wide expression analyses indicate that TAZ/YAP, TEADs and TGFβ-induced signals coordinate a specific pro-tumorigenic transcriptional program. Importantly, genes cooperatively regulated by TAZ/YAP, TEAD, and TGFβ, such as the novel targets NEGR1 and UCA1, are necessary for maintaining tumorigenic activity in metastatic breast cancer cells. Nuclear TAZ/YAP also cooperate with TGFβ signaling to promote phenotypic and transcriptional changes in non-tumorigenic cells to overcome TGFβ repressive effects. Our work thus identifies crosstalk between nuclear TAZ/YAP and TGFβ signaling in breast cancer cells, revealing novel insight into late-stage disease-driving mechanisms. Expression profiling was conducted following the repression of the transcriptional regulators TAZ and YAP (TAZ/YAP), the TEAD family of transcription factors (TEAD1/2/3/4), or the TGFb signaling pathway (with SB-431542, an inhibitor of the TBRI recpeptor) in human MDA-MB-231-LM2 breast cancer cells treated with TGFβ1. Human MDA-MB-231-LM2-4 breast cancer cells were transfected with control siRNA, or siRNAs targeting TAZ/YAP or all four TEADs and were treated 24 hours later with 500pM TGFβ1 or 5mM SB-431542 for an additional 24 hours. Total RNA was isolated and twelve microarrays in total were performed, with each condition carried out three times on separate days. The Boston University Microarray Core generated the data using the Affymetrix Human Gene 1.0 St Array.

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YAP overcomes restriction of translation induced by nutrient deprivation through restoration of mTORC1 activity [293AD]

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