Dataset Information

Colorectal tumors require NUAK1 for protection from oxidative stress

ABSTRACT: NUAK1 is a member of the AMPK family of kinases involved in regulation of cell adhesion, metabolism and stress responses. Our previous analysis revealed a requirement for NUAK1 to sustain viability when MYC is overexpressed. Human colorectal cancer (CRC) shows near uniform overexpression of MYC, suggesting that this cancer may be particularly amenable to NUAK1 inhibition. This work reveals that elevated NUAK1 expression in human CRC correlates with more aggressive disease, lymph node metastasis and reduced overall survival. Deletion of Nuak1 in murine intestines prevented outgrowth of colonic tumors driven by loss of Apc and KRas mutation, while depletion of Nuak1 in pre-existing tumors drove rapid tumor regression. Mechanistically, we show that NUAK1 promotes anti-oxidant gene expression by facilitating nuclear import of NRF2. Deletion or inhibition of NUAK1 renders cells vulnerable to oxidative stress and provision of exogenous anti-oxidants protects cells in culture and colonic tumors in situ from Nuak1 depletion.

INSTRUMENT(S): LTQ Orbitrap Elite

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Epithelial Cell, Colon

SUBMITTER: Sara Zanivan

LAB HEAD: Sara Zanivan

PROVIDER: PXD008229 | Pride | 2018-02-26

REPOSITORIES: Pride

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Publications

Colorectal Tumors Require NUAK1 for Protection from Oxidative Stress.

Port Jennifer J Muthalagu Nathiya N Raja Meera M Ceteci Fatih F Monteverde Tiziana T Kruspig Björn B Hedley Ann A Kalna Gabriela G Lilla Sergio S Neilson Lisa L Brucoli Martina M Gyuraszova Katarina K Tait-Mulder Jacqueline J Mezna Mokdad M Svambaryte Silvija S Bryson Amy A Sumpton David D McVie Allan A Nixon Colin C Drysdale Martin M Esumi Hiroyasu H Murray Graeme I GI Sansom Owen J OJ Zanivan Sara R SR Murphy Daniel J DJ

Cancer discovery 20180302 5

Exploiting oxidative stress has recently emerged as a plausible strategy for treatment of human cancer, and antioxidant defenses are implicated in resistance to chemotherapy and radiotherapy. Targeted suppression of antioxidant defenses could thus broadly improve therapeutic outcomes. Here, we identify the AMPK-related kinase NUAK1 as a key component of the antioxidant stress response pathway and reveal a specific requirement for this role of NUAK1 in colorectal cancer. We show that NUAK1 is act ...[more]

PMID: 29500295

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Project description:MASTL (Microtubule associated serine-threonine kinase-like) is a relatively recently identified mitotic accelerator. There are also indications of its role in cancer progression, especially in breast cancer, but the molecular mechanisms behind this and the cell cycle independent functions of MASTL are poorly understood. Regulation of cell adhesion and actin dynamics play a central role in governing cell contractility, migration and cell division in normal and cancer cells. Here, we identify MASTL as regulator of cell contractility and activator of the transcriptional co-activator MTRF-A. We show that depletion of MASTL increases cell contact with the extracellular matrix, reduces contractile actin stress fibers in normal and breast cancer cells. Importantly, depletion of MASTL also leads to strongly impairs motility of breast cancer cells. Our transcriptome and proteome profiling revealed that depletion of MASTL impairs transcription and expression of several MRTF-A target genes implicated in cellular movement and actomyosin contraction, including Rho Guanine nucleotide exchange factor 2 (GEF-H1, ARHGEF2) and tropomyosin 4.2 (TPM4). Mechanistically, we find that MASTL is necessary for serum-induced activation of SRF/MTRF-A transcription and that exogenous expression of GEF-H1 in MASTL depleted cells is sufficient to restore cell contractility. Taken together, our results suggest that MASTL is a previously undescribed key regulator of cell morphology and the actin cytoskeleton through transcriptional control of multiple adhesion and actin cytoskeleton regulating genes with key roles in contractility, cell adhesion and migration. MASTL (Microtubule associated serine-threonine kinase-like) is a relatively recently identified mitotic accelerator. There are also indications of its role in cancer progression, especially in breast cancer, but the molecular mechanisms behind this and the cell cycle independent functions of MASTL are poorly understood. Regulation of cell adhesion and actin dynamics play a central role in cell migration, morphology and cancer progression, but the role of MASTL in these processes has not been evaluated. Here, we show that depletion of MASTL increases cell contact with the extracellular matrix in breast cancer cells. Importantly, depletion of MASTL also leads to reduction of contractile actin stress fibers and decreased cell motility. Further, our transcriptome and proteome profiling revealed that mechanistically depletion of MASTL impairs transcription and expression of regulators of cellular movement and actomyosin contraction, including Rho Guanine nucleotide exchange factor 2 (GEF-H1, ARHGEF2) and tropomyosin 4.2 (TPM4). Further, we show that the transcriptional changes are caused by defectiveness of the serum response factor (SRF) signalling. Importantly, this study reveals advanced role for MASTL in interphase cells that activates a transcriptional program strongly impacting on the expression of regulators of cellular motility and actomyosin contraction.

Dataset Information

Colorectal tumors require NUAK1 for protection from oxidative stress

Publications

Colorectal Tumors Require NUAK1 for Protection from Oxidative Stress.

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