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Development of an improved inhibitor of Lats Kinases to promote regeneration of mammalian organs

ABSTRACT: Development of an improved inhibitor of Lats Kinases to promote regeneration of mammalian organs

PROVIDER: PRJNA804393 | ENA |

REPOSITORIES: ENA

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Development of an improved inhibitor of Lats Kinases to promote regeneration of mammalian organs

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LATS kinase-mediated selective disruption of CTCF genomic binding

Project description:We identified CTCF as a substrate of the LATS kinases. Under cellular stress conditions that activated LATS, CTCF was phosphorylated in a LATS-dependent manner and lost DNA-binding activity. LATS signaling target genes resided in CTCF-mediated insulated neighborhoods and depended on such chromatin organization to sustain their expression. Genome-wide CTCF DNA-binding profiling revealed that metabolic stress reduced CTCF occupancy specifically at a small subset of CTCF-binding sites that encompassed many LATS target genes and were most significantly associated with LATS signaling. Dissociation of CTCF from LATS target genes disrupted corresponding CTCF-mediated chromatin domains and downregulated LATS target gene expression.

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Small-molecule inhibition of Lats kinases promotes Yap-dependent proliferation in postmitotic mammalian tissues

Project description:Small-molecule inhibition of Lats kinases promotes Yap-dependent proliferation in postmitotic mammalian tissues

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Microarray of primary human breast cells with or without Hippo kinases LATS1/2

Project description:Perturbation of the tightly regulated dynamic process of cell fate underlies many human diseases. The molecular mechanisms regulating breast cell fate in the hierarchically organized luminal and basal lineages of breast epithelium remain largely elusive. We performed a high-content confocal image-based shRNA screen for regulators of primary human breast cell fate. Inhibition of the Hippo kinases LATS was found to promote luminal fate and increase the number of progenitors, which is a paradox given that Hippo effectors YAP/TAZ have been associated with basal fate. Mechanistically, LATS loss increases the activities of YAP/TAZ and ERα, which in concert control breast cell fate via intrinsic and paracrine effects. Reduced LATS expression is found in breast cancers with a poor prognosis; this diminishes the sensitivity of ERα-positive- and increases the sensitivity of ERα-negative cancers to endocrine therapy. Thus, in this study we have unraveled crosstalk between Hippo and estrogen signaling and shown that LATS loss triggers expansion of luminal progenitors, the highly suspected cell-of-origin in most breast cancers. In this dataset, we provide microarray gene expression analysis of normal breast epithelial cells, freshly dissociated from reduction mammoplasties, in which LATS1/2 were knocked down comparing it to non-targeting control expressing breast cells.

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LATS regulates heavy metal response

Project description:LATS regulates heavy metal response

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Fission yeast NDR/LATS kinase Orb6 regulates exocytosis via phosphorylation of exocyst complex

Project description:NDR/LATS kinases regulate multiple aspects of cell polarity and morphogenesis from yeast to mammals, but few of their substrates are known. Fission yeast NDR/LATS kinase Orb6 has been proposed to control cell polarity via spatial regulation of Gef1, a guanine nucleotide exchange factor for the small GTPase Cdc42. Here we show that Orb6 plays a critical role as a positive regulator of exocytosis, independent of Gef1. Through Orb6 inhibition in vivo and quantitative global phosphoproteomics, we identify several proteins involved in membrane trafficking as Orb6 targets, and we confirm Sec3 and Sec5, conserved components of the exocyst complex, as substrates of Orb6 both in vivo and in vitro. Our results suggest that Orb6 kinase activity is crucial for exocyst localization to actively-growing cell tips and for exocyst activity during septum dissolution after cytokinesis. We further show that Orb6 phosphorylation of Sec3 serine-201 contributes to exocyst function in parallel with exocyst protein Exo70. We propose that Orb6 contributes to polarized growth by regulating membrane trafficking at multiple levels.

2019-01-31 | PXD009408 | Pride

Small-molecule inhibition of Lats kinases may promote Yap-dependent proliferation in postmitotic mammalian tissues.

Project description: Not available

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Small-molecule inhibition of Lats kinases promotes Yap-dependent proliferation in postmitotic mammalian tissues

Project description:We report on the gene expression changes associated with Lats1/2 inhibition in supporting cells of the vestibular inner ear sensory epithelium

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Effect of NIBR-LTSi treatment on gene expression in mouse intestinal organoids

Project description:The YAP/Hippo pathway is a key regulator of organ growth and size regulation and is involved in safeguarding multiple tissue stem cell compartments. LATS kinases phosphorylate and thereby inactivate YAP, thus representing a potential direct drug target for promoting tissue regeneration. We report on the gene expression changes associated with YAP activation by the selective small molecule LATS kinase inhibitor NIBR-LTSi in mouse intestinal organoids. We show that, LATS-LTSi activates YAP signalling, promotes proliferation, induces a regenerative phenotype and blocks differentiation.

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