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Beta-arrestin-2 deficiency effect on intestinal tumorigenesis in Apc-mutated mice

ABSTRACT: Amoung their pleiotropic functions, a role was recently assigned for b-arrestin scaffold proteins in tumor growth, angiogenesis and invasion. In order to elucidate the roles of b-arrestins in tumour developement in intestinal epithelium initiated by Apc mutation, we determined the effects of b-arrestin gene deletion on intestinal polypolis using ApcD14/+ mice, a relevant mouse model of human intestinal tumorigenesis.Here we show that unlike b-arrestin1, absence of b-arrestin2 dramatically decreased the number of spontaneously developping intestinal tumors in ApcD14/+ mice.The size of residual tumors was similarto that of controls, suggesting that their growth is b-arrestin2-independent. This result demonstrated a role for b-arrestin2 in the early development of a tumor subset. Gene expression profils analysis of ApcD14/+:Arrb2+/+ and ApcD14/+:Arrb2-/- tumors showed two distinct clusters among ApcD14/+:Arrb2+/+ tumors and one of them was statistically more correlated to ApcD14/+:Arrb2-/- tumors than to the other ApcD14/+:Arrb2+/+ cluster, eventhough a number of genes saw their expression affected in ApcD14/+:Arrb2-/- tumors only. Altogether, our data unravel an unexpected early diversity among intestinal tumors and a crucial role for b-arrestin2 in early tumor development in Apc-mutated mice.

ORGANISM(S): Mus musculus

PROVIDER: GSE24575 | GEO | 2012/01/20

SECONDARY ACCESSION(S): PRJNA133595

REPOSITORIES: GEO

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beta-arrestin-2 deficiency effect on intestinal tumorigenesis in Apc-mutated mice

Project description:Amoung their pleiotropic functions, a role was recently assigned for b-arrestin scaffold proteins in tumor growth, angiogenesis and invasion. In order to elucidate the roles of b-arrestins in tumour developement in intestinal epithelium initiated by Apc mutation, we determined the effects of b-arrestin gene deletion on intestinal polypolis using ApcD14/+ mice, a relevant mouse model of human intestinal tumorigenesis.Here we show that unlike b-arrestin1, absence of b-arrestin2 dramatically decreased the number of spontaneously developping intestinal tumors in ApcD14/+ mice.The size of residual tumors was similarto that of controls, suggesting that their growth is b-arrestin2-independent. This result demonstrated a role for b-arrestin2 in the early development of a tumor subset. Gene expression profils analysis of ApcD14/+:Arrb2+/+ and ApcD14/+:Arrb2-/- tumors showed two distinct clusters among ApcD14/+:Arrb2+/+ tumors and one of them was statistically more correlated to ApcD14/+:Arrb2-/- tumors than to the other ApcD14/+:Arrb2+/+ cluster, eventhough a number of genes saw their expression affected in ApcD14/+:Arrb2-/- tumors only. Altogether, our data unravel an unexpected early diversity among intestinal tumors and a crucial role for b-arrestin2 in early tumor development in Apc-mutated mice. 16 tumors from ApcD14/+:Arrb2+/+ mice and 13 tumors from ApcD14/+:Arrb2-/- mice

2012-01-20 | E-GEOD-24575 | biostudies-arrayexpress

Gene expression analysis of tumors from ApcD14/+ mice

2012-01-20 | E-GEOD-24576 | biostudies-arrayexpress

Gene expression analysis of tumors from ApcD14/+ mice

2012-01-20 | GSE24576 | GEO

β2-adrenergic receptor transcriptional response in HEK293 wild type, β-arrestin1/2 KO and Gαs KO cells upon isoproterenol stimulation.

Project description:The role of nuclear signaling by β2-adrenergic receptor (β2AR) through β-arrestins in the absence of a functional Gαs protein has not been evaluated. This has prevented a comprehensive understanding of the relative contribution of Gαs and β-arrestins to the overall β2AR signaling, thereby limiting our appreciation of how β-arrestin- or Gαs-biased ligands may affect their therapeutic outcomes. To explore the role of Gαs and β-arrestin in nuclear transcriptional programs in a global unbiased approach, we performed RNA sequencing studies in cells lacking either of these two signaling arms downstream from β2AR, followed by detailed bioinformatics analysis of gene expression signatures. We noticed multiple genes whose individual expression levels were distinct in β-arrestin1/2 and Gαs KO cells. Rather than focusing on the individual gene level, we performed a detailed analysis of gene signatures taking advantage of large datasets that were recently compiled as part of the Molecular Signatures Database (MSigDB). This approach supported that β-arrestins are not required for the activation of PKA gene signatures, including prior datasets of forskolin and CREB1 targets, while Gαs is essential. β2AR activation also led to significant changes in multiple MAPK signatures, which clearly support the activation of MAPK nuclear transcriptional programs by these receptors. Although individual variations do exist reflecting the complexities of β-arrestin- and Gαs-mediated signaling events, stimulation of these MAPK regulated gene signatures was not significantly reduced in β-arrestin1/2 KO cells but abolished in Gαs KO cells.

2023-10-17 | GSE245270 | GEO

Impact of beta-arrestin-2 deficiency on intestinal tumorigenesis in Apc-mutated mice

Project description:This SuperSeries is composed of the following subset Series: GSE24575: Beta-arrestin-2 deficiency effect on intestinal tumorigenesis in Apc-mutated mice GSE24576: Gene expression analysis of tumors from ApcD14/+ mice Refer to individual Series

2012-01-20 | E-GEOD-24577 | biostudies-arrayexpress

Exploring GPCR-arrestin interfaces with genetically encoded crosslinkers

Project description:-arrestins (arr1 and arr2) are ubiquitous regulators of G protein-coupled receptor (GPCR) signalling. Available data suggest that -arrestins dock to different receptors in different ways. However, the structural characterization of arrestin-GPCR complexes is challenging and alternative approaches to study arrestin-GPCR complexes are needed. Here, starting from the finger loop as a major site for the interaction of arrestins with GPCRs, we genetically incorporate non-canonical amino acids for photo- and chemical crosslinking into arr1 and arr2 and explore binding topologies to GPCRs forming either stable or transient complexes with arrestin: the vasopressin receptor 2 (rhodopsin-like), the corticotropin releasing factor receptor 1 and the parathyroid hormone receptor 1 (both secretin-like). We show that each receptor leaves a unique footprint on arrestin, whereas the two -arrestins yield quite similar crosslinking patterns. Furthermore, we show that the method allows defining the orientation of arrestin respect to the GPCR. Finally, we provide direct evidence for the formation of arrestin oligomers in the cell.

2020-09-21 | PXD020418 | Pride

Beta arrestin1 associated genomic regions in nicotine induced Non-Small Cell Lung Carcinoma (NSCLC) cell line A549

Project description:The multifunctional scaffolding protein M-NM-2-arrestin-1 plays a vital role in mediating the proliferative effects of nicotine through nAChR signaling. M-NM-2-arrestins were initially known as negative regulators of GPCR mediated signaling as they promote internalization and desensitization of GPCRs. However, new roles of M-NM-2-arrestins in receptor trafficking and signaling have been discovered in recent years. They are known to regulate signaling through a number of receptors such as Notch, endothelin A receptor, frizzled, smoothened and the nicotinic cholinergic receptors. Studies from our lab revealed that nAChR signaling induces the translocation of M-NM-2-arrestin-1 to the nucleus, in a Src dependent manner, where it directly binds to the proliferative E2Fs. Furthermore, the nuclear translocation of M-NM-2-arrestin-1 results in recruitment of p300 to E2F1 regulated proliferative promoters facilitating histone acetylation and transcription of these promoters. Given the role of M-NM-2-arrestin-1 in nicotine induced gene expression, we attempted to explore the global association of M-NM-2-arrestin-1 to the genomic regions upon nicotine stimulation by ChIP sequencing. It was found that M-NM-2-arrestin-1 is recruited on the promoters of many genes that regulate EMT as well as other regulatory pathways. In this assay, M-NM-2-arrestin-1 was found to be associated with the promoter regions of genes such as ZNF768, ZNF131, CSF3R, HMGA2, TAL1, RCC1, NKX2-4 etc in response to nicotine stimulation. Serum starved/quiescent A549 cells and Nicotine stimulated A549 cells

2013-12-16 | E-GEOD-40689 | biostudies-arrayexpress

Beta arrestin1 associated genomic regions in nicotine induced Non-Small Cell Lung Carcinoma (NSCLC) cell line A549

Project description:The multifunctional scaffolding protein β-arrestin-1 plays a vital role in mediating the proliferative effects of nicotine through nAChR signaling. β-arrestins were initially known as negative regulators of GPCR mediated signaling as they promote internalization and desensitization of GPCRs. However, new roles of β-arrestins in receptor trafficking and signaling have been discovered in recent years. They are known to regulate signaling through a number of receptors such as Notch, endothelin A receptor, frizzled, smoothened and the nicotinic cholinergic receptors. Studies from our lab revealed that nAChR signaling induces the translocation of β-arrestin-1 to the nucleus, in a Src dependent manner, where it directly binds to the proliferative E2Fs. Furthermore, the nuclear translocation of β-arrestin-1 results in recruitment of p300 to E2F1 regulated proliferative promoters facilitating histone acetylation and transcription of these promoters. Given the role of β-arrestin-1 in nicotine induced gene expression, we attempted to explore the global association of β-arrestin-1 to the genomic regions upon nicotine stimulation by ChIP sequencing. It was found that β-arrestin-1 is recruited on the promoters of many genes that regulate EMT as well as other regulatory pathways. In this assay, β-arrestin-1 was found to be associated with the promoter regions of genes such as ZNF768, ZNF131, CSF3R, HMGA2, TAL1, RCC1, NKX2-4 etc in response to nicotine stimulation.

2013-12-16 | GSE40689 | GEO

Molecular mechanism of β-arrestin-2 pre-activation by phosphatidylinositol 4,5-bisphosphate

Project description:Arrestins are a protein family that regulate G protein-coupled receptor (GPCR) signaling, with four distinct members in mammals (arrestin 1–4). Phosphorylated residues of G protein-coupled receptors bind to the N-domain of arrestin, resulting in C-terminus release. This induces further allosteric conformational changes, such as polar core disruption, alteration of interdomain loops, and domain rotation, which transform arrestins into the receptor-activated state. It is widely accepted that arrestin activation occurs by conformational changes propagated from the N- to the C-domain. However, recent studies have revealed that binding of phosphatidylinositol 4,5-bisphosphate (PIP2) to the C-domain transforms arrestins into an active state. In this study, we aimed to elucidate the mechanisms underlying PIP2-induced arrestin activation. We compared the conformational changes of β-arrestin-2 upon binding of PIP2 or phosphorylated C-tail peptide of vasopressin receptor type 2 (V2Rpp) using hydrogen/deuterium exchange mass spectrometry (HDX-MS). Introducing point mutations on the potential routes of the allosteric conformational changes and analyzing these mutant constructs with HDX-MS revealed that PIP2-binding at the C-domain affects the back loop, which destabilizes the gate loop and β-strand XX to transform β-arrestin-2 into the pre-active state.

2024-07-15 | PXD049391 | Pride

Chemokine receptor CXCR7 activates Aurora Kinase A and promotes neuroendocrine prostate cancer growth

Project description:CXCR7, an atypical chemokine receptor (ACKR3), is up-regulated in NEPC, and its expression is associated with molecular markers of NEPC and cell proliferation. Transcriptomic analyses revealed a major role of CXCR7 in regulating downstream genes involved in the cell cycle and mitotic spindle. Membrane-bound CXCR7 is known to recruit β-arrestin (ARRB2), and the complex internalizes into clathrin-coated vesicles where they act as a scaffold for cytoplasmic kinase assembly and substrate activation. We identify Aurora Kinase A (AURKA) as a top candidate that is binding to and activated by CXCR7-ARRB2. Immunofluorescence confocal microscopy detected high-density CXCR7, ARRB2, and AURKA in the pericentrosomal area with focal staining of ARRB2 and ARUKA at centrosomes. Mass spectrometry showed that CXCR7 interacts with many proteins associated with intracellular vesicles, microtubules, and Golgi apparatus. CXCR7-ARRB2-containing vesicles traffic along the microtubules to the perinuclear Golgi apparatus, where CXCR7-ARRB2 interacts with AURKA to promote its activation and cell growth. Finally, we showed that pharmacological inhibitors of AURKA abolish CXCR7-driven tumor growth. Our study reveals CXCR7-mediated activation of AURKA and establishes CXCR7 and its downstream kinases as critical targets for therapeutic intervention in CRPC or NEPC patients.

2023-05-14 | GSE199274 | GEO

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