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Genome-wide analysis of mRNA levels in response to a Pin1 knock-down

ABSTRACT: Pin1 is a prolyl isomerase that plays an important role in cancer, Alzheimer's disease, and asthma. To understand how Pin1 levels affect mRNA abundance on a genome-wide scale, we knocked down Pin1 by siRNA and used microarray-based gene expression profiling to identify candidate genes that are significantly up- or down-regulated by Pin1 siRNA. The data provide important information on Pin1-responsive genes. We find that genes that are inherently unstable and have short half-lives are targeted by Pin1.

ORGANISM(S): Homo sapiens

PROVIDER: GSE41868 | GEO | 2012/10/27

SECONDARY ACCESSION(S): PRJNA178358

REPOSITORIES: GEO

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Genome-wide analysis of mRNA levels in response to a Pin1 knock-down

Project description:Pin1 is a prolyl isomerase that plays an important role in cancer, Alzheimer's disease, and asthma. To understand how Pin1 levels affect mRNA abundance on a genome-wide scale, we knocked down Pin1 by siRNA and used microarray-based gene expression profiling to identify candidate genes that are significantly up- or down-regulated by Pin1 siRNA. The data provide important information on Pin1-responsive genes. We find that genes that are inherently unstable and have short half-lives are targeted by Pin1. Total RNA was obtained from HeLa cells treated with either control siRNA or an siRNA towards Pin1. There were three replicates each for the control and the siRNA-treated cells. The average signal for the three replicates is reported.

2012-10-27 | E-GEOD-41868 | biostudies-arrayexpress

Genetic interactions and transcriptomics implicate fission yeast CTD prolyl isomerase Pin1 as an agent of RNA 3' processing and transcription termination that functions via its effects on CTD phosphatase Ssu72

Project description:This RNA-Seq analysis compares gene expression of the peptidyl-prolyl isomerase Pin1 mutant pin1∆ contrasting to the WT in the fission yeast S. pombe

2020-03-20 | GSE144092 | GEO

Expression data from Pin1 KO and WT mice

Project description:The prolyl isomerase PIN1 has been identified as a regulator of phosphorylation signalling that catalyses the conversion of specific phosphorylated motifs between the two completely distinct conformations in a subset of proteins. PIN1 regulates diverse cellular processes, including growth-signal responses, cell-cycle progression, cellular stress responses, neuronal function and immune responses. We used microarrays to detail the global gene expression of mammary epithelial cells (MECs) and neuron cells (NCs) in Pin1 KO and WT mice

2015-03-26 | GSE49971 | GEO

Pin1 mediates Ab42-mediated dendritic spine loss

Project description:Early-stage Alzheimer's disease is characterized by the loss of dendritic spines in the neocortex of the brain. This phenomenon precedes tau pathology, plaque formation, and neurodegeneration and likely contributes to synaptic loss, memory impairment, and behavioral changes in patients. Studies suggest that spine loss is induced by soluble, multimeric Ab42, whose post-synaptic signaling activates the protein phosphatase calcineurin. We investigated how calcineurin causes spine pathology and found that the cis-trans prolyl isomerase Pin1 is a critical downstream target of Ab42/calcineurin signaling. In spines, Pin1 interacts with and is dephosphorylated by calcineurin, which rapidly suppresses its isomerase activity. Pin1 knockout or Ab42 exposure induced mature spine loss in Ab42-treated wild-type cells but had no effect on Pin1 null neurons. The data implicate Pin1 in spine maintenance and synaptic loss in early Alzheimer's disease.

2018-02-14 | MSV000082066 | MassIVE

Pin1 is required for sustained B cell proliferation upon oncogenic activation of Myc

Project description:The c-myc proto-oncogene is activated by translocation in Burkitt's lymphoma and substitutions in codon 58 stabilize the Myc protein or augment its oncogenic potential. In wild-type Myc, phosphorylation of Ser 62 and Thr 58 provide a landing pad for the peptidyl prolyl-isomerase Pin1, which in turn promotes Ser 62 dephosphorylation and Myc degradation. However, the role of Pin1 in Myc-induced lymphomagenesis remains unknown. We show here that genetic ablation of Pin1 reduces lymphomagenesis in EÂµ-myc transgenic mice. In both Pin1-deficient B-cells and MEFs, the proliferative response to Myc was selectively impaired, with no alterations in Myc-induced apoptosis or mitogen-induced cell cycle entry. This proliferative defect wasn't attributable to alterations in either Ser 62 phosphorylation or Myc-regulated transcription, but to the indirect activation of an Arf-p53 dependent cytostatic response. Pin1 silencing in lymphomas retarded disease progression in mice, making Pin1 an attractive therapeutic target in Myc-driven tumors. RNAseq samples of Pin1+/+ control (n=4), Pin1 -/- control (n=2), Pin1+/+ EÂµ-myc pre-tumoral (n=3), and Pin1-/- EÂµ-myc pre-tumoral (n=4) B cells.

2016-06-14 | E-GEOD-77482 | biostudies-arrayexpress

Sulfopin, a covalent inhibitor of Pin1, blocks Myc-driven tumors in vivo

Project description:The peptidyl-prolyl isomerase, Pin1, is exploited in cancer to activate oncogenes and inactivate tumor suppressors. However, despite considerable efforts, Pin1 has remained an elusive drug target. Here, we screened an electrophilic fragment library to identify covalent inhibitors targeting Pin1’s active site Cys113, leading to the development of Sulfopin, a nanomolar Pin1 inhibitor. Sulfopin is highly selective, as validated by two independent chemoproteomics methods, achieves potent cellular and in vivo target engagement, and phenocopies Pin1 genetic knockout. Pin1 inhibition had only a modest effect on cancer cell line viability. Still, Sulfopin induced downregulation of c-Myc target genes, reduced tumor progression and conferred survival benefit in murine and zebrafish models of MYCN-driven neuroblastoma, and in a murine model of pancreatic cancer. Our results demonstrate that Sulfopin is a suitable chemical probe for assessing Pin1-dependent pharmacology in cells and in vivo, and that Pin1 warrants further investigation as a potential cancer drug target.

2021-04-01 | GSE166786 | GEO

Pin1 is required for sustained B cell proliferation upon oncogenic activation of Myc

Project description:The c-myc proto-oncogene is activated by translocation in Burkitt's lymphoma and substitutions in codon 58 stabilize the Myc protein or augment its oncogenic potential. In wild-type Myc, phosphorylation of Ser 62 and Thr 58 provide a landing pad for the peptidyl prolyl-isomerase Pin1, which in turn promotes Ser 62 dephosphorylation and Myc degradation. However, the role of Pin1 in Myc-induced lymphomagenesis remains unknown. We show here that genetic ablation of Pin1 reduces lymphomagenesis in Eµ-myc transgenic mice. In both Pin1-deficient B-cells and MEFs, the proliferative response to Myc was selectively impaired, with no alterations in Myc-induced apoptosis or mitogen-induced cell cycle entry. This proliferative defect wasn't attributable to alterations in either Ser 62 phosphorylation or Myc-regulated transcription, but to the indirect activation of an Arf-p53 dependent cytostatic response. Pin1 silencing in lymphomas retarded disease progression in mice, making Pin1 an attractive therapeutic target in Myc-driven tumors.

2016-06-14 | GSE77482 | GEO

Prolyl Isomerase PIN1 Modulates Oncogene Induced Senescence by Regulating PML-Nuclear Body Dynamics

Project description:Mammalian cells possess intrinsic mechanisms to prevent tumorigenesis upon deleterious mutations, including oncogene-induced senescence (OIS). The molecular mechanisms underlying OIS are, however, complex, and remain to be characterized. In this study, we analyzed the changes in the nuclear (phospho)proteome during the progression of OIS. Interestingly, we found that most of the phosphosites regulated during OIS were Prolyl Isomerase Pin1 targets. Our results show that Pin1 is a key regulator of several PML-NB proteins, specifically regulating several proteins upon oncogene activation. We have found that the constitutive PML-NB proteins are significantly regulated when PIN1 is depleted. Furthermore, we show that PIN1 knockdown promotes cell proliferation, while diminishing the senescence phenotype and hallmarks of senescence such as p21. Thus, our data provides preliminary evidence that PML-NB proteins are involved in regulating OIS via phosphorylation, and that the prolyl isomerase PIN1 acts as a tumor suppressor in response to oncogenic ER:RasG12V activation.

| MSV000090326 | MassIVE

Stabilization of Pin1 by USP34 promotes Ubc9 isomerization and protein sumoylation in glioma stem cells to augment glioblastoma malignancy

Project description:he unique prolyl isomerase Pin1 that promotes protein conformational changes is a pivotal therapeutic target in many cancers, but little is known about the regulation of Pin1 protein stability. We previously found that Pin1 was highly expressed in glioma stem cells (GSCs) relative to non-stem tumor cells (NSTCs). Interestingly, treatment of the proteasome inhibitor MG132 markedly restored Pin1 protein expression in NSTCs to a level similar to GSCs. We therefore sought to identify the molecular regulators controlling the proteasomal degradation of Pin1 by mass spectrometry analysis of Pin1-interacting proteins in GSCs. The results showed that Pin1 interacts with a deubiquitinase USP34 in GSCs, suggesting that Pin1 may be stabilized by USP34.

2024-01-26 | PXD041043 | Pride

PIN1 isomerase promotes the initiation and progression of bladder cancer through SREBP2-mediated cholesterol biosynthesis pathway

Project description:Bladder cancer, one of the most diagnosed cancers worldwide, is associated with high morbidity, mortality, and a poor prognosis. The PIN1 phospho-dependent prolyl isomerase is frequently overexpressed in many human cancer types and affects tumor initiation and progression through disrupting the balance of oncoprotein and tumor suppressor protein signaling. However, the functional pSer/Thr.Pro protein substrates of PIN1 and its effects on downstream signaling in bladder carcinogenesis remain largely unknown. Phenotypically, we discovered that ablation of Pin1 in human/mouse bladder cancer cells and organoids formed from mouse primary urothelial cells resulted in decreased cell proliferation, stemness maintenance, cell invasion, migration, urothelium clearance capacity, and reduced free/total cholesterol levels in vitro. Re-expressing Pin1 in Pin1 knockout cells reversed the defects caused by lack of Pin1. Moreover, in vivo subcutaneous xenograft and allograft transplantation mouse models combined with an orthotopic implantation model were utilized to confirm a positive role for Pin1 in controlling tumor growth and potential metastasis. Therapeutically, a combination of the sulfopin PIN1 inhibitor and the simvastatin HMGCR inhibitor was shown to suppress cell proliferation in vitro and tumor growth in vivo synergistically. Mechanistically, we observed a negative enrichment of SREBP2-driven cholesterol metabolism pathways in PIN1 knockout cells via RNA-sequencing and used a suite of diverse molecular and biochemical approaches to show that PIN1 interacts with JNK-dependent phosphorylated SREBP2 (Ser455) and vice versa. These results indicate that active cholesterol biosynthesis pathway in bladder cancer cells is regulated by PIN1-mediated isomerization and JNK-mediated phosphorylation of its key transcriptional factor SREBP2. These findings emphasize that PIN1 can act as a regulator and potential therapeutic target in bladder cancer.

2024-11-17 | GSE262761 | GEO

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