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Antisense oligonucleotide-mediated inclusion of the TRA2β ultraconserved poison exon induces the expression of a lncRNA with anti-tumor effects

ABSTRACT: Dysregulated expression of oncogenic splicing factors (SFs) occurs in human tumors in part through alterations in splicing of poison exons (PE), highly conserved exons that trigger RNA degradation. TRA2β is one such SF that undergoes PE suppression in tumor cells. Therefore, manipulation of TRA2β-PE can be a promising therapeutic strategy for cancer. Here, we demonstrate that low TRA2β-PE inclusion correlates with decreased patient survival across multiple tumor types. TRA2β-PE-targeting antisense oligonucleotides (ASOs) induce anti-cancer phenotypes and widespread transcriptomic alterations in cell culture models by causing both TRA2β protein knockdown and upregulation of TRA2β-PE-containing transcripts, which act as long-noncoding RNAs (lncRNAs) to sequester nuclear proteins. Finally, we demonstrate efficacy of TRA2β-PE-targeting ASOs in preclinical 3D organoid and in vivo patient-derived xenograft models. Together, this demonstrates that oncogenic SFs can be drugged using PE-targeting ASOs and elucidates a mechanism by which the TRA2β-PE acts both as a regulator of TRA2β protein expression and as a lncRNA that controls cancer cell growth.

INSTRUMENT(S): Q Exactive HF, LTQ Orbitrap Elite

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Cell Culture

DISEASE(S): Brain Glioblastoma Multiforme,Breast Cancer

SUBMITTER: SungHee Park

LAB HEAD: Olga Anczukow

PROVIDER: PXD042941 | Pride | 2024-12-20

REPOSITORIES: pride

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			Action	DRS
	F528568.dat	Other
	F528568.mgf	Mgf
	F528568.xml	Xml
	F528570.dat	Other
	F528570.mgf	Mgf

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Expression changes of proteins associated with the development of preeclampsia in maternal plasma: a case control study

Project description:Defective deep placentation, an abnormal transformation of the spiral arteries in the junctional zone of the myometrium, is known to cause significant obstetrical complications such as preeclampsia (PE), fetal growth restriction, and placental infarcts with fetal death. Serological biomarkers to predict and diagnose PE would help antenatal care and reduce the obstetrical complications. To discover biomarkers for prediction of PE, we first performed global proteome profiling of three pairs of maternal plasma samples obtained from the early second trimester pregnant women who subsequently developed PE and controls to identify proteins that were abundant in the patients. We further evaluated the expression changes of PE representing proteins in stored plasma samples of a cohort of subsequently developed PE and their matched controls by MRM assay. We identified both Complement C1s subcomponent (p-value = 0.041) and Protein AMBP (p-value = 0.043) were up-regulated in the cohort of PE plasma samples before manifestation of clinical disease. We propose that these proteins may be involved in the remodeling process of the spiral arteries even before the manifestation of PE. These proteins could be served as potential plasma biomarkers to predict pregnant women at increased risk of developing PE.

2018-07-05 | PXD003419 | Pride

Integrating multi-omics analyses unveil protein features of gestational diabetes mellitus and preeclampsia

Project description:As one of the most common maternal comorbidities, gestational diabetes mellitus (GDM) and preeclampsia (PE) are associated with maternal and infant health. Although the pathogenesis of PE and GDM remains controversial, oxidative stress is thought to be involved in the underlying pathology of GDM and PE. Protein lysine acetylation (Kac) plays an important regulatory role in biological processes. There is little data regarding the association of the maternal acetylome with GDM and PE. This study aimed to assess the multi-omics (proteome and acetylome) potential value in the underlying pathology for GDM and PE by label-free quantification proteomics technology. In our study, we included placental tissue from healthy individuals (n=6), GDM patients (n=6), and PE patients (n=6). We identified 22 overlapping DEPs (differentially expressed proteins) and 192 overlapping DAPs (differentially acetylated proteins) between the GDM and PE groups. Furthermore, 192 overlapping DAPs were mainly enriched in endoplasmic reticulum stress and ferroptosis pathways. Interestingly, endoplasmic reticulum stress, ferroptosis, and oxidative stress are believed to be related to each other. We also identified that acetylation of the HSP90AA1, HSPA8, PDIA3, GPX4, TF, and CP might serve as novel markers and better therapeutic targets in both complications. We thoroughly analyzed the key characteristics of proteome and acetylome in GDM and PE placental tissues, which may be useful for exploring the underlying pathology and discovering new biomarkers and therapeutic targets.

2024-01-25 | PXD032981 | Pride

Proteomic Analysis of Integrin a5 Associated Complexes Dependent upon Integrin Activation State in Zebrafish

Project description:Integrins are a major class of heterodimeric adhesion receptors composed of an a and b subunit that link the extracellular matrix (ECM) and the cytoskeleton across the cell membrane. When activated by either the intracellular (inside-out signaling) or extracellular (outside-in signaling) environment, integrins undergo a conformational change that increases the ligand binding affinity. As the primary receptor for ECM protein fibronectin, Integrin a5 plays a critical role in zebrafish somitogenesis. To better understand integrin activation in this context, we performed co-immunoprecipitation and Mass Spectrometry (MS) based proteomics using FLAG-tagged Integrin a5 alleles that alter it activation state: constitutive active mutant a5GAAKR and inactive ligand binding deficient mutant a5FYLDD, expressed in maternal zygotic a5 mutant (MZa5-/-) embryos. Our data provide an overview of Integrin associated proteins according to the activation state of the Integrin.

2021-05-27 | PXD024942 | Pride

Integrin a5, aV, and aVb3 in zebrafish embryos at the 12 somite stage

Project description:Integrins are a major class of heterodimeric adhesion receptors composed of an a and b subunit that mediate cell adhesion to the extracellular matrix (ECM). The extracellular matrix protein fibronectin is important for early vertebrate development, and Integrin a5b1 and aVb3 are the two primary fibronectin receptors. To better define the integrin – ECM protein network at 10-13 somite stage of zebrafish development, we performed co-immunoprecipitation and Mass Spectrometry (MS) based proteomics using FLAG-tagged Integrin a5, aV, and aVb3 expressed in maternal zygotic a5 mutant (MZa5-/-) embryos. We found that Integrin a5b1 and aVb1 are the functional fibronectin receptors, whereas Integrin aVb3 displayed low affinity to both fibronectins (Fn1a and Fn1b). In addition, basement membrane ligands Laminins (lama1, lamb1a, lamc1) are roughly equal in all three datasets while Thrombospondins (thbs3b, thbs4b) and cartilage oligomeric matrix protein (comp/thbs5) are found exclusively in the aV dataset. Our results suggest a diverse role of aV class integrins in ECM protein recruitment.

2021-09-10 | PXD024665 | Pride

Unbiased undepleted malignant pleural effusion proteomics study

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2022-10-14 | PXD035884 | Pride

Identification of microRNAs association with Rheumatoid Arthritis Synovial Fibroblasts using the Human TNF Transgenic Mouse Model

Project description:OBJECTIVE: MicroRNAs (miRNAs, miRs), a class of small non-coding RNA molecules, are posttranscriptional regulators involved in a plethora of cellular functions and have been proposed as potential therapeutic targets in various diseases, including rheumatoid arthritis (RA). In this study, we sought to discover novel miR associations in synovial fibroblasts (SFs), a key cell type mediating RA pathogenesis, by performing miR expression profiling on cells isolated from the human TNF transgenic mouse model (TghuTNF or Tg197). METHODS: miR expression in SFs isolated from 8-week-old, fully diseased TghuTNF and WT littermate control mice were determined by deep sequencing of small RNAs and the arthritic profile was established by pairwise comparisons of the two groups. qRT-PCR analysis was utilised for profile validation purposes and miR quantitation in patient SFs. Dysregulated miR target genes and pathways were predicted via bioinformatic algorithms. Synovial Fibroblasts isolated from TghuTNF mice (2 x biological replicates) and control WT littermate mice (2 x biological replicates)

2012-05-13 | E-GEOD-31667 | biostudies-arrayexpress

Gene expression of the pigmented and non-pigmented epithelia of the ciliary body of human healthy eyes

Project description:The ciliary body (CB) of the human eye consists of the non-pigmented (NPE) and pigmented (PE) neuro-epithelia. We investigated the gene expression of the NPE and PE, to shed light on the molecular mechanisms underlying the most important functions of the CB. Therefore we isolated NPE and PE cells from seven healthy human donor eyes using laser dissection microscopy. Next, we performed RNA isolation, amplification, labeling and hybridization against 44k Agilent microarrays. We performed the microarrays against a common reference sample, namely human RPE/choroid RNA. We performed 7 replicates of PE samples from 7 different donors and 7 NPE replicates from the same 7 different donors.

2012-09-18 | E-GEOD-37957 | biostudies-arrayexpress

SF3B1 association with chromatin determines splicing outcomes

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2015-04-22 | E-GEOD-65644 | biostudies-arrayexpress

HP1 is involved in regulating the global impact of DNA methylation on alternative splicing

Project description:The global impact of DNA methylation on alternative splicing is largely unknown. Using a genome-wide approach in wild-type and methylation-deficient embryonic stem cells, we found that DNA methylation can act both as an enhancer and as a silencer of splicing, and affects the splicing of more than 20% of alternative exons. These exons are characterized by distinct genetic and epigenetic signatures. Alternative splicing regulation of a subset of these exons can be explained by Heterochromatin protein 1 (HP1), which silences or enhances exon recognition in a position-dependent manner. We constructed an experimental system using site-specific targeting of a methylated/unmethylated gene, and demonstrate a direct causal relationship between DNA methylation and alternative splicing. HP1 regulates this geneM-bM-^@M-^Ys alternative splicing in a methylation-dependent manner by recruiting splicing factors to its methylated form. Our results demonstrate DNA methylation's significant global influence on mRNA splicing, and identify a specific mechanism of splicing regulation mediated by HP1. BS-seq on WT mouse ES cells (2 replicates), MNase-seq on WT and TKO cells (3 replicates), mRNA-seq on WT and TKO cells as well as HP1 knock-down cells (2 replicates for each sample)

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