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5-Fluorouracil Treatment Represses Pseudouridine-Containing miRNA Export into Extracellular Vesicles (RNA-seq)

ABSTRACT: 5-Fluorouracil (5-FU) has been used for chemotherapy for colorectal and other cancers for over 50 years. The prevailing view of its mechanism of action is inhibition of thymidine synthase leading to defects in DNA replication and repair. However, 5-FU is also incorporated into RNA causing defects in RNA metabolism, inhibition of pseudouridine modification, and altered ribosome function. We examined the impact of 5-FU on the expression and export of small RNAs into small extracellular vesicles (sEVs) and regulation of post-transcriptional small RNA modifications (PTxMs). EVs are secreted by all cells and contain a variety of proteins and RNAs that can function in cell-cell communication. PTxMs on cellular and extracellular small RNAs provide yet another layer of gene regulation. We found that treatment of colorectal cancer (CRC) cells with 5-FU represses sEV export of miRNA and snRNA-derived RNAs, but promotes export of snoRNA-derived RNAs. Strikingly, 5-FU treatment significantly decreased the levels of pseudouridine on both cellular and sEV small RNA profiles. In contrast, 5-FU exposure led to increased levels of cellular small RNAs containing a variety of methyl-modified bases. Our results suggest that 5-FU exposure leads to altered expression, base modification, and mislocalization of sEV small RNAs.

ORGANISM(S): Homo sapiens

PROVIDER: GSE255875 | GEO | 2024/09/18

REPOSITORIES: GEO

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5-Fluorouracil Treatment Represses Pseudouridine-Containing miRNA Export into Extracellular Vesicles (smallRNA seq)

Project description:5-Fluorouracil (5-FU) has been used for chemotherapy for colorectal and other cancers for over 50 years. The prevailing view of its mechanism of action is inhibition of thymidine synthase leading to defects in DNA replication and repair. However, 5-FU is also incorporated into RNA causing defects in RNA metabolism, inhibition of pseudouridine modification, and altered ribosome function. We examined the impact of 5-FU on the expression and export of small RNAs into small extracellular vesicles (sEVs) and regulation of post-transcriptional small RNA modifications (PTxMs). EVs are secreted by all cells and contain a variety of proteins and RNAs that can function in cell-cell communication. PTxMs on cellular and extracellular small RNAs provide yet another layer of gene regulation. We found that treatment of colorectal cancer (CRC) cells with 5-FU represses sEV export of miRNA and snRNA-derived RNAs, but promotes export of snoRNA-derived RNAs. Strikingly, 5-FU treatment significantly decreased the levels of pseudouridine on both cellular and sEV small RNA profiles. In contrast, 5-FU exposure led to increased levels of cellular small RNAs containing a variety of methyl-modified bases. Our results suggest that 5-FU exposure leads to altered expression, base modification, and mislocalization of sEV small RNAs.

2024-09-18 | GSE255876 | GEO

Pseudouridine in small RNAs

Project description:Pseudouridine in small RNAs

| PRJNA958093 | ENA

Project description:Pseudouridine in small RNAs

| PRJNA917260 | ENA

Pseudouridine guides small RNA transport and inheritance via Exportin-t

Project description:Pseudouridine (Ψ) is an isomer of uridine found in ribosomal, transfer and other structural RNAs as well as in some mRNAs and non-coding RNAs, but is difficult to detect in short RNA sequences. Using modified techniques we found Ψ in microRNAs (miRNAs) and their precursors from mammalian and plant cells, primarily at the 5ʹ terminus of the mature miRNA. Small RNAs targeting transposons in reproductive cells (piRNA in testis and easiRNA in pollen) were highly enriched for Ψ, indicating a potential role in epigenetic inheritance. In pollen, pseudouridylated small RNAs were produced by RNA polymerase IV and were localized to sperm cells, as were miRNAs with terminal Ψ. We show that pseudouridylated easiRNAs from pollen contribute to imprinting and the triploid block (chromosome dosage-dependent epigenetic lethality) via the activity of PAUSED/HEN5, the plant homolog of Exportin-t. Exportin-t is required for nuclear export of pseudouridylated tRNA, and we found that PSD is required for cell-cell transport of small RNA in the germline.

2023-08-07 | GSE229986 | GEO

Role of miR-19b and its target mRNAs on 5-fluorouracil resistance in colon cancer cells

Project description:Despite the efforts in defining the molecular mechanisms for the drug resistance in colorectal cancers, little is known about the roles of microRNAs. With microarray containing 723 microRNAs, we examined effect of 5-fluorouracil (5-FU) on the microRNA expression. Respond to 5-FU, we identify two microRNAs, miR-19b and miR-21, that were differentially expressed in 5-FU resistant colon cancer cells derived from KM12C and DLD-1. DLD-1, DLD-1/R, KM12C, and KM12C/R cells were plated at 1 × 105 cells/well. After pre-culture, cells were treated with 60 uM of 5-FU for 72 h. This was the same condition as the analysis of cell cycle. RNAs were collected before (0 h) and after the treatment of 5-FU (72 h).

2011-07-26 | E-GEOD-30894 | biostudies-arrayexpress

Translational reprogramming of colorectal cancer cells induced by 5-fluorouracil through a miRNA-dependent mechanism

Project description:5-Fluorouracil (5-FU) is a widely used chemotherapeutic drug in colorectal cancer. Previous studies showed that 5-FU modulates RNA metabolism and mRNA expression. In addition, it has been reported that 5-FU incorporates into the RNAs constituting the translational machinery and that 5-FU affects the amount of some mRNAs associated with ribosomes. However, the impact of 5-FU on translational regulation remains unclear. Using translatome profiling, we report that a clinically relevant dose of 5-FU induces a translational reprogramming in colorectal cancer cell lines. Comparison of mRNA distribution between polysomal and non-polysomal fractions in response to 5-FU treatment using microarray quantification identified 313 genes whose translation was selectively regulated. These regulations were mostly stimulatory (91%). Among these genes, we showed that 5-FU increases the mRNA translation of HIVEP2, which encodes a transcription factor whose translation in normal condition is known to be inhibited by mir-155. In response to 5-FU, the expression of mir-155 decreases thus stimulating the translation of HIVEP2 mRNA. Interestingly, the 5-FU-induced increase in specific mRNA translation was associated with reduction of global protein synthesis. Altogether, these findings indicate that 5-FU promotes a translational reprogramming leading to the increased translation of a subset of mRNAs that involves at least for some of them, miRNA-dependent mechanisms. This study supports a still poorly evaluated role of translational control in drug response.

2017-05-23 | GSE77180 | GEO

Alteration of ribosome function upon 5-fluorouracil treatment favours cancer cell drug-tolerance

Project description:Partial response to chemotherapy leads to disease resurgence. Upon treatment, a subpopulation of cancer cells, called drug-tolerant persistent cells, displays a transitory drug tolerance that lead to treatment resistance. Though drug-tolerance mechanisms remain poorly known, they have been linked to non-genomic processes, including epigenetics, stemness and dormancy. 5-fluorouracil (5-FU), the most widely used chemotherapy in cancer treatment, is associated with resistance. While prescribed as an inhibitor of DNA replication, 5-FU alters all RNA pathways. Here, we show that 5-FU treatment leads to the unexpected production of fluorinated ribosomes, exhibiting altered mRNA translation. 5-FU is incorporated into ribosomal RNAs of mature ribosomes in cancer cell lines, colorectal xenografts, and human tumors. Fluorinated ribosomes appear to be functional, yet, they display a selective translational activity towards mRNAs according to the nature of their 5'-untranslated region. As a result, we found that sustained translation of IGF-1R mRNA, which codes for one of the most potent cell survival effectors, promoted the survival of 5-FU-treated colorectal cancer cells. Altogether, our results demonstrate that "man-made" fluorinated ribosomes favour the drug-tolerant cellular phenotype by promoting translation of survival genes. This could be exploited for developing novel combined therapies. By unraveling translation regulation as a novel gene expression mechanism helping cells to survive a drug-challenge, our study extends the spectrum of molecular mechanisms driving drug-tolerance.

2021-06-25 | GSE178839 | GEO

A heterochromatin specific RNA export pathway facilitates piRNA production

Project description:PIWI-interacting RNAs (piRNAs), a class of small RNAs that guide transposon silencing in animals, are processed in the cytoplasm from RNA Polymerase II transcripts. How piRNA precursors, which often lack RNA maturation signatures and thereby violate quality control checkpoints, achieve nuclear export is unknown. Here, we uncover a germline-specific RNA export pathway in Drosophila, that escorts piRNA precursors from their heterochromatic origins to nuage, the cytoplasmic piRNA processing centres. This pathway connects canonical nuclear export factors—the RNA helicase UAP56, the NXF cofactor Nxt1/p15, and the exportin Crm1/Xpo1—with Nxf3, a variant of the mRNA exporter Nxf1/Tap. Nxf3 recruitment to nascent piRNA precursors occurs via the heterochromatin protein 1-variant Rhino and CG13741/Bootlegger, a new piRNA pathway factor, thereby making piRNA precursor export independent of RNA processing events. Thus, similar to retroviral hijacking of cellular export factors, piRNA precursor export evolved to bend canonical gene expression rules through bypassing nuclear RNA surveillance mechanisms.

2019-03-29 | PXD012717 | Pride

Identification of novel SNP candidates associated with chemo-responsiveness in colorectal cancers

Project description:Identificaiton of novel single-nucleotide polymorphism (SNP) candidates associated with chemo-responsiveness in colorectal cancers using microarray Response rates of 104 colorectal cancer patients to established regiments (FL, CAPE, FLOX, FLIRI) were evaluated by histoculture drug response assay. Affymetrix SNP 5.0 chips were used to determine genotypes of the same colorectal cancer patients. SNPs associated with chemosensitivity to standard regimens were identified by genome-wide association study. FL: 5-FU + Leucovorin; CA: Capecitabine, FLOX: 5-FU + Leucovorin + Oxaliplatin, FLIRI: 5-FU + Leucovorin + Irinotecan

2010-06-01 | GSE16718 | GEO

Knockout of Pseudouridine synthase 1 (PUS1) in mice. [Kidney]

Project description:In an effort to produce a mouse model of Mitochondrial Myopathy with Lactic acidosis and Sideroblastic Anemia (MLASA), we knocked out the gene for Pseudouridine synthase 1 (PUS1), an enzyme that modifies uridine to pseudouridine in many cytoplasmic and mitochondrial tRNAs, as well as other cellular RNAs. The Pus1-/- mice are viable, are born at the expected Mendelian frequency, and are non-dysmorphic. The PUS1 mRNA and certain pseudouridine modifications are absent in cytoplasmic and mitochondrial tRNAs in the Pus1-/- mice. The Pus1-/- mice display reduce exercise capacity at 14 weeks, with alterations in muscle morphology, histology, and physiology. Red gastrocnemius muscle from Pus1-/- mice shows reduced number and size of mitochondria and reduced Cytochrome C oxidase activity. Two-condition, two-color experiment: Mouse wild type PUS1 and homozygous mutant PUS1 kidney tissue samples: 4 biological replicates each.

2016-05-16 | E-GEOD-77819 | biostudies-arrayexpress

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