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  1. Article ; Online: Combined transcriptomics and proteomics unveil the impact of vitamin C in modulating specific protein abundance in the mouse liver.

    Aumailley, Lucie / Bodein, Antoine / Adjibade, Pauline / Leclercq, Mickaël / Bourassa, Sylvie / Droit, Arnaud / Mazroui, Rachid / Lebel, Michel

    Biological research

    2024  Volume 57, Issue 1, Page(s) 26

    Abstract: Background: Vitamin C (ascorbate) is a water-soluble antioxidant and an important cofactor for various biosynthetic and regulatory enzymes. Mice can synthesize vitamin C thanks to the key enzyme gulonolactone oxidase (Gulo) unlike humans. In the current ...

    Abstract Background: Vitamin C (ascorbate) is a water-soluble antioxidant and an important cofactor for various biosynthetic and regulatory enzymes. Mice can synthesize vitamin C thanks to the key enzyme gulonolactone oxidase (Gulo) unlike humans. In the current investigation, we used Gulo
    Results: Principal component analyses revealed distinctive differences in the mRNA and protein profiles as a function of sex between all the mouse cohorts. Despite such sexual dimorphism, Spearman analyses of transcriptomics data from females and males revealed correlations of hepatic ascorbate levels with transcripts encoding a wide array of biological processes involved in glucose and lipid metabolisms as well as in the acute-phase immune response. Moreover, integration of the proteomics data showed that ascorbate modulates the abundance of various enzymes involved in lipid, xenobiotic, organic acid, acetyl-CoA, and steroid metabolism mainly at the transcriptional level, especially in females. However, several proteins of the mitochondrial complex III significantly correlated with ascorbate concentrations in both males and females unlike their corresponding transcripts. Finally, poly(ribo)some profiling did not reveal significant enrichment difference for these mitochondrial complex III mRNAs between Gulo
    Conclusions: Thus, the abundance of several subunits of the mitochondrial complex III are regulated by ascorbate at the post-transcriptional levels. Our extensive omics analyses provide a novel resource of altered gene expression patterns at the transcriptional and post-transcriptional levels under ascorbate deficiency.
    MeSH term(s) Animals ; Ascorbic Acid/metabolism ; Liver/metabolism ; Liver/drug effects ; Female ; Male ; Proteomics ; Mice ; L-Gulonolactone Oxidase/genetics ; L-Gulonolactone Oxidase/metabolism ; Gene Expression Profiling ; Transcriptome ; Principal Component Analysis ; Antioxidants/metabolism
    Chemical Substances Ascorbic Acid (PQ6CK8PD0R) ; L-Gulonolactone Oxidase (EC 1.1.3.8) ; Antioxidants
    Language English
    Publishing date 2024-05-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 1138990-4
    ISSN 0717-6287 ; 0716-9760
    ISSN (online) 0717-6287
    ISSN 0716-9760
    DOI 10.1186/s40659-024-00509-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Identification of Nuclear FMRP Isoform Iso6 Partners.

    Ledoux, Nassim / Lelong, Emeline I J / Simard, Alexandre / Hussein, Samer / Adjibade, Pauline / Lambert, Jean-Philippe / Mazroui, Rachid

    Cells

    2023  Volume 12, Issue 24

    Abstract: A deficiency of FMRP, a canonical RNA-binding protein, causes the development of Fragile X Syndrome (FXS), which is characterised by multiple phenotypes, including neurodevelopmental disorders, intellectual disability, and autism. Due to the alternative ... ...

    Abstract A deficiency of FMRP, a canonical RNA-binding protein, causes the development of Fragile X Syndrome (FXS), which is characterised by multiple phenotypes, including neurodevelopmental disorders, intellectual disability, and autism. Due to the alternative splicing of the encoding
    MeSH term(s) Fragile X Mental Retardation Protein/genetics ; Proteasome Endopeptidase Complex/metabolism ; Protein Isoforms/metabolism ; Alternative Splicing ; DNA/metabolism
    Chemical Substances Fragile X Mental Retardation Protein (139135-51-6) ; Proteasome Endopeptidase Complex (EC 3.4.25.1) ; Protein Isoforms ; DNA (9007-49-2)
    Language English
    Publishing date 2023-12-09
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells12242807
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Control of mRNA turnover: implication of cytoplasmic RNA granules.

    Adjibade, Pauline / Mazroui, Rachid

    Seminars in cell & developmental biology

    2014  Volume 34, Page(s) 15–23

    Abstract: The control of mRNA turnover is essential for the cell to rationalize its mRNA content both under physiological conditions and upon stress. Several mechanisms involved in the control of mRNA turnover have been elucidated. These include surveillance ... ...

    Abstract The control of mRNA turnover is essential for the cell to rationalize its mRNA content both under physiological conditions and upon stress. Several mechanisms involved in the control of mRNA turnover have been elucidated. These include surveillance mechanisms such as nonsense-mediated decay, non-stop mediated decay and non-go-mediated decay that eliminate aberrant mRNAs, and regulatory mechanisms including AU-mediated decay, GU-mediated decay, and CDE-mediated decay that ensure mRNA plasticity. In general, the mechanisms of RNA decay rely on interactions between specific cis-acting RNA elements and selected RNA-binding proteins that either prevent the degradation of mRNA targets or induce the recruitment of decaying effectors leading to mRNA degradation. Formation of cytoplasmic RNA granules including processing bodies, stress granules, UV granules, and exosome granules have recently emerged as an additional mechanism that control mRNA turnover of selected mRNAs. Here we will review briefly review the main mechanisms that control mRNA decay and highlight possible implication of RNA granules in such mechanisms.
    MeSH term(s) Animals ; Cytoplasmic Granules/metabolism ; Gene Expression Regulation ; Humans ; RNA Stability ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; RNA-Binding Proteins/physiology ; Stress, Physiological
    Chemical Substances RNA, Messenger ; RNA-Binding Proteins
    Language English
    Publishing date 2014-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1312473-0
    ISSN 1096-3634 ; 1084-9521
    ISSN (online) 1096-3634
    ISSN 1084-9521
    DOI 10.1016/j.semcdb.2014.05.013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Prostate cancer resistance leads to a global deregulation of translation factors and unconventional translation.

    Lelong, Emeline I J / Khelifi, Gabriel / Adjibade, Pauline / Joncas, France-Hélène / Grenier St-Sauveur, Valérie / Paquette, Virginie / Gris, Typhaine / Zoubeidi, Amina / Audet-Walsh, Etienne / Lambert, Jean-Philippe / Toren, Paul / Mazroui, Rachid / Hussein, Samer M I

    NAR cancer

    2022  Volume 4, Issue 4, Page(s) zcac034

    Abstract: Emerging evidence associates translation factors and regulators to tumorigenesis. However, our understanding of translational changes in cancer resistance is still limited. Here, we generated an enzalutamide-resistant prostate cancer (PCa) model, which ... ...

    Abstract Emerging evidence associates translation factors and regulators to tumorigenesis. However, our understanding of translational changes in cancer resistance is still limited. Here, we generated an enzalutamide-resistant prostate cancer (PCa) model, which recapitulated key features of clinical enzalutamide-resistant PCa. Using this model and poly(ribo)some profiling, we investigated global translation changes that occur during acquisition of PCa resistance. We found that enzalutamide-resistant cells exhibit an overall decrease in mRNA translation with a specific deregulation in the abundance of proteins involved in mitochondrial processes and in translational regulation. However, several mRNAs escape this translational downregulation and are nonetheless bound to heavy polysomes in enzalutamide-resistant cells suggesting active translation. Moreover, expressing these corresponding genes in enzalutamide-sensitive cells promotes resistance to enzalutamide treatment. We also found increased association of long non-coding RNAs (lncRNAs) with heavy polysomes in enzalutamide-resistant cells, suggesting that some lncRNAs are actively translated during enzalutamide resistance. Consistent with these findings, expressing the predicted coding sequences of known lncRNAs
    Language English
    Publishing date 2022-11-04
    Publishing country England
    Document type Journal Article
    ISSN 2632-8674
    ISSN (online) 2632-8674
    DOI 10.1093/narcan/zcac034
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Treatment of cancer cells with Lapatinib negatively regulates general translation and induces stress granules formation.

    Adjibade, Pauline / Simoneau, Bryan / Ledoux, Nassim / Gauthier, William-Naud / Nkurunziza, Melisse / Khandjian, Edouard W / Mazroui, Rachid

    PloS one

    2020  Volume 15, Issue 5, Page(s) e0231894

    Abstract: Stress granules (SG) are cytoplasmic RNA granules that form during various types of stress known to inhibit general translation, including oxidative stress, hypoxia, endoplasmic reticulum stress (ER), ionizing radiations or viral infection. Induction of ... ...

    Abstract Stress granules (SG) are cytoplasmic RNA granules that form during various types of stress known to inhibit general translation, including oxidative stress, hypoxia, endoplasmic reticulum stress (ER), ionizing radiations or viral infection. Induction of these SG promotes cell survival in part through sequestration of proapoptotic molecules, resulting in the inactivation of cell death pathways. SG also form in cancer cells, but studies investigating their formation upon treatment with chemotherapeutics are very limited. Here we identified Lapatinib (Tykerb / Tyverb®), a tyrosine kinase inhibitor used for the treatment of breast cancers as a new inducer of SG in breast cancer cells. Lapatinib-induced SG formation correlates with the inhibition of general translation initiation which involves the phosphorylation of the translation initiation factor eIF2α through the kinase PERK. Disrupting PERK-SG formation by PERK depletion experiments sensitizes resistant breast cancer cells to Lapatinib. This study further supports the assumption that treatment with anticancer drugs activates the SG pathway, which may constitute an intrinsic stress response used by cancer cells to resist treatment.
    MeSH term(s) Cell Line, Tumor ; Cytoplasmic Granules/drug effects ; Cytoplasmic Granules/metabolism ; Cytoplasmic Granules/pathology ; Drug Resistance, Neoplasm/drug effects ; Drug Resistance, Neoplasm/genetics ; Endoplasmic Reticulum Stress/drug effects ; Endoplasmic Reticulum Stress/genetics ; Eukaryotic Initiation Factor-2/metabolism ; Humans ; Lapatinib/pharmacology ; Lapatinib/therapeutic use ; MCF-7 Cells ; Neoplasms/drug therapy ; Neoplasms/genetics ; Neoplasms/metabolism ; Neoplasms/pathology ; Phosphorylation/drug effects ; Protein Biosynthesis/drug effects ; Up-Regulation/drug effects ; Up-Regulation/genetics ; eIF-2 Kinase/metabolism
    Chemical Substances Eukaryotic Initiation Factor-2 ; Lapatinib (0VUA21238F) ; PERK kinase (EC 2.7.11.1) ; eIF-2 Kinase (EC 2.7.11.1)
    Language English
    Publishing date 2020-05-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0231894
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Analysis of translation initiation during stress conditions by polysome profiling

    Coudert, Laëtitia / Adjibade, Pauline / Mazroui, Rachid

    Journal of visualized experiments. 2014 May 19, , no. 87

    2014  

    Abstract: Precise control of mRNA translation is fundamental for eukaryotic cell homeostasis, particularly in response to physiological and pathological stress. Alterations of this program can lead to the growth of damaged cells, a hallmark of cancer development, ... ...

    Abstract Precise control of mRNA translation is fundamental for eukaryotic cell homeostasis, particularly in response to physiological and pathological stress. Alterations of this program can lead to the growth of damaged cells, a hallmark of cancer development, or to premature cell death such as seen in neurodegenerative diseases. Much of what is known concerning the molecular basis for translational control has been obtained from polysome analysis using a density gradient fractionation system. This technique relies on ultracentrifugation of cytoplasmic extracts on a linear sucrose gradient. Once the spin is completed, the system allows fractionation and quantification of centrifuged zones corresponding to different translating ribosomes populations, thus resulting in a polysome profile. Changes in the polysome profile are indicative of changes or defects in translation initiation that occur in response to various types of stress. This technique also allows to assess the role of specific proteins on translation initiation, and to measure translational activity of specific mRNAs. Here we describe our protocol to perform polysome profiles in order to assess translation initiation of eukaryotic cells and tissues under either normal or stress growth conditions.
    Keywords carcinogenesis ; cell death ; eukaryotic cells ; fractionation ; homeostasis ; messenger RNA ; neoplasms ; neurodegenerative diseases ; proteins ; ribosomes ; sucrose ; tissues ; translation (genetics) ; ultracentrifugation
    Language English
    Dates of publication 2014-0519
    Size p. e51164.
    Publishing place Journal of Visualized Experiments
    Document type Article
    ZDB-ID 2259946-0
    ISSN 1940-087X
    ISSN 1940-087X
    DOI 10.3791/51164
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Analysis of translation initiation during stress conditions by polysome profiling.

    Coudert, Laëtitia / Adjibade, Pauline / Mazroui, Rachid

    Journal of visualized experiments : JoVE

    2014  , Issue 87

    Abstract: Precise control of mRNA translation is fundamental for eukaryotic cell homeostasis, particularly in response to physiological and pathological stress. Alterations of this program can lead to the growth of damaged cells, a hallmark of cancer development, ... ...

    Abstract Precise control of mRNA translation is fundamental for eukaryotic cell homeostasis, particularly in response to physiological and pathological stress. Alterations of this program can lead to the growth of damaged cells, a hallmark of cancer development, or to premature cell death such as seen in neurodegenerative diseases. Much of what is known concerning the molecular basis for translational control has been obtained from polysome analysis using a density gradient fractionation system. This technique relies on ultracentrifugation of cytoplasmic extracts on a linear sucrose gradient. Once the spin is completed, the system allows fractionation and quantification of centrifuged zones corresponding to different translating ribosomes populations, thus resulting in a polysome profile. Changes in the polysome profile are indicative of changes or defects in translation initiation that occur in response to various types of stress. This technique also allows to assess the role of specific proteins on translation initiation, and to measure translational activity of specific mRNAs. Here we describe our protocol to perform polysome profiles in order to assess translation initiation of eukaryotic cells and tissues under either normal or stress growth conditions.
    MeSH term(s) Animals ; Centrifugation, Density Gradient/methods ; Drosophila ; HeLa Cells ; Humans ; Mice ; Peptide Chain Initiation, Translational ; Polyribosomes/chemistry ; Polyribosomes/genetics ; RNA, Messenger/genetics ; RNA, Messenger/isolation & purification ; Ribosomes/chemistry ; Ribosomes/genetics ; Stress, Physiological/genetics
    Chemical Substances RNA, Messenger
    Language English
    Publishing date 2014-05-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Video-Audio Media
    ZDB-ID 2259946-0
    ISSN 1940-087X ; 1940-087X
    ISSN (online) 1940-087X
    ISSN 1940-087X
    DOI 10.3791/51164
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Rôle de l'heme regulated inhibitor (HRI) dans la résistance à l'apoptose.

    Joncas, France-Hélène / Adjibade, Pauline / Mazroui, Rachid

    Medecine sciences : M/S

    2014  Volume 30, Issue 10, Page(s) 882–888

    Abstract: When exposed to environmental stresses, cells activate defence mechanisms to adapt stress and inhibit apoptotic pathways leading to their survival. Stressed cells also reduce their general metabolism in part by inhibiting mRNA translation, thereby saving ...

    Title translation Role of HRI in apoptosis resistance.
    Abstract When exposed to environmental stresses, cells activate defence mechanisms to adapt stress and inhibit apoptotic pathways leading to their survival. Stressed cells also reduce their general metabolism in part by inhibiting mRNA translation, thereby saving energy needed to repair stress-induced damages. Under stress conditions, the inhibition of mRNA translation occurs mainly at its initiation step through the phosphorylation of the translation initiation factor eIF2α. One of the four kinases known to phosphorylate eIF2α is heme-regulated inhibitor (HRI). The activation of HRI occurs under conditions of heme deficiency, oxidative stress and treatment with anti-cancer drugs such as proteasome inhibitors. In this article, we discuss the role of HRI in promoting cell resistance to stress-mediated apoptosis.
    MeSH term(s) Animals ; Apoptosis/genetics ; Cytoplasmic Granules/metabolism ; Erythroblasts/physiology ; Heme/physiology ; Humans ; Oxidative Stress/physiology ; Protein Biosynthesis/genetics ; Stress, Physiological/physiology ; eIF-2 Kinase/physiology
    Chemical Substances Heme (42VZT0U6YR) ; eIF-2 Kinase (EC 2.7.11.1)
    Language French
    Publishing date 2014-10
    Publishing country France
    Document type English Abstract ; Journal Article ; Review
    ZDB-ID 632733-3
    ISSN 1958-5381 ; 0767-0974
    ISSN (online) 1958-5381
    ISSN 0767-0974
    DOI 10.1051/medsci/20143010015
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: The RabGAP TBC-11 controls Argonaute localization for proper microRNA function in C. elegans.

    Michaud, Pascale / Shah, Vivek Nilesh / Adjibade, Pauline / Houle, Francois / Quévillon Huberdeau, Miguel / Rioux, Rachel / Lavoie-Ouellet, Camille / Gu, Weifeng / Mazroui, Rachid / Simard, Martin J

    PLoS genetics

    2021  Volume 17, Issue 4, Page(s) e1009511

    Abstract: Once loaded onto Argonaute proteins, microRNAs form a silencing complex called miRISC that targets mostly the 3'UTR of mRNAs to silence their translation. How microRNAs are transported to and from their target mRNA remains poorly characterized. While ... ...

    Abstract Once loaded onto Argonaute proteins, microRNAs form a silencing complex called miRISC that targets mostly the 3'UTR of mRNAs to silence their translation. How microRNAs are transported to and from their target mRNA remains poorly characterized. While some reports linked intracellular trafficking to microRNA activity, it is still unclear how these pathways coordinate for proper microRNA-mediated gene silencing and turnover. Through a forward genetic screen using Caenorhabditis elegans, we identified the RabGAP tbc-11 as an important factor for the microRNA pathway. We show that TBC-11 acts mainly through the small GTPase RAB-6 and that its regulation is required for microRNA function. The absence of functional TBC-11 increases the pool of microRNA-unloaded Argonaute ALG-1 that is likely associated to endomembranes. Furthermore, in this condition, this pool of Argonaute accumulates in a perinuclear region and forms a high molecular weight complex. Altogether, our data suggest that the alteration of TBC-11 generates a fraction of ALG-1 that cannot bind to target mRNAs, leading to defective gene repression. Our results establish the importance of intracellular trafficking for microRNA function and demonstrate the involvement of a small GTPase and its GAP in proper Argonaute localization in vivo.
    MeSH term(s) 3' Untranslated Regions/genetics ; Animals ; Caenorhabditis elegans/genetics ; Caenorhabditis elegans Proteins/genetics ; Gene Expression Regulation, Developmental/genetics ; Gene Silencing ; MicroRNAs/genetics ; Protein Biosynthesis ; RNA, Messenger/genetics ; RNA-Binding Proteins/genetics ; rab GTP-Binding Proteins/genetics
    Chemical Substances 3' Untranslated Regions ; ALG-1 protein, C elegans ; Caenorhabditis elegans Proteins ; MicroRNAs ; RNA, Messenger ; RNA-Binding Proteins ; rab GTP-Binding Proteins (EC 3.6.5.2)
    Language English
    Publishing date 2021-04-07
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2186725-2
    ISSN 1553-7404 ; 1553-7390
    ISSN (online) 1553-7404
    ISSN 1553-7390
    DOI 10.1371/journal.pgen.1009511
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: The chemotherapeutic agent bortezomib induces the formation of stress granules

    Gareau Cristina / Fournier Marie-Josée / Mazroui Rachid

    Cancer Cell International, Vol 10, Iss 1, p

    2010  Volume 12

    Abstract: Abstract Background Cytoplasmic stress granules (SGs) are specialized storage sites of untranslated mRNAs whose formation occurs under different stress conditions and is often associated with cell survival. SGs-inducing stresses include radiations, ... ...

    Abstract Abstract Background Cytoplasmic stress granules (SGs) are specialized storage sites of untranslated mRNAs whose formation occurs under different stress conditions and is often associated with cell survival. SGs-inducing stresses include radiations, hypoxia, viral infections, and chemical inhibitors of specific translation initiation factors. The FDA-approved drug bortezomib (Velcade ® ) is a peptide boronate inhibitor of the 26S proteasome that is very efficient for the treatment of myelomas and other hematological tumors. Solid tumors are largely refractory to bortezomib. In the present study, we investigated the formation of SGs following bortezomib treatment. Results We show that bortezomib efficiently induces the formation of SGs in cancer cells. This process involves the phosphorylation of translation initiation factor eIF2α by heme-regulated inhibitor kinase (HRI). Depletion of HRI prevents bortezomib-induced formation of SGs and promotes apoptosis. Conclusions This is the first study describing the formation of SGs by a chemotherapeutic compound. We speculate that the activation of HRI and the formation of SGs might constitute a mechanism by which cancer cells resist bortezomib-mediated apoptosis.
    Keywords Neoplasms. Tumors. Oncology. Including cancer and carcinogens ; RC254-282 ; Internal medicine ; RC31-1245 ; Medicine ; R ; DOAJ:Oncology ; DOAJ:Medicine (General) ; DOAJ:Health Sciences
    Language English
    Publishing date 2010-04-01T00:00:00Z
    Publisher BioMed Central
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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