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  1. AU="Gallouzi, Imed-Eddine"
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  1. Article: The senescence-associated secretory phenotype as a driver of tumor growth: does G3BP1 hold the key?

    Omer, Amr / Di Marco, Sergio / Gallouzi, Imed-Eddine

    Molecular & cellular oncology

    2021  Volume 8, Issue 1, Page(s) 1850161

    Abstract: Cellular senescence is a double-edged sword that, depending on the context, acts as either a potent tumor protective mechanism or an age-related driver of diseases such as cancer. Our recent findings show that the rasGAP SH3-binding protein 1 (G3BP1) ... ...

    Abstract Cellular senescence is a double-edged sword that, depending on the context, acts as either a potent tumor protective mechanism or an age-related driver of diseases such as cancer. Our recent findings show that the rasGAP SH3-binding protein 1 (G3BP1) activates the senescent-associated secretory phenotype (SASP) that, in turn, mediates cancer growth/progression.
    Language English
    Publishing date 2021-01-11
    Publishing country United States
    Document type Journal Article
    ISSN 2372-3556
    ISSN 2372-3556
    DOI 10.1080/23723556.2020.1850161
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: pADP-ribosylation regulates the cytoplasmic localization, cleavage, and pro-apoptotic function of HuR.

    Ashour, Kholoud / Sali, Sujitha / Aldoukhi, Ali H / Hall, Derek / Mubaid, Souad / Busque, Sandrine / Lian, Xian Jin / Gagné, Jean-Philippe / Khattak, Shahryar / Di Marco, Sergio / Poirier, Guy G / Gallouzi, Imed-Eddine

    Life science alliance

    2024  Volume 7, Issue 6

    Abstract: HuR (ElavL1) is one of the main post-transcriptional regulators that determines cell fate. Although the role of HuR in apoptosis is well established, the post-translational modifications that govern this function remain elusive. In this study, we show ... ...

    Abstract HuR (ElavL1) is one of the main post-transcriptional regulators that determines cell fate. Although the role of HuR in apoptosis is well established, the post-translational modifications that govern this function remain elusive. In this study, we show that PARP1/2-mediated poly(ADP)-ribosylation (PARylation) is instrumental in the pro-apoptotic function of HuR. During apoptosis, a substantial reduction in HuR PARylation is observed. This results in the cytoplasmic accumulation and the cleavage of HuR, both of which are essential events for apoptosis. These effects are mediated by a pADP-ribose-binding motif within the HuR-HNS region (HuR PAR-binding site). Under normal conditions, the association of the HuR PAR-binding site with pADP-ribose is responsible for the nuclear retention of HuR. Mutations within this motif prevent the binding of HuR to its import factor TRN2, leading to its cytoplasmic accumulation and cleavage. Collectively, our findings underscore the role of PARylation in controlling the pro-apoptotic function of HuR, offering insight into the mechanism by which PARP1/2 enzymes regulate cell fate and adaptation to various assaults.
    MeSH term(s) Ribose ; Protein Processing, Post-Translational ; Mutation ; Cell Differentiation ; Protein Domains
    Chemical Substances Ribose (681HV46001)
    Language English
    Publishing date 2024-03-27
    Publishing country United States
    Document type Journal Article
    ISSN 2575-1077
    ISSN (online) 2575-1077
    DOI 10.26508/lsa.202302316
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Could stress granules be involved in age-related diseases?

    Gallouzi, Imed-Eddine

    Aging

    2009  Volume 1, Issue 9, Page(s) 753–757

    MeSH term(s) Aging/physiology ; Animals ; Cellular Senescence/physiology ; Cyclin-Dependent Kinase Inhibitor p21/metabolism ; Cytoplasmic Granules/physiology ; Disease/etiology ; Eukaryotic Initiation Factor-2/metabolism ; HSP70 Heat-Shock Proteins/metabolism ; Humans ; Models, Biological ; Neoplasms/etiology ; Neoplasms/pathology ; Neoplasms/physiopathology ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; Stress, Physiological/physiology
    Chemical Substances Cyclin-Dependent Kinase Inhibitor p21 ; Eukaryotic Initiation Factor-2 ; HSP70 Heat-Shock Proteins ; RNA, Messenger
    Language English
    Publishing date 2009-09-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1945-4589
    ISSN (online) 1945-4589
    DOI 10.18632/aging.100090
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: The formation of HuR/YB1 complex is required for the stabilization of target mRNA to promote myogenesis.

    Sánchez, Brenda Janice / Mubaid, Souad / Busque, Sandrine / de Los Santos, Yossef Lopez / Ashour, Kholoud / Sadek, Jason / Lian, Xian Jin / Khattak, Shahryar / Di Marco, Sergio / Gallouzi, Imed-Eddine

    Nucleic acids research

    2023  Volume 51, Issue 3, Page(s) 1375–1392

    Abstract: mRNA stability is the mechanism by which cells protect transcripts allowing their expression to execute various functions that affect cell metabolism and fate. It is well-established that RNA binding proteins (RBPs) such as HuR use their ability to ... ...

    Abstract mRNA stability is the mechanism by which cells protect transcripts allowing their expression to execute various functions that affect cell metabolism and fate. It is well-established that RNA binding proteins (RBPs) such as HuR use their ability to stabilize mRNA targets to modulate vital processes such as muscle fiber formation (myogenesis). However, the machinery and the mechanisms regulating mRNA stabilization are still elusive. Here, we identified Y-Box binding protein 1 (YB1) as an indispensable HuR binding partner for mRNA stabilization and promotion of myogenesis. Both HuR and YB1 bind to 409 common mRNA targets, 147 of which contain a U-rich consensus motif in their 3' untranslated region (3'UTR) that can also be found in mRNA targets in other cell systems. YB1 and HuR form a heterodimer that associates with the U-rich consensus motif to stabilize key promyogenic mRNAs. The formation of this complex involves a small domain in HuR (227-234) that if mutated prevents HuR from reestablishing myogenesis in siHuR-treated muscle cells. Together our data uncover that YB1 is a key player in HuR-mediated stabilization of pro-myogenic mRNAs and provide the first indication that the mRNA stability mechanism is as complex as other key cellular processes such as mRNA decay and translation.
    MeSH term(s) 3' Untranslated Regions ; ELAV Proteins/genetics ; ELAV Proteins/metabolism ; ELAV-Like Protein 1/metabolism ; Muscle Development ; Muscle Fibers, Skeletal/metabolism ; RNA Stability ; RNA, Messenger/metabolism ; Cell Line ; Animals ; Mice ; Transcription Factors/metabolism
    Chemical Substances 3' Untranslated Regions ; ELAV Proteins ; ELAV-Like Protein 1 ; RNA, Messenger ; Elavl1 protein, mouse ; YB-1 protein, mouse ; Transcription Factors
    Language English
    Publishing date 2023-01-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkac1245
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Tankyrase-1 regulates RBP-mediated mRNA turnover to promote muscle fiber formation.

    Mubaid, Souad / Sanchez, Brenda Janice / Algehani, Rinad A / Skopenkova, Viktoriia / Adjibade, Pauline / Hall, Derek T / Busque, Sandrine / Lian, Xian Jin / Ashour, Kholoud / Tremblay, Anne-Marie K / Carlile, Graeme / Gagné, Jean-Philippe / Diaz-Gaxiola, Andrea / Khattak, Shahryar / Di Marco, Sergio / Thomas, David Y / Poirier, Guy G / Gallouzi, Imed-Eddine

    Nucleic acids research

    2024  Volume 52, Issue 7, Page(s) 4002–4020

    Abstract: Poly(ADP-ribosylation) (PARylation) is a post-translational modification mediated by a subset of ADP-ribosyl transferases (ARTs). Although PARylation-inhibition based therapies are considered as an avenue to combat debilitating diseases such as cancer ... ...

    Abstract Poly(ADP-ribosylation) (PARylation) is a post-translational modification mediated by a subset of ADP-ribosyl transferases (ARTs). Although PARylation-inhibition based therapies are considered as an avenue to combat debilitating diseases such as cancer and myopathies, the role of this modification in physiological processes such as cell differentiation remains unclear. Here, we show that Tankyrase1 (TNKS1), a PARylating ART, plays a major role in myogenesis, a vital process known to drive muscle fiber formation and regeneration. Although all bona fide PARPs are expressed in muscle cells, experiments using siRNA-mediated knockdown or pharmacological inhibition show that TNKS1 is the enzyme responsible of catalyzing PARylation during myogenesis. Via this activity, TNKS1 controls the turnover of mRNAs encoding myogenic regulatory factors such as nucleophosmin (NPM) and myogenin. TNKS1 mediates these effects by targeting RNA-binding proteins such as Human Antigen R (HuR). HuR harbors a conserved TNKS-binding motif (TBM), the mutation of which not only prevents the association of HuR with TNKS1 and its PARylation, but also precludes HuR from regulating the turnover of NPM and myogenin mRNAs as well as from promoting myogenesis. Therefore, our data uncover a new role for TNKS1 as a key modulator of RBP-mediated post-transcriptional events required for vital processes such as myogenesis.
    MeSH term(s) Tankyrases/metabolism ; Tankyrases/genetics ; Humans ; RNA, Messenger/metabolism ; RNA, Messenger/genetics ; Muscle Development/genetics ; Animals ; Muscle Fibers, Skeletal/metabolism ; Mice ; Myogenin/genetics ; Myogenin/metabolism ; Nucleophosmin ; ELAV-Like Protein 1/metabolism ; ELAV-Like Protein 1/genetics ; RNA Stability/genetics ; Poly ADP Ribosylation/genetics ; Cell Line ; Nuclear Proteins/metabolism ; Nuclear Proteins/genetics ; Cell Differentiation/genetics ; RNA-Binding Proteins/metabolism ; RNA-Binding Proteins/genetics ; HEK293 Cells
    Chemical Substances Tankyrases (EC 2.4.2.30) ; RNA, Messenger ; Myogenin ; Nucleophosmin (117896-08-9) ; ELAV-Like Protein 1 ; TNKS protein, human (EC 2.4.2.30) ; NPM1 protein, human ; ELAVL1 protein, human ; Nuclear Proteins ; RNA-Binding Proteins ; Tnks protein, mouse (EC 2.4.2.30)
    Language English
    Publishing date 2024-02-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkae059
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Alternative polyadenylation and the stress response.

    Sadek, Jason / Omer, Amr / Hall, Derek / Ashour, Kholoud / Gallouzi, Imed Eddine

    Wiley interdisciplinary reviews. RNA

    2019  Volume 10, Issue 5, Page(s) e1540

    Abstract: The cellular stress response is a universal mechanism necessary for the survival of all organisms. This multifaceted process is primarily driven by regulation of gene expression to produce an intracellular environment suitable for promoting cell survival ...

    Abstract The cellular stress response is a universal mechanism necessary for the survival of all organisms. This multifaceted process is primarily driven by regulation of gene expression to produce an intracellular environment suitable for promoting cell survival and recovery. Posttranscriptional regulatory events are considered as critical mechanisms that modulate core characteristics of mRNA transcripts to promote cell adaptation to various assaults. While the impact of processes such as mRNA splicing, turnover, localization, and translation on the cellular stress response has been extensively studied, recent observations highlight the role of alternative polyadenylation (APA) in response to challenges such as oxidative stress, heat shock, and starvation. The role of APA is comprehensive with far reaching effects on mRNA stability, mRNA localization, and protein coding sequences. Nonetheless, APA remains a relatively unappreciated mode of gene regulation despite its role in regulating key mediators of the stress response. The goal of this review is to provide an overview of the recent advances in our understanding of the various ways by which APA affects cell adaptation to its environment and discuss how a defect in APA could have deleterious consequences on cell survival. This article is categorized under: RNA in Disease and Development > RNA in Disease RNA Structure and Dynamics > Influence of RNA Structure in Biological Systems RNA Processing > 3' End Processing.
    MeSH term(s) Humans ; Oxidative Stress/genetics ; Polyadenylation ; RNA, Messenger/chemistry ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; Stress, Physiological/genetics
    Chemical Substances RNA, Messenger
    Language English
    Publishing date 2019-05-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2634714-3
    ISSN 1757-7012 ; 1757-7004
    ISSN (online) 1757-7012
    ISSN 1757-7004
    DOI 10.1002/wrna.1540
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: G3BP1 controls the senescence-associated secretome and its impact on cancer progression.

    Omer, Amr / Barrera, Monica Cruz / Moran, Julian L / Lian, Xian J / Di Marco, Sergio / Beausejour, Christian / Gallouzi, Imed-Eddine

    Nature communications

    2020  Volume 11, Issue 1, Page(s) 4979

    Abstract: Cellular senescence is a known driver of carcinogenesis and age-related diseases, yet senescence is required for various physiological processes. However, the mechanisms and factors that control the negative effects of senescence while retaining its ... ...

    Abstract Cellular senescence is a known driver of carcinogenesis and age-related diseases, yet senescence is required for various physiological processes. However, the mechanisms and factors that control the negative effects of senescence while retaining its benefits are still elusive. Here, we show that the rasGAP SH3-binding protein 1 (G3BP1) is required for the activation of the senescent-associated secretory phenotype (SASP). During senescence, G3BP1 achieves this effect by promoting the association of the cyclic GMP-AMP synthase (cGAS) with cytosolic chromatin fragments. In turn, G3BP1, through cGAS, activates the NF-κB and STAT3 pathways, promoting SASP expression and secretion. G3BP1 depletion or pharmacological inhibition impairs the cGAS-pathway preventing the expression of SASP factors without affecting cell commitment to senescence. These SASPless senescent cells impair senescence-mediated growth of cancer cells in vitro and tumor growth in vivo. Our data reveal that G3BP1 is required for SASP expression and that SASP secretion is a primary mediator of senescence-associated tumor growth.
    MeSH term(s) A549 Cells ; Animals ; Carcinogenesis ; Cell Line ; Cell Movement ; Cellular Senescence/physiology ; Cytokines/metabolism ; DNA Helicases/antagonists & inhibitors ; DNA Helicases/deficiency ; DNA Helicases/metabolism ; Humans ; Inflammation ; Mice ; Neoplasms/metabolism ; Neoplasms/pathology ; Nucleotidyltransferases/metabolism ; Poly-ADP-Ribose Binding Proteins/antagonists & inhibitors ; Poly-ADP-Ribose Binding Proteins/deficiency ; Poly-ADP-Ribose Binding Proteins/metabolism ; RNA Helicases/antagonists & inhibitors ; RNA Helicases/deficiency ; RNA Helicases/metabolism ; RNA Recognition Motif Proteins/antagonists & inhibitors ; RNA Recognition Motif Proteins/deficiency ; RNA Recognition Motif Proteins/metabolism ; STAT3 Transcription Factor/metabolism ; Signal Transduction ; Transcription Factor RelA/metabolism
    Chemical Substances Cytokines ; Poly-ADP-Ribose Binding Proteins ; RELA protein, human ; RNA Recognition Motif Proteins ; STAT3 Transcription Factor ; STAT3 protein, human ; Transcription Factor RelA ; Nucleotidyltransferases (EC 2.7.7.-) ; cGAS protein, human (EC 2.7.7.-) ; DNA Helicases (EC 3.6.4.-) ; G3BP1 protein, human (EC 3.6.4.12) ; RNA Helicases (EC 3.6.4.13)
    Language English
    Publishing date 2020-10-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-020-18734-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Autophagy and heat-shock response impair stress granule assembly during cellular senescence.

    Omer, Amr / Patel, Devang / Moran, Julian Lucas / Lian, Xian Jin / Di Marco, Sergio / Gallouzi, Imed-Eddine

    Mechanisms of ageing and development

    2020  Volume 192, Page(s) 111382

    Abstract: Stress granules (SGs) are membraneless organelles formed in response to insult. These granules are related to pathological granules found in age-related neurogenerative diseases such as Parkinson's and Alzheimer's. Previously, we demonstrated that ... ...

    Abstract Stress granules (SGs) are membraneless organelles formed in response to insult. These granules are related to pathological granules found in age-related neurogenerative diseases such as Parkinson's and Alzheimer's. Previously, we demonstrated that senescent cells, which accumulate with age, exposed to chronic oxidative stress, are unable to form SGs. Here, we show that the senescent cells' inability to form SGs correlates with an upregulation in both the heat-shock response and autophagy pathways, both of which are well-established promoters of SG disassembly. Our data also reveals that the knockdown of HSP70 and ATG5, important components of the heat-shock response and autophagy pathways, respectively, restores the number of SGs formed in senescent cells exposed to chronic oxidative stress. Surprisingly, under these conditions, the depletion of HSP70 or ATG5 did not affect the clearance of these SGs during their recovery from chronic stress. These data reveal that senescent cells possess a unique heat-shock and autophagy-dependent ability to impair the formation of SGs in response to chronic stress, thereby expanding the existing understanding of SG dynamics in senescent cells and their potential contribution to age-related neurodegenerative diseases.
    MeSH term(s) Aging/physiology ; Autophagy/physiology ; Autophagy-Related Protein 5/metabolism ; Cell Line ; Cellular Senescence ; Cytoplasmic Granules/physiology ; Gene Expression Regulation ; HSP70 Heat-Shock Proteins/metabolism ; Heat-Shock Response/physiology ; Humans ; Oxidative Stress/physiology ; Ribonucleoproteins/metabolism ; Stress, Physiological
    Chemical Substances Autophagy-Related Protein 5 ; HSP70 Heat-Shock Proteins ; Ribonucleoproteins ; messenger ribonucleoprotein
    Language English
    Publishing date 2020-10-10
    Publishing country Ireland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 183915-9
    ISSN 1872-6216 ; 0047-6374
    ISSN (online) 1872-6216
    ISSN 0047-6374
    DOI 10.1016/j.mad.2020.111382
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Available for a limited time only: Regulating gene expression through mRNA turnover.

    Gallouzi, Imed Eddine / von Roretz, Christopher

    Seminars in cell & developmental biology

    2014  Volume 34, Page(s) 1

    MeSH term(s) Animals ; Gene Expression Regulation ; Humans ; RNA Stability ; RNA, Messenger/genetics ; RNA, Messenger/metabolism
    Chemical Substances RNA, Messenger
    Language English
    Publishing date 2014-10
    Publishing country England
    Document type Editorial ; Introductory Journal Article
    ZDB-ID 1312473-0
    ISSN 1096-3634 ; 1084-9521
    ISSN (online) 1096-3634
    ISSN 1084-9521
    DOI 10.1016/j.semcdb.2014.06.008
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  10. Article ; Online: Role of Human Antigen R (HuR) in the Regulation of Pulmonary ACE2 Expression.

    Aloufi, Noof / Haidar, Zahraa / Ding, Jun / Nair, Parameswaran / Benedetti, Andrea / Eidelman, David H / Gallouzi, Imed-Eddine / Di Marco, Sergio / Hussain, Sabah N / Baglole, Carolyn J

    Cells

    2021  Volume 11, Issue 1

    Abstract: Patients with COPD may be at an increased risk for severe illness from COVID-19 because of ACE2 upregulation, the entry receptor for SARS-CoV-2. Chronic exposure to cigarette smoke, the main risk factor for COPD, increases pulmonary ACE2. How ACE2 ... ...

    Abstract Patients with COPD may be at an increased risk for severe illness from COVID-19 because of ACE2 upregulation, the entry receptor for SARS-CoV-2. Chronic exposure to cigarette smoke, the main risk factor for COPD, increases pulmonary ACE2. How ACE2 expression is controlled is not known but may involve HuR, an RNA binding protein that increases protein expression by stabilizing mRNA. We hypothesized that HuR would increase ACE2 protein expression. We analyzed scRNA-seq data to profile
    MeSH term(s) Aged ; Angiotensin-Converting Enzyme 2/genetics ; Angiotensin-Converting Enzyme 2/metabolism ; COVID-19/genetics ; COVID-19/metabolism ; COVID-19/virology ; Cells, Cultured ; ELAV-Like Protein 1/genetics ; ELAV-Like Protein 1/metabolism ; Female ; Fibroblasts/metabolism ; Gene Expression Profiling/methods ; Gene Expression Regulation ; Humans ; Lung/metabolism ; Lung/pathology ; Lung/virology ; Male ; Middle Aged ; Pulmonary Disease, Chronic Obstructive/genetics ; Pulmonary Disease, Chronic Obstructive/metabolism ; Pulmonary Disease, Chronic Obstructive/virology ; RNA Interference ; RNA-Seq/methods ; SARS-CoV-2/physiology ; Single-Cell Analysis/methods
    Chemical Substances ELAV-Like Protein 1 ; ELAVL1 protein, human ; Angiotensin-Converting Enzyme 2 (EC 3.4.17.23)
    Language English
    Publishing date 2021-12-22
    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/cells11010022
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