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  1. Article: p53, A Victim of the Prion Fashion.

    Billant, Olivier / Friocourt, Gaëlle / Roux, Pierre / Voisset, Cécile

    Cancers

    2021  Volume 13, Issue 2

    Abstract: Identified in the late 1970s as an oncogene, a driving force leading to tumor development, p53 turned out to be a key tumor suppressor gene. Now p53 is considered a master gene regulating the transcription of over 3000 target genes and controlling a ... ...

    Abstract Identified in the late 1970s as an oncogene, a driving force leading to tumor development, p53 turned out to be a key tumor suppressor gene. Now p53 is considered a master gene regulating the transcription of over 3000 target genes and controlling a remarkable number of cellular functions. The elevated prevalence of p53 mutations in human cancers has led to a recurring questioning about the roles of mutant p53 proteins and their functional consequences. Both mutants and isoforms of p53 have been attributed dominant-negative and gain of function properties among which is the ability to form amyloid aggregates and behave in a prion-like manner. This report challenges the ongoing "prion p53" hypothesis by reviewing evidence of p53 behavior in light of our current knowledge regarding amyloid proteins, prionoids and prions.
    Language English
    Publishing date 2021-01-13
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2527080-1
    ISSN 2072-6694
    ISSN 2072-6694
    DOI 10.3390/cancers13020269
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: p53, p63 and p73 in the wonderland of

    Billant, Olivier / Blondel, Marc / Voisset, Cécile

    Oncotarget

    2017  Volume 8, Issue 34, Page(s) 57855–57869

    Abstract: Since its discovery in 1979, p53 has been on the forefront of cancer research. It is considered a master gene of cancer suppression and is found mutated in around 50% of all human tumors. In addition, the progressive identification of p53-related ... ...

    Abstract Since its discovery in 1979, p53 has been on the forefront of cancer research. It is considered a master gene of cancer suppression and is found mutated in around 50% of all human tumors. In addition, the progressive identification of p53-related transcription factors p63 and p73 as well as their multiple isoforms have added further layers of complexity to an already dense network. Among the numerous models used to unravel the p53 family mysteries,
    Language English
    Publishing date 2017-08-22
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.18506
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: The dominant-negative interplay between p53, p63 and p73: A family affair.

    Billant, Olivier / Léon, Alice / Le Guellec, Solenn / Friocourt, Gaëlle / Blondel, Marc / Voisset, Cécile

    Oncotarget

    2016  Volume 7, Issue 43, Page(s) 69549–69564

    Abstract: The tumor suppression activity of p53 is frequently impaired in cancers even when a wild-type copy of the gene is still present, suggesting that a dominant-negative effect is exerted by some of p53 mutants and isoforms. p63 and p73, which are related to ... ...

    Abstract The tumor suppression activity of p53 is frequently impaired in cancers even when a wild-type copy of the gene is still present, suggesting that a dominant-negative effect is exerted by some of p53 mutants and isoforms. p63 and p73, which are related to p53, have also been reported to be subjected to a similar loss of function, suggesting that a dominant-negative interplay might happen between p53, p63 and p73. However, to which extent p53 hotspot mutants and isoforms of p53, p63 and p73 are able to interfere with the tumor suppressive activity of their siblings as well as the underlying mechanisms remain undeciphered. Using yeast, we showed that a dominant-negative effect is widely spread within the p53/p63/p73 family as all p53 loss-of-function hotspot mutants and several of the isoforms of p53 and p73 tested exhibit a dominant-negative potential. In addition, we found that this dominant-negative effect over p53 wild-type is based on tetramer poisoning through the formation of inactive hetero-tetramers and does not rely on a prion-like mechanism contrary to what has been previously suggested. We also showed that mutant p53-R175H gains the ability to inhibit p63 and p73 activity by a mechanism that is only partially based on tetramerization.
    Language English
    Publishing date 2016-10-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.11774
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Nucleolin directly mediates Epstein-Barr virus immune evasion through binding to G-quadruplexes of EBNA1 mRNA.

    Lista, María José / Martins, Rodrigo Prado / Billant, Olivier / Contesse, Marie-Astrid / Findakly, Sarah / Pochard, Pierre / Daskalogianni, Chrysoula / Beauvineau, Claire / Guetta, Corinne / Jamin, Christophe / Teulade-Fichou, Marie-Paule / Fåhraeus, Robin / Voisset, Cécile / Blondel, Marc

    Nature communications

    2017  Volume 8, Page(s) 16043

    Abstract: The oncogenic Epstein-Barr virus (EBV) evades the immune system but has an Achilles heel: its genome maintenance protein EBNA1, which is essential for viral genome maintenance but highly antigenic. EBV has seemingly evolved a system in which the mRNA ... ...

    Abstract The oncogenic Epstein-Barr virus (EBV) evades the immune system but has an Achilles heel: its genome maintenance protein EBNA1, which is essential for viral genome maintenance but highly antigenic. EBV has seemingly evolved a system in which the mRNA sequence encoding the glycine-alanine repeats (GAr) of the EBNA1 protein limits its expression to the minimal level necessary for function while minimizing immune recognition. Here, we identify nucleolin (NCL) as a host factor required for this process via a direct interaction with G-quadruplexes formed in GAr-encoding mRNA sequence. Overexpression of NCL enhances GAr-based inhibition of EBNA1 protein expression, whereas its downregulation relieves the suppression of both expression and antigen presentation. Moreover, the G-quadruplex ligand PhenDC3 prevents NCL binding to EBNA1 mRNA and reverses GAr-mediated repression of EBNA1 expression and antigen presentation. Hence the NCL-EBNA1 mRNA interaction is a relevant therapeutic target to trigger an immune response against EBV-carrying cancers.
    MeSH term(s) Aminoquinolines/pharmacology ; Animals ; B-Lymphocytes/drug effects ; B-Lymphocytes/immunology ; B-Lymphocytes/virology ; Cell Line, Tumor ; Epstein-Barr Virus Nuclear Antigens/genetics ; Epstein-Barr Virus Nuclear Antigens/immunology ; G-Quadruplexes ; HCT116 Cells ; Herpesvirus 4, Human/drug effects ; Herpesvirus 4, Human/genetics ; Herpesvirus 4, Human/immunology ; Host-Pathogen Interactions ; Humans ; Immune Evasion/genetics ; Leontopithecus ; Ligands ; Phosphoproteins/genetics ; Phosphoproteins/immunology ; Picolinic Acids/pharmacology ; Quinolines/pharmacology ; RNA, Messenger/genetics ; RNA, Messenger/immunology ; RNA-Binding Proteins/genetics ; RNA-Binding Proteins/immunology ; Saccharomyces cerevisiae/genetics ; Saccharomyces cerevisiae/metabolism ; Nucleolin
    Chemical Substances Aminoquinolines ; Epstein-Barr Virus Nuclear Antigens ; Ligands ; Phosphoproteins ; Picolinic Acids ; Quinolines ; RNA, Messenger ; RNA-Binding Proteins ; pyridostatin ; EBV-encoded nuclear antigen 1 (O5GA75RST7)
    Language English
    Publishing date 2017-07-07
    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/ncomms16043
    Database MEDical Literature Analysis and Retrieval System OnLINE

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