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    TIAM1-RAC1 promote small-cell lung cancer cell survival through antagonizing Nur77-induced BCL2 conformational change

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    Authors
    Payapilly, Aishwarya
    Guilbert, Ryan
    Descamps, Tine
    White, Gavin R M
    Magee, Peter
    Zhou, Cong
    Kerr, Alastair
    Simpson, Kathryn L
    Blackhall, Fiona H
    Dive, Caroline
    Malliri, Angeliki
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    Affiliation
    Cell Signalling Group, Cancer Research UK Manchester Institute, The University of Manchester, Alderley Park SK10 4TG
    Issue Date
    2021
    
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    Abstract
    Small-cell lung cancer (SCLC), an aggressive neuroendocrine malignancy, has limited treatment options beyond platinum-based chemotherapy, whereafter acquired resistance is rapid and common. By analyzing expression data from SCLC tumors, patient-derived models, and established cell lines, we show that the expression of TIAM1, an activator of the small GTPase RAC1, is associated with a neuroendocrine gene program. TIAM1 depletion or RAC1 inhibition reduces viability and tumorigenicity of SCLC cells by increasing apoptosis associated with conversion of BCL2 from its pro-survival to pro-apoptotic function via BH3 domain exposure. This conversion is dependent upon cytoplasmic translocation of Nur77, an orphan nuclear receptor. TIAM1 interacts with and sequesters Nur77 in SCLC cell nuclei and TIAM1 depletion or RAC1 inhibition promotes Nur77 translocation to the cytoplasm. Mutant TIAM1 with reduced Nur77 binding fails to suppress apoptosis triggered by TIAM1 depletion. In conclusion, TIAM1-RAC1 signaling promotes SCLC cell survival via Nur77 nuclear sequestration.
    Citation
    Payapilly A, Guilbert R, Descamps T, White G, Magee P, Zhou C, et al. TIAM1-RAC1 promote small-cell lung cancer cell survival through antagonizing Nur77-induced BCL2 conformational change [Internet]. Vol. 37, Cell Reports. Elsevier BV; 2021. p. 109979.
    Journal
    Cell Reports
    URI
    http://hdl.handle.net/10541/624761
    DOI
    10.1016/j.celrep.2021.109979
    PubMed ID
    34758330
    Additional Links
    https://dx.doi.org/10.1016/j.celrep.2021.109979
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.celrep.2021.109979
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