國家衛生研究院 NHRI:Item 3990099045/5491
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/5491


    Title: Camptothecin-induced downregulation of MLL5 contributes to the activation of tumor suppressor p53
    Authors: Cheng, F;Liu, J;Teh, C;Chong, SW;Korzh, V;Jiang, YJ;Deng, LW
    Contributors: Division of Molecular and Genomic Medicine
    Abstract: Mixed lineage leukemia 5 (MLL5) has been implicated in multiple aspects of cell physiology, such as hematopoiesis, cell cycle control and chromatin regulatory network. In this study, we present evidence that MLL5 is involved in the camptothecin (CPT)-induced p53 activation. CPT promoted the degradation of MLL5 protein in a time- and dose-dependent manner in actively replicating cells. The downregulation of MLL5 led to phosphorylation of p53 at Ser392, which was abrogated by exogenous overexpression of MLL5. In MLL5-knockdown cells, p53 protein was stabilized and bound to DNA with higher affinity, leading to activation of downstream genes. Co-immunoprecipitation showed that MLL5 preferentially interacted with the tetramerized form of p53, and knockdown of MLL5 promoted chromatin accumulation of p53 tetramers, suggesting that the association of MLL5 with p53 may prevent the p53 tetramers from binding to the chromatin target sites. The role of MLL5 in CPT-induced p53 activation was conserved in developing zebrafish, where CPT downregulated zebrafish Mll5 protein, and the microinjection of zebrafish mll5 mRNA substantially blocked the CPT-induced apoptosis. In summary, our study proposed MLL5 as a novel component in the regulation of p53 homeostasis and a new cellular determinant of CPT.
    Date: 2011-08
    Relation: Oncogene. 2011 Aug;30(33):3599-3611.
    Link to: http://dx.doi.org/10.1038/onc.2011.71
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0950-9232&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000294005100004
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=80051786169
    Appears in Collections:[Yun-Jin Jiang] Periodical Articles

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