國家衛生研究院 NHRI:Item 3990099045/5453
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/5453


    Title: Klf10 induces cell apoptosis through modulation of BI-1 expression and Ca2+ homeostasis in estrogen-responding adenocarcinoma cells
    Authors: Hsu, CF;Sui, CL;Wu, WC;Wang, JJ;Yang, DHA;Chen, YC;Yu, WCY;Chang, HS
    Contributors: National Institute of Cancer Research
    Abstract: Estrogen stimulates cell growth and inhibits apoptosis through estrogen receptor-mediated mechanisms in many cell types. Remarkably, there is another dimension to estrogen action by which apoptosis is induced in breast cancer cells. While these mechanisms are not yet completely understood, finding the molecules involved has paved the way for the development of a new drug group. Using ChIP-chip, we have demonstrated that Klf10, a Kruppel-like zinc finger transcription factor, which was induced in response to estrogen, directly modulates the transcription of BI-1 (Bax inhibitor-1; also called the testis-enhanced gene transcript, TEGT). Eventually, the estrogen induced Klf10 and then suppresses BI-1 transcription. The estrogen/Klf10/BI-1 interrelationship was further confirmed using BI-1 promoter and EMSA assays. The estrogen-elicited reduction of BI-1 promoter activity was significantly reversed when the Klf10 binding element was mutated to abolish Klf10 binding. A si-Klf10 antisense-oligo nucleotide was also able to restore BI-1 promoter activity to its pre-estrogen-treatment level. BI-1 is known to regulate stress via the endoplasmic reticulum; in this context down-regulation of BI-1 is able to cause Ca2+ release and trigger an apoptosis pathway in breast cancer. In our study, Klf10 not only suppressed cellular BI-1 expression but also increased the cytosolic Ca2+ concentration, eventually causing apoptotic cell death. Based on these results, we suggest the pathway by which estrogen induces apoptosis is possibly through an up-regulation of Klf10 that decreases BI-1 and finally increases the concentration of cytoplasmic calcium.
    Date: 2011-02
    Relation: International Journal of Biochemistry and Cell Biology. 2011 Feb;43(4):666-673.
    Link to: http://dx.doi.org/10.1016/j.biocel.2011.01.010
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1357-2725&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000288736800026
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=79952106489
    Appears in Collections:[Winston C.Y. Yu] Periodical Articles

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