國家衛生研究院 NHRI:Item 3990099045/1664
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/1664


    Title: Overcoming trastuzumab resistance in HER2-overexpressing breast cancer cells by using a novel celecoxib-derived phosphoinositide-dependent kinase-1 inhibitor
    Authors: Tseng, PH;Wang, YC;Weng, SC;Weng, JR;Chen, CS;Brueggemeier, RW;Shapiro, CL;Chen, CY;Dunn, SE;Pollak, M;Chen, CS
    Contributors: Division of Gerontology Research
    Abstract: Although trastuzumab has been successfully used in patients with HER2-overexpressing metastatic breast cancer, resistance is a common problem that ultimately culminates in treatment failure. In light of the importance of Akt signaling in trastuzumab's antitumor action, we hypothesized that concurrent inhibition of Akt could enhance trastuzumab sensitivity and moreover reverse the resistant phenotype in HER2-positive breast cancer cells. Based on our finding that celecoxib mediates antitumor effects through the inhibition of phosphoinositide-dependent kinase-1 (PDK-1)/Akt signaling independently of cyclooxygenase-2 (COX-2), we used celecoxib as a scaffold to develop a COX-2-inactive PDK-1 inhibitor, 2-amino-N-[4-[5-(2-phenanthrenyl)-3-(trifluoromethyl)-1-Hpyrazol-1-yl]phenyl]-acetamide (OSU-03012). Here, we investigated the effect of OSU-03012 on trastuzumab-mediated apoptosis in four breast cancer cell lines with different HER2 expression and trastuzumab-resistance status, including MDAMB-231, BT474, SKBR3, and insulin-like growth factor-I receptor-overexpressing SKBR3 (SKBR3/IGF-IR). Effects of trastuzumab and OSU-03012, individually or in combination, on cell viability and changes in pertinent biomarkers including HER2 expression, phosphorylation of Akt, p27(kip1), and the PDK-1 substrate p70(S6K) were assessed. OSU-03012 alone was able to trigger apoptosis in all cell lines with equal potency (IC50 = 3-4 mu M), suggesting no cross-resistance with trastuzumab. Medium dose-effect analysis indicates that OSU-03012 potentiated trastuzumab's antiproliferative effect in HER2-positive cells, especially in SKBR3/IGF-IR cells, through the down-regulation of PDK-1/Akt signaling. This synergy, however, was not observed in HER2-negative MDA-MB-231 cells. This combination treatment represents a novel strategy to increase the efficacy of trastuzumab and to overcome trastuzumab resistance in the treatment of HER2-positive breast cancer.
    Keywords: Pharmacology & Pharmacy
    Date: 2006-11
    Relation: Molecular Pharmacology. 2006 Nov;70(5):1534-1541.
    Link to: http://dx.doi.org/10.1124/mol.106.023911
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0026-895X&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000241436100008
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=33751168744
    Appears in Collections:[Ching-Yu Chen(2006-2010)] Periodical Articles

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