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Tamoxifen reverses the multi-drug-resistance of an established human cholangiocarcinoma cell line in combined chemotherapeutics.
MedLine Citation:
PMID:  20835928     Owner:  NLM     Status:  In-Data-Review    
Our previous study established the human multi-drug-resistant cholangiocarcinoma cell line QBC939/ADM. In this study, we investigate further the ability of tamoxifen (TAM) to reverse drug-resistance to chemotherapeutics using QBC939/ADM cells. Cell growth inhibition was determined by the MTT assay, while cell cycle progression, apoptosis and the intra-cellular concentration of adriamycin (ADM) were all determined by flow cytometry. P-glycoprotein (P-gp) protein and mRNA expression was determined by Western blotting and real-time PCR. Growth inhibition and apoptosis induced by ADM, mitomycin (MMC), or vindesine (VDS) were enhanced after pre-treatment with 5 or 10 μM TAM, while only VDS increased cell numbers in the G(2)/M phase. The intra-cellular concentration of ADM rose after pre-treatment with 10 μM TAM, but not 5 μM TAM. Furthermore, real-time PCR and western blot analysis revealed down-regulation of P-gp expression in QBC939/ADM cells after TAM pre-treatment. The enhanced effects of TAM on growth inhibition, apoptosis, and intra-cellular concentration and the down-regulation of P-gp expression were blocked by an anti-P-gp antibody. TAM (10 μM) may reverse the multi-drug-resistance (MDR) of QBC939/ADM and enhance the chemotherapeutic effects on cholangiocarcinoma, by competitively inhibiting over-expressed P-gp.
Zhi-Hua Liu; Yan-Lei Ma; Yan-Ping He; Peng Zhang; Yu-Kun Zhou; Huanlong Qin
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Publication Detail:
Type:  Journal Article     Date:  2010-09-14
Journal Detail:
Title:  Molecular biology reports     Volume:  38     ISSN:  1573-4978     ISO Abbreviation:  Mol. Biol. Rep.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0403234     Medline TA:  Mol Biol Rep     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1769-75     Citation Subset:  IM    
Department of Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 600 Yishan Road, Shanghai, 200233, China.
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