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Rosiglitazone Reverses Mitomycin C Resistance in Human Gastric Cancer Cells.
MedLine Citation:
PMID:  22052411     Owner:  NLM     Status:  Publisher    
INTRODUCTION:: To explore the mechanisms of rosiglitazone (ROS), a selective peroxisome proliferator-activated receptor gamma ligand, in reversing mitomycin C (MMC) resistance in a human drug-resistant gastric cancer cell line. METHODS:: The vincristine-resistant human gastric cancer cell line SGC7901/VCR and its parental cell line SGC7901 were treated with ROS, MMC (negative control), cyclosporine A+MMC (positive control) or ROS+MMC. A tetrazolium blue (methyl thiazolyl tetrazolium) assay was used to evaluate the sensitivity to these treatments. Flow cytometry analysis and acridine orange-ethidium bromide (AO-EB) fluorescent staining were used to determine the effects of ROS on MMC-induced apoptosis. Reverse transcription polymerase chain reaction and western blotting were used to measure the expression of multidrug resistant 1 (MDR1), Livin and P-glycoprotein (P-gp). RESULTS:: ROS administration dose dependently increased the reversal index in MMC-treated SCG7901/VCR cells. ROS increased apoptosis in SGC7901/VCR cells compared with the blank group and MMC group. ROS+MMC also increased apoptosis in SGC7901/VCR cells compared with other groups (P < 0.05 or P < 0.01). The mRNA expression of MDR1 and Livin and the protein expression of P-gp in SGC7901/VCR cells were significantly higher than those in SGC7901 cells (P < 0.01). However, ROS or ROS+MMC treatment markedly upregulated the mRNA expression of MDR1 and Livin and the protein expression of P-gp in SGC7901/VCR cells (P < 0.01). CONCLUSIONS:: ROS reverses MMC resistance in human gastric cancer SGC7901/VCR cells by reducing expression of MDR1, Livin and P-gp and increasing apoptosis.
Li Zhang; Jian-Feng Hu; Guo-Qing Li; Xiang Xiao; Qi Su
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-2
Journal Detail:
Title:  The American journal of the medical sciences     Volume:  -     ISSN:  1538-2990     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370506     Medline TA:  Am J Med Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
From the Cancer Research Institute (lz, qs), University of South China, Hengyang 421001, Hunan, China; and Department of Gastroenterology (lz, j-fh, g-ql, xx), The Second Affiliated Hospital, University of South China, Hengyang, Hunan, China.
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