Document Detail

Phorbol Ester TPA Modulates Chemoresistance in the Drug Sensitive Breast Cancer Cell Line MCF-7 by Inducing Expression of Drug Efflux Transporter ABCG2.
MedLine Citation:
PMID:  22938493     Owner:  NLM     Status:  In-Data-Review    
Recent studies have indicated a link between levels of cyclooxygenase-2 (COX-2) and development of the multidrug resistance (MDR) phenotype. The ATP-binding cassette sub-family G member 2 (ABCG2) is a major MDR-related transporter protein that is frequently overexpressed in cancer patients. In this study, we aimed to evaluate any positive correlation between COX-2 and ABCG2 gene expression using the COX-2 inducer 12-O-tetradecanoylphorbol-13-acetate (TPA) in human breast cancer cell lines. ABCG2 mRNA and protein expression was studied using real-time RT-PCR and flow cytometry, respectively. A significant increase of COX-2 mRNA expression (up to 11-fold by 4 h) was induced by TPA in MDA-MB-231 cells, this induction effect being lower in MCF-7 cells. TPA caused a considerable increase up to 9-fold in ABCG2 mRNA expression in parental MCF-7 cells, while it caused a small enhancement in ABCG2 expression up to 67 % by 4 h followed by a time-dependent decrease in ABCG2 mRNA expression in MDA-MB-231 cells. TPA treatment resulted in a slight increase of ABCG2 protein expression in MCF-7 cells, while a time-dependent decrease in ABCG2 protein expression was occurred in MDA-MB-231 cells. In conclusion, based on the observed effects of TPA in MDA-Mb-231 cells, it is proposed that TPA up-regulates ABCG2 expression in the drug sensitive MCF-7 breast cancer cell line through COX-2 unrelated pathways.
Fatemeh Kalalinia; Fatemeh Elahian; Mitra Hassani; Jamal Kasaeeian; Javad Behravan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Asian Pacific journal of cancer prevention : APJCP     Volume:  13     ISSN:  1513-7368     ISO Abbreviation:  Asian Pac. J. Cancer Prev.     Publication Date:  2012  
Date Detail:
Created Date:  2012-09-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101130625     Medline TA:  Asian Pac J Cancer Prev     Country:  Thailand    
Other Details:
Languages:  eng     Pagination:  2979-84     Citation Subset:  IM    
Biotechnology Research Center, Mashhad, Iran E-mail :,
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