The mechanism of resistance to 2', 2'-difluorodeoxycytidine (gemcitabine) in a pancreatic cancer cell line / 中华肿瘤杂志
Chinese Journal of Oncology
;
(12): 721-726, 2005.
Article
in Chinese
| WPRIM
| ID: wpr-308453
ABSTRACT
<p><b>OBJECTIVE</b>To study the mechanism of resistance and its reversal to 2', 2'-difluorodeoxycytidine (gemcitabine) in a pancreatic cancer cell line SW1990.</p><p><b>METHODS</b>Immunohistochemistry and RT-PCR techniques were used to investigate the mechanism of drug resistance. Salvicine (SAL) was used to reverse the drug resistance in a gemcitabine-resistant pancreatic cancer cell line (SW1990-GEM). RT-PCR, flow cytometry and MTT assay were employed to evaluate the effect of reversing drug resistance by salvicine.</p><p><b>RESULTS</b>SW1990-GEM cells showed weak expression of P-glycoprotein (P-gp) revealed by immunohistochemistry, while its parental SW1990 cells were negative. Both cell lines did not express multidrug-resistance-related protein (MRP). As compared to the parental SW1990 cells, the mRNA expression of deoxycytidine kinase (dCK) was decreased while that of ribonucleotide reductase (RR) and mdr-1 was increased. With a concentration of 4 nmol/L, at one hr and 24 hr after SAL treatment, there was no change in mdr-1 mRNA expression, and the IC(50) of gemcitabine was 121.36 micromol/L and 121.64 micromol/L, respectively. However, when the concentration of SAL was increased to 30, 60, and 90 nmol/L, there was a dose-dependent down-regulation of mdr-1 mRNA expression in SW1990-GEM cells. The accumulation of rhodamine 123 was concomitantly increased, and the IC(50) of gemcitabine was correspondingly decreased.</p><p><b>CONCLUSION</b>The resistance to gemcitabine of a pancreatic cancer cell line is due to decreased expression of dCK and increased expression of RR and mdr-1. Salvicine, only in toxic concentrations, can reverse the drug resistance by down-regulating mdr-1 gene and P-gp expression.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pancreatic Neoplasms
/
Pathology
/
Pharmacology
/
RNA, Messenger
/
Down-Regulation
/
Gene Expression Regulation, Neoplastic
/
Naphthoquinones
/
ATP Binding Cassette Transporter, Subfamily B, Member 1
/
Drug Resistance, Neoplasm
/
Multidrug Resistance-Associated Proteins
Limits:
Humans
Language:
Chinese
Journal:
Chinese Journal of Oncology
Year:
2005
Type:
Article
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