期刊
JOURNAL OF CHEMOTHERAPY
卷 18, 期 1, 页码 66-73出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/joc.2006.18.1.66
关键词
human non-small cell lung carcinoma (NSCLC); doxorubicin; pacilitaxel; multidrug resistance; verapamil; curcumin; P-glycoprotein; doxorubicin efflux; RT-PCR; glutathione-S-transferase
Exposure of human non-small cell lung cancer cells (NCI-H460) to gradually increasing concentrations of doxorubicin resulted in the appearance of a new cell line (NCI-H460/R) that was resistant to doxorubicin (96.2-fold) and cross-resistant to etoposide, paclitaxel, vinblastine and epirubicin. Slight cross-resistance to two MDR-unrelated drugs 8-Cl-cAMP and sulfinosine was observed. Flow cytometry analysis showed that the accumulation of doxorubicin in the resistant cells was 88.4% lower than in the parental cells. Also, verapamil significantly decreased the efflux rate in NCI-H460 and NCI-H460/R cells, whereas curcumin inhibited the efflux in NCI-H460 cells only. Gene expression data confirmed the induction of mdr1(P-gp), as judged by the observed 15-fold increase in its mRNA concentration in doxorubicin-resistant NCI-H460/R cells. In contrast, mrp1 and lrp expression was unaffected by the doxorubicin resistance. Further work should develop a rationale for a novel treatment of NSCLC with appropriate modulators of resistance aimed at improving the outcome of the acquired drug resistance.
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