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Elacridar enhances the cytotoxic effects of sunitinib and prevents multidrug resistance in renal carcinoma cells.

Abstract：

:Intrinsic drug resistance occurs in many renal carcinomas and is associated with increased expression of multidrug resistant proteins, which inhibits intracellular drug accumulation. Multidrug resistant protein 1, also known as P-glycoprotein, is a membrane drug efflux pump belonging to the ATP-binding cassette (ABC) transporter superfamily. ABC Sub-family B Member 2 (ABCG2) is widely distributed and is involved in the multidrug resistant phenotype. Sunitinib is a tyrosine kinase inhibitor used to treat kidney cancer that disrupts signaling pathways responsible for abnormal cancer cell proliferation and tumor angiogenesis. Multiple drug resistance is important in tyrosine kinase inhibitor-induced resistance. We hypothesized that inhibition of multidrug resistant transporters by elacridar (dual inhibitor of P-glycoprotein and ABCG 2) might overcome sunitinib resistance in experimental renal cell carcinoma. Human renal carcinoma cell lines 786-O, ACHN, and Caki-1 were treated with sunitinib or elacridar alone, or in combination. We showed that elacridar significantly enhanced sunitinib cytotoxicity in 786-O cells. P-glycoprotein activity, confirmed by P-glycoprotein function assay, was found to be inhibited by elacridar. ABCG2 expression was low in all renal carcinoma cell lines, and was suppressed only by combination treatment in 786-O cells. ABCG2 function was inhibited by sunitinib alone or combination with elacridar but not elacridar alone. These findings suggest that sunitinib resistance involves multidrug resistance transporters, and in combination with elacridar, can be reversed in renal carcinoma cells by P-glycoprotein inhibition.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Sato H,Siddig S,Uzu M,Suzuki S,Nomura Y,Kashiba T,Gushimiyagi K,Sekine Y,Uehara T,Arano Y,Yamaura K,Ueno K

doi

10.1016/j.ejphar.2014.11.021

subject

Has Abstract

pub_date

2015-01-05 00:00:00

pages

258-66

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(14)00802-4

journal_volume

746

pub_type

杂志文章

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