Modulation of the atypical multidrug-resistant phenotype by a hammerhead ribozyme directed against the ABC transporter BCRP/MXR/ABCG2

Item Type:	Article
Title:	Modulation of the atypical multidrug-resistant phenotype by a hammerhead ribozyme directed against the ABC transporter BCRP/MXR/ABCG2
Creators Name:	Kowalski, P. and Stein, U. and Scheffer, G.L. and Lage, H.
Abstract:	The phenomenon of multidrug resistance (MDR) in human cancers is one of the major causes of failure of chemotherapy. A recently identified new member of the superfamily of ATP-binding cassette transporters, breast cancer resistance protein (BCRP), was demonstrated to confer an atypical multidrug-resistant phenotype to tumor cells. To overcome the BCRP-mediated drug resistance, a specific anti-BCRP hammerhead ribozyme was introduced into the human gastric carcinoma cell line, EPG85-257RNOV, exhibiting an atypical MDR phenotype. By this approach, the expression levels of the targeted BCRP-encoding mRNA and the BCRP transport protein were decreased to the low constitutive expression level that was observed in highly drug-sensitive parental gastric carcinoma cells. In addition, in the anti-BCRP ribozyme-treated cells, the cellular drug accumulation was dramatically increased to the level measured in drug-sensitive cells. These effects were accompanied by an extensive reversal of the drug-resistant phenotype of more than 80%. Because additional mechanisms contribute to the multimodal-mediated MDR phenotype exhibited by this gastric carcinoma cell line, the data suggest that the BCRP-mediated contingent to the drug resistance was overcome nearly completely. Moreover, the data indicate that ribozyme-based gene therapy may be clinically applicable in preventing and reversing BCRP-mediated atypical MDR.
Keywords:	BCRP, Ribozyme, Atypical Multidrug Resistance, Mitoxantrone, Gastric Carcinoma
Source:	Cancer Gene Therapy
ISSN:	0929-1903
Publisher:	Nature Publishing Group
Volume:	9
Number:	7
Page Range:	579-586
Date:	July 2002
Official Publication:	https://doi.org/10.1038/sj.cgt.7700471
PubMed:	View item in PubMed

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