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Molecular Pharmacology

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Research ArticleArticle

Breast Cancer Resistance Protein (BCRP/ABCG2) Induces Cellular Resistance to HIV-1 Nucleoside Reverse Transcriptase Inhibitors

Xin Wang, Tatsuhiko Furukawa, Takao Nitanda, Mika Okamoto, Yoshikazu Sugimoto, Shin-Ichi Akiyama and Masanori Baba
Molecular Pharmacology January 2003, 63 (1) 65-72; DOI: https://doi.org/10.1124/mol.63.1.65
Xin Wang
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Tatsuhiko Furukawa
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Takao Nitanda
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Mika Okamoto
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Yoshikazu Sugimoto
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Shin-Ichi Akiyama
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Masanori Baba
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Abstract

Breast cancer resistance protein (BCRP/ABCG2) is a novel member of ATP- binding cassette transporters, which induce multidrug resistance in cancer cells. We found that a high level of BCRP expression in CD4+ T cells conferred cellular resistance to human immunodeficiency virus type-1 (HIV-1) nucleoside reverse transcriptase inhibitors. The cell line MT-4/DOX500 was established through the long-term culture of MT-4 cells in the presence of doxorubicin (DOX) and had reduced sensitivity to not only DOX but also zidovudine (AZT). MT-4/DOX500 cells showed reduced intracellular accumulation and retention of DOX and increased ATP-dependent rhodamine 123 efflux. The cells were also resistant to several anticancer agents such as mitoxantrone, 7-ethyl-10-[4-(1-piperidino)-1-piperidino]carbonyloxycamptothecin, and 7-ethyl-10-hydroxycamptothecin. AZT was 7.5-fold less inhibitory to HIV-1 replication in MT-4/DOX500 cells than in MT-4 cells. Furthermore, the anti–HIV-1 activity of lamivudine was severely impaired in MT-4/DOX500 cells. In contrast, the antiviral activity of non-nucleoside reverse transcriptase inhibitors and protease inhibitors was not affected in the cells. MT-4/DOX500 cells expressed glycosylated BCRP but not P-glycoprotein (ABCB1), multidrug resistance protein 1, 2, or 4 (ABCC1, -2, or -4), or lung resistance-related protein. In addition, the BCRP-specific inhibitor fumitremorgin C completely abolished the resistance of MT-4/DOX500 cells to AZT as well as to DOX. An analysis for intracellular metabolism of AZT suggests that the resistance is attributed to the increase of ATP-dependent efflux of its metabolites, presumably AZT 5′-monophosphate, in MT-4/DOX500 cells.

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Molecular Pharmacology: 63 (1)
Molecular Pharmacology
Vol. 63, Issue 1
1 Jan 2003
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Research ArticleArticle

Breast Cancer Resistance Protein (BCRP/ABCG2) Induces Cellular Resistance to HIV-1 Nucleoside Reverse Transcriptase Inhibitors

Xin Wang, Tatsuhiko Furukawa, Takao Nitanda, Mika Okamoto, Yoshikazu Sugimoto, Shin-Ichi Akiyama and Masanori Baba
Molecular Pharmacology January 1, 2003, 63 (1) 65-72; DOI: https://doi.org/10.1124/mol.63.1.65

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Research ArticleArticle

Breast Cancer Resistance Protein (BCRP/ABCG2) Induces Cellular Resistance to HIV-1 Nucleoside Reverse Transcriptase Inhibitors

Xin Wang, Tatsuhiko Furukawa, Takao Nitanda, Mika Okamoto, Yoshikazu Sugimoto, Shin-Ichi Akiyama and Masanori Baba
Molecular Pharmacology January 1, 2003, 63 (1) 65-72; DOI: https://doi.org/10.1124/mol.63.1.65
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