Collateral sensitivity of multidrug-resistant cells to the orphan drug tiopronin.

Collateral sensitivity of multidrug-resistant cells to the orphan drug tiopronin.
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DOI:
10.1021/jm2001663
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发表时间:
2011-07-28
影响因子:
7.3
通讯作者:
Gottesman MM
Gottesman MM
中科院分区:
医学1区
文献类型:
--
作者:
Goldsborough AS;Handley MD;Dulcey AE;Pluchino KM;Kannan P;Brimacombe KR;Hall MD;Griffiths G;Gottesman MM

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A major challenge in the treatment of cancer is multidrug resistance (MDR) that develops during chemotherapy. Here we demonstrate that tiopronin (1), a thiol-substituted N-propanoylglycine derivative, was selectively toxic to a series of cell lines expressing the drug efflux pump P-glycoprotein (P-gp, ABCB1) and MRP1 (ABCC1). Treatment of MDR cells with 1 led to instability of the ABCB1 mRNA and consequently a reduction in P-gp protein, despite functional assays demonstrating that tiopronin does not interact with P-gp. Long-term exposure of P-gp-expressing cells to 1 sensitized them to doxorubicin and taxol, both P-gp substrates. Treatment of MRP1-overexpressing cells with tiopronin led to a significant reduction in MRP1 protein. Synthesis and screening of analogs of tiopronin demonstrated that the thiol functional group was essential for collateral sensitivity, while substitution of the amino acid backbone altered but did not destroy specificity, pointing to future development of targeted analogs.
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