Title : MRP1 modulators synergize with buthionine sulfoximine to exploit collateral sensitivity and selectively kill MRP1-expressing cancer cells.

Pub. Date : 2019 Oct

PMID : 31302132






11 Functional Relationships(s)
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1 We characterized a novel small molecule modulator that selectively enhanced MRP1-dependent efflux of reduced glutathione (GSH), an endogenous MRP1 substrate. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
2 We characterized a novel small molecule modulator that selectively enhanced MRP1-dependent efflux of reduced glutathione (GSH), an endogenous MRP1 substrate. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
3 We characterized a novel small molecule modulator that selectively enhanced MRP1-dependent efflux of reduced glutathione (GSH), an endogenous MRP1 substrate. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
4 We characterized a novel small molecule modulator that selectively enhanced MRP1-dependent efflux of reduced glutathione (GSH), an endogenous MRP1 substrate. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
5 Using cell lines expressing high levels of endogenous MRP1 from three difficult to treat cancer types-lung cancer, ovarian cancer and high-risk neuroblastoma-we showed that the MRP1 modulator substantially lowered intracellular GSH levels as a single agent. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
6 Using cell lines expressing high levels of endogenous MRP1 from three difficult to treat cancer types-lung cancer, ovarian cancer and high-risk neuroblastoma-we showed that the MRP1 modulator substantially lowered intracellular GSH levels as a single agent. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
7 The effect was on-target, as MRP1 knockdown abolished GSH depletion. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
8 The MRP1 modulator was synergistic with the GSH synthesis inhibitor buthionine sulfoximine (BSO), with the combination exhausting intracellular GSH, increasing intracellular reactive oxygen species (ROS) and abolishing clonogenic capacity. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
9 The MRP1 modulator was synergistic with the GSH synthesis inhibitor buthionine sulfoximine (BSO), with the combination exhausting intracellular GSH, increasing intracellular reactive oxygen species (ROS) and abolishing clonogenic capacity. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
10 GSH-depleting MRP1 modulators may therefore provide an enhanced therapeutic window to treat chemo-resistant MRP1-overexpressing pediatric and adult cancers. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens
11 GSH-depleting MRP1 modulators may therefore provide an enhanced therapeutic window to treat chemo-resistant MRP1-overexpressing pediatric and adult cancers. Glutathione ATP binding cassette subfamily B member 1 Homo sapiens