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Purpose Geldanamycin and its analogues belong to a new class of anticancer agents that inhibit the molecular chaperone heat shock protein 90. We hypothesized that membrane transporters expressed on tumor cells may contribute at least in part to cellular sensitivity to these agents. The purpose of this study is to identify novel transporters as determinant for sensitivity and resistance to geldanamycins...
Purpose Methotrexate (MTX) causes dose-limiting gastrointestinal toxicity due to exposure of intestinal tissues, and is a substrate of the multidrug resistance-associated protein (MRP) 1. Here we examine the involvement of MRP1, which is reported to be highly expressed in the proliferative crypt compartment of the small intestine, in the gastrointestinal toxicity of MTX. Methods MTX was intraperitonealy...
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