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• W2783235177 abstract "Five new (1–5) and ten known (6–15) jatrophane diterpenoids were isolated from the fructus of Euphorbia sororia and their structures were elucidated by extensive spectroscopic analysis. The absolute configurations of compounds 1 and 4 were confirmed by X-ray crystallographic analysis. Cytotoxicity and anti-multidrug resistance effects of these jatrophane diterpenoids were evaluated in multidrug-resistant MCF-7/ADR breast cancer cells with an overexpression of P-glycoprotein (P-gp). Eight compounds (1, 2, 4, 6, 8, 10, 11, and 15) showed promising chemoreversal abilities compared to verapamil (VRP). The most potent compound, Euphosorophane A (1), possessed many advantages, including (1) high potency (EC50 = 92.68 ± 18.28 nM) in reversing P-gp-mediated resistance to doxorubicin (DOX), low cytotoxicity, and a high therapeutic index, (2) potency in reversing resistance to other cytotoxic agents associated with MDR, and (3) inhibition of P-gp-mediated Rhodamine123 (Rh123) efflux function in MCF-7/ADR cells. The results of the Western blot analysis indicated that the multidrug resistance (MDR) reversal induced by 1 was not due to the inhibiton of P-gp expression. Compound 1 stimulated P-gp-ATPase activity and caused the dose-dependent inhibition of DOX transport activity. Lineweaver-Burk and Dixon plots implied that 1 was a competitive inhibitor to DOX in the binding site of P-gp with a Ki of 0.49–0.50 μM. Our data suggested that 1 had a high binding affinity toward the DOX recognition site of P-gp. This resulted in inhibiting DOX transport, increasing intracellular DOX concentration, and finally resensitizing MCF-7/ADR to DOX. In addition, we discussed some added contents in the structure-activity relationship (SAR) of jatrophane diterpenoids." @default.
• W2783235177 created "2018-01-26" @default.
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• W2783235177 date "2018-02-01" @default.
• W2783235177 modified "2023-10-17" @default.
• W2783235177 title "Jatrophane diterpenoids from Euphorbia sororia as potent modulators against P-glycoprotein-based multidrug resistance" @default.
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• W2783235177 doi "https://doi.org/10.1016/j.ejmech.2018.01.027" @default.
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