psorospermin/cáncer

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Psorospermin structural requirements for P-glycoprotein resistance reversal.

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Resistance to chemotherapy reduces its effectiveness, resulting in increased mortality. Psorospermin, a natural product, is a topoisomerase II-directed DNA alkylating agent active against multidrug-resistant (MDR) cell lines, including multiple myeloma. In this study, the mechanism of the

Gamma-pyrone compounds as potential anti-cancer drugs.

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The gamma-pyrones, artomunoxanthotrione epoxide, cyclocommunol, cyclomulberrin, and cyclocommunin exhibited potent inhibition of human PLC/PRF/5 and KB cells in-vitro. Dihydroisocycloartomunin showed significant and potent inhibition of human PLC/PRF/5 and KB cells in-vitro, respectively.

Design, synthesis, and evaluation of psorospermin/quinobenzoxazine hybrids as structurally novel antitumor agents.

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Topoisomerase II, an enzyme that catalyzes changes in the topology of DNA, plays several key roles in DNA metabolism and chromosome structure, and it is the primary cytotoxic target for a number of clinically important DNA intercalating agents such as doxorubicin. It seems likely that if these

Structural insight into a quinolone-topoisomerase II-DNA complex. Further evidence for a 2:2 quinobenzoxazine-mg2+ self-assembly model formed in the presence of topoisomerase ii.

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Quinobenzoxazine A-62176, developed from the antibacterial fluoroquinolones, is active in vitro and in vivo against murine and human tumors. It has been previously claimed that A-62176 is a catalytic inhibitor of mammalian topoisomerase II that does not stabilize the cleaved complex. However, at low

Design, synthesis and anticancer activity of novel dihydrobenzofuro[4,5-b][1,8]naphthyridin-6-one derivatives.

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On the basis of the chemical structures of psorospermin with a xanthone template and acronycine derivatives with an acridone template, rac-1 and rac-2 constructed on an 1,2-dihydrobenzofuro[4,5-b][1,8]naphthyridin-6(11H)-one scaffold were designed and synthesized as potential anticancer agents.

Fused xanthone derivatives as antiproliferative agents.

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Xanthones have been isolated from several natural sources, mainly belonging in Guttiferae and Gentianaceae families as secondary plant metabolites and many of them are endowed with diverse pharmacological properties. We have focused in the study of cytotoxic fused xanthone derivatives, having in

Acronycine derivatives: a promising series of anticancer agents.

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The pyranoacridone acronycine (1) exhibits antitumor properties against a large panel of solid tumor models, but its moderate potency and low water solubility severely hampered the subsequent clinical trials. Development of synthetic analogues followed the isolation from several Sarcomelicope

Xanthone derivatives: new insights in biological activities.

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Xanthones or xanthen-9H-ones (dibenzo-gamma-pirone) comprise an important class of oxygenated heterocycles whose role is well-known in Medicinal Chemistry. The biological activities of this class of compounds are associated with their tricyclic scaffold but vary depending on the nature and/or

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