期刊
JOURNAL OF NATURAL PRODUCTS
卷 81, 期 9, 页码 2032-2040出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.8b00326
关键词
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资金
- European Structural & Investment Funds through the COMPETE Programme
- National Funds through FCT, Fundacao para a Ciencia e a Tecnologia [PTDC/QEQMED/0905/2012, UID/DTP/04138/2013, SAICT-PAC/0019/2015, PTDC/MED-QUI/30591/2017]
- FCT [SFRH/BD/84285/2012]
- [GINOP-2.3.2-15-2016-00012]
- Fundação para a Ciência e a Tecnologia [PTDC/MED-QUI/30591/2017, UID/DTP/04138/2013] Funding Source: FCT
The phytochemical study of Euphorbia pedroi led to the isolation of a new tetracyclic triterpenoid with an unusual spiro scaffold, spiropedroxodiol (1), along with seven known terpenoids (2-8). Aiming at obtaining compounds with improved multidrug-resistance (MDR) reversal activity, compound 8, an ent-abietane diterpene, was derivatized by introducing nitrogen-containing and aromatic moieties, yielding compounds 9-14. The structures of compounds were characterized by detailed spectroscopic analysis, including 2D NMR experiments (COSY, HMQC/HSQC, HMBC, and NOESY). Compounds 1-14 were evaluated for their MDR-reversing activity on human ABCB1 gene transfected mouse lymphoma cells (L5178Y-MDR) through a combination of functional and chemosensitivity assays. The natural compounds 1-8 were further evaluated on resistant human colon adenocarcinoma cells (Colo320), and, additionally, their cytotoxicity was assessed on noncancerous mouse (NIH/3T3) and human (MRC-5) embryonic fibroblast cell lines. While spiropedroxodiol (1) was found to be a very strong MDR reversal agent in both L5178Y-MDR and Colo320 cells, the chemical modifications of helioscopinolide E (8) at C-3 positively contributed to increase the MDR reversal activity of compounds 10, 12, and 13. Furthermore, in combination assays, compounds 1 and 7-14 enhanced synergistically the cytotoxicity of doxorubicin. Finally, by means of molecular docking, the key residues and binding modes by which compounds 1-14 may interact with a murine P-glycoprotein model were identified, allowing additional insights on the efflux modulation mechanism of these compounds.
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