- Lathyrol diterpenes as modulators of P-glycoprotein dependent multidrug resistance: Structure-activity relationship studies on Euphorbia factor L3 derivatives
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Five series of 37 new acylate and epoxide derivatives (3-39) of Euphorbia factor L3, a lathyrol diterpene isolated from Euphorbia lathyris, were designed by modifying the hydroxyl moiety of C-3, C-5, or C-15. Chemoreversal effects of the acylat
- Jiao, Wei,Wan, Zhongmin,Chen, Shuang,Lu, Runhua,Chen, Xiaozhen,Fang, Dongmei,Wang, Jiufeng,Pu, Shengcai,Huang, Xin,Gao, Haixiang,Shao, Huawu
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- Lathyrol and epoxylathyrol derivatives: Modulation of Cdr1p and Mdr1p drug-efflux transporters of Candida albicans in Saccharomyces cerevisiae model
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Macrocyclic diterpenes were previously found to be able to modulate the efflux pump activity of Candida albicans multidrug transporters. Most of these compounds were jatrophanes, but only a few number of lathyrane-type diterpenes was evaluated. Therefore, the aim of this study was to evaluate the ability of nineteen structurally-related lathyrane diterpenes (1–19) to overcome the drug-efflux activity of Cdr1p and Mdr1p transporters of C. albicans, and get some insights on their structure-activity relationships. The transport assay was performed by monitoring Nile Red (NR) efflux in a Saccharomyces cerevisiae strain overexpressing the referred efflux pumps from C. albicans. Moreover, a chemosensitization assay was performed in order to evaluate the type of interaction between the inhibitory compounds and the antifungal drug fluconazole. Compounds 1–13 were previously isolated from Euphorbia boetica or obtained by derivatization, and compounds 14–19 were prepared by chemical transformations of compound 4. In the transport assays, compounds 14–19 revealed the strongest inhibitory activity of the Cdr1p efflux pump, ranging from 65 to 85%. Concerning Mdr1p efflux pump, the most active compounds were 1, 3, 6, 8, and 12 (75–85%). When used in combination with fluconazole, epoxyboetirane K (2) and euphoboetirane N (18) revealed synergistic effects in the AD-CDR1 yeast strain, overexpressing the Cdr1p transporter, through their ability to reduce the effective concentration of the antifungal drug by 23- and 52-fold, respectively.
- Mónico, Andreia,Nim, Shweta,Duarte, Noélia,Rawal, Manpreet Kaur,Prasad, Rajendra,Di Pietro, Attilio,Ferreira, Maria-José U.
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- Effective MDR reversers through phytochemical study of Euphorbia boetica
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Introduction: Macrocyclic diterpenes from Euphorbia species were found to be promising modulators of multidrug resistance (MDR), a complex phenomenon that hampers the effectiveness of cancer therapy. Objective: To find new effective MDR reversers through
- Neto, Sara,Duarte, Noélia,Pedro, Cecília,Spengler, Gabriella,Molnár, Joséph,Ferreira, Maria-José U.
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- Lathyrane Diterpenoids as Novel hPXR Agonists: Isolation, Structural Modification, and Structure-Activity Relationships
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Pregnane X receptor (PXR) that orchestrates the intricate network of xeno- and endobiotic metabolism is considered as a promising therapeutic target for cholestasis. In this study, the human PXR (hPXR) agonistic bioassay-guided isolation of Euphorbia lathyris followed by the structural modification led to the construction of a lathyrane diterpenoid library (1-34). Subsequent assay of this library led to the identification of a series of potent hPXR agonists, showing better efficacy than that of typical hPXR agonist, rifampicin. The most active compound, 8, could dose-dependently activate hPXR at micromolar concentrations and significantly up-regulate the expressions of PXR downstream genes CYP3A4, CYP2B6, and MDR1. The structure-activity relationships (SARs) studied in combination with molecular modeling suggested that acyloxy at C-7 and the presence of 14-carbonyl were essential to the activity. These findings suggested that lathyrane diterpenoids could serve as a new type of hPXR agonist for future anticholestasis drug development.
- Huang, Dong,Wang, Rui-Min,Li, Wei,Zhao, Ying-Yuan,Yuan, Fang-Yu,Yan, Xue-Long,Chen, Ye,Tang, Gui-Hua,Bi, Hui-Chang,Yin, Sheng
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- Synthesis of lathyrane diterpenoid nitrogen-containing heterocyclic derivatives and evaluation of their anti-inflammatory activities
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As our ongoing work on lathyrane diterpenoid derivatization, three series of lathyrane diterpenoid derivatives were designed and synthesized based combination principles, including pyrazole, thiazole and furoxan moieties. Biological evaluation indicated t
- Wang, Wang,Xiong, Liangliang,Li, Yutong,Song, Zhuorui,Sun, Dejuan,Li, Hua,Chen, Lixia
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- Diterpenoids from Euphorbia pithyusa subsp. cupanii
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The aerial parts of Euphorbia pithyusa subsp, cupanii collected in Sardinia afforded eleven novel diterpenoids belonging to the lathyrane (1a), premyrsinane (4a-g), and tigliane (5a-c) types. Compounds 4a-g and 5a are esters of two new parent alcohols, na
- Appendino, Giovanni,Belloro, Emanuela,Tron, Gian Cesare,Jakupovic, Jasmin,Ballero, Mauro
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p. 1399 - 1404
(2007/10/03)
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