Dóra Rédei

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The antioxidant effects of aqueous methanolic extracts from three medicinal Lamiaceae species were investigated in enzyme-dependent and enzyme-independent lipid peroxidation systems. All these extracts caused a considerable concentration-dependent inhibition of lipid peroxidation. Phenolic components present in the plant extracts were evaluated for(More)
The protective effects of eleven Salvia species native to Europe against enzyme-dependent and enzyme-independent lipid peroxidation were evaluated. The 50% aqueous methanolic extracts of the leaves of all tested plants were found to be more effective than the positive control alpha-tocopherol acid succinate. The extracts of S. candelabrum, S. ringens, S.(More)
Multiple chromatographic separations of the CHCl₃-soluble extract of the roots of Echinacea purpurea led to the isolation of 19 compounds. Four natural products, three alkamides and nitidanin diisovalerianate, were identified, and five further compounds were detected for the first time in this species. Additionally, 10 known E. purpurea metabolites were(More)
The effects of 15 jatrophane diterpene polyesters (1-3 and 5-16) isolated from lipophilic extracts of Euphorbia serrulata, E. esula, E. salicifolia, and E. peplus (Euphorbiaceae) on the reversion of multidrug resistance of mouse lymphoma cells were examined. The structures of five new compounds (1-5) were elucidated by spectroscopic methods, including(More)
The cytotoxicities of nine diterpene polyesters obtained from Euphorbia species were assayed by measuring their effects on the growth of Vero cells. Their antiviral effects on the multiplication of Herpes simplex virus type 2 (HSV-2) were studied by using the virus yield reduction method in cell cultures. With the exception of the strongly cytotoxic(More)
Several macrocyclic diterpenes with jatrophane or lathyrane skeletons were isolated from methanol extracts of Hungarian Euphorbia species and evaluated for multidrug resistance (MDR)-reversing activity on a human colon cancer cell line. MDR-reversing activity was tested by using a standard functional assay with Rhodamine 123 as a fluorescent substrate(More)
Many of the herbal extracts used in the Chinese clinical medical routine inhibit the growth of tumor cells. In the present work, extracts of 12 selected herbs were prepared with methanol, chloroform, ethyl acetate and water, and the effects of these on the multidrug resistance (MDR) and P-glycoprotein of mouse lymphoma cells transfected with the human mdr1(More)
The development of strategies intended to inhibit human cytomegalovirus (HCMV) immediate-early (IE) antigen expression is an important goal in research designed to prevent and treat certain forms of cancer. The aim of this study was to identify potent IE antigen-targeting natural compounds as antitumor promoters in an in vitro model of tumor promotion.(More)
Sixteen new diterpene polyesters were isolated and identified from Hungarian Euphorbiaceae species. Two of them (21, 23) are based on formerly unknown diterpene core. The structures of three jatrophane type diterpene heptaester were elucidated (1, 3, 6), which are diterpenoids with the highest degree of esterification identified from this plant family. Some(More)
The dried aerial parts of Euphorbia mongolica afforded three new acylated polyhydroxy diterpenoids based on the jatrophane framework. The structures were established by means of a combination of 1D and 2D NMR techniques and mass spectrometry as(More)