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In Vitro Antioxidant and Free Radical Scavenging Activity of Cyperus rotundus
R. Yazdanparast,A. Ardestani 한국식품영양과학회 2007 Journal of medicinal food Vol.10 No.4
Cyperus rotundus(Family Cyperaceae) is used both as a functional food and as a drug. IIn this study, the an-tioxidative potential of a hydroalcoholic extract of C. rotundus(CRE) was evaluated by various antioxidant assays, includingantioxidant capacity by the phosphomolybdenum method, total antioxidant activity in linoleic acid emulsion systems, 1,1-diphenyl-2-picrylhydrazyl (DPPH), superoxide, hydroxyl radicals, and nnitric oxide (NO) scavenging. We further evaluated thereducing potential of the extract as well as Fe2. /ascorbate-induced lipid peroxidation in rat liver homogenate. These varriousantioxidant activities were compared to standard antioxidants such as buutylated hydroxytoluene, tocopherol, L-ascorbic acid,and catechin. Total phenolic and flavonoid content of CRE was also deterrmined by a colorimetric method. The extract ex-hibited high reduction capability and powerful free radical scavenging, especially against DPPH and superoxide anions aswell as a moderate effect on NO. CRE also showed inhibited lipid peroxiddation in rat liver homogenate induced by Fe2. /ascor-bate and prevented deoxyribose degradation in both nonsite-specific and site-specific assays showing the hydroxyl radicalscavenging and metal chelating activity of the hydroalcoholic extract. MMoreover, the peroxidation inhibiting activity of CREwas demonstrated in the linoleic acid emulsion system. These results cleearly established the antioxidative potency of C. ro-tundus, which may account for some of the medical claims attributed to this pllant.
Gnidilatimonoein from Daphne mucronata Induces Differentiation and Apoptosis in Leukemia Cell Lines
Mahdavi, Majid,Yazdanparast, Razieh 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.2
Gnidilatimonoein is a new diterpene ester, recently isolated from the leaves of Daphne macronata with potent anti-tumoral and anti-metastastic activities (Yazdanparast et al., 2004). Promyeloblastic (KG1), promyelocytic (NB4) and promonocytic (U937) cells were cultured in the presence of various concentrations of the drug (0.5-3.0 ${\mu}$M) for 3 days. Herein, we report that gnidilatimonoein induces differentiation and apoptosis in KG1 , NB4 and U937 cells. The drug inhibited growth and proliferation of KG1 , NB4 and U937 cells with IC50 values of 1.5, 1.5 and 1.0 ${\mu}$M, respectively, after 72 h of treatment. Cell viability was also decreased by 18%, 20% and 23%, respectively, after 72 h treatment with the drug. NBT reducing assay revealed that the inhibition of proliferation is associated with differentiation especially toward monocytes-like morphology. Indeed, the drug at 0.5-15 ${\mu}$M induced differentiation by 5-50% in the cells. Acridine orange/ethidium bromide (AO/EtBr) double staining and DNA fragmentation assays revealed that apoptosis occurred after differentiation of the cells. Based on the present data, it seems that the new compound is a good candidate for further evaluation as an effective chemotherapeutic agent acting through induction of differentiation and apoptosis.
Gnidilatimonoein from Daphne mucronata Induces Differentiation and Apoptosis in Leukemia Cell Lines
Majid Mahdavi,Razieh Yazdanparast 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.2
Gnidilatimonoein is a new diterpene ester, recently isolated from the leaves of Daphne macronata with potent anti-tumoral and anti-metastastic activities (Yazdanparast et al., 2004). Promyeloblastic (KG1), promyelocytic (NB4) and promonocytic (U937) cells were cultured in the presence of various concentrations of the drug (0.5-3.0 µM) for 3 days. Herein, we report that gnidilatimonoein induces differentiation and apoptosis in KG1, NB4 and U937 cells. The drug inhibited growth and proliferation of KG1, NB4 and U937 cells with IC50 values of 1.5, 1.5 and 1.0 µM, respectively, after 72 h of treatment. Cell viability was also decreased by 18%, 20% and 23%, respectively, after 72 h treatment with the drug. NBT reducing assay revealed that the inhibition of proliferation is associated with differentiation especially toward monocytes-like morphology. Indeed, the drug at 0.5-1.5 µM induced differentiation by 5-50% in the cells. Acridine orange/ethidium bromide (AO/EtBr) double staining and DNA fragmentation assays revealed that apoptosis occurred after differentiation of the cells. Based on the present data, it seems that the new compound is a good candidate for further evaluation as an effective chemotherapeutic agent acting through induction of differentiation and apoptosis.
Meshkini, Azadeh,Yazdanparast, Razieh Korean Society for Biochemistry and Molecular Biol 2007 Journal of biochemistry and molecular biology Vol.40 No.6
3-Hydrogenkwadaphnin (3-HK) is a daphnane-type diterpene ester isolated from Dendrostellera lessertii (Thymelaeaceae) with high differentiation and apoptotic potency in leukemic cells without any measurable adverse effects on normal cells (Moosavi et al., 2005b). In this study, we report that 3-HK (12 nM) has the ability to cease proliferation, induce differentiation and apoptosis in chronic myelogenous leukemia (CML) K562 cell line. The treated cells lost erythroid properties and differentiated along the megakaryocytic lineage based on the morphological features apparent after Wright-Giemsa staining, DNA content analysis and the expression of cell surface marker glycoprotein IIb as analyzed by flow cytometry. Moreover, using Hoechst 33258 and Annexin V double staining indicated the occurrence of apoptosis among the treated cells. On the other hand, restoration of the depleted GTP pool size by exogenous addition of guanosine ($50{\mu}M$) reduced the effect of the drug regarding the extent of differentiation while no further enhancement of 3-HK effect was obtained by addition of exogenous hypoxanthine ($100{\mu}M$). These interesting results necessitate further investigation regarding the mechanism of action of this unique anti-leukemic agent.
Antioxidant Efficacy of Nasturtium officinale Extracts Using Various In Vitro Assay Systems
Seifollah Bahramikia,Razieh Yazdanparast 사단법인약침학회 2010 Journal of Acupuncture & Meridian Studies Vol.3 No.4
Nasturtium officinale R. Br. (watercress), of the family Brassicaceae, has been long used as a home remedy or a medicinal plant by the people of southeastern Iran. The aim of this study was to investigate the antioxidant activity of N. officinale extract using various in vitro assay systems, including the ferric reducing antioxidant power and 2,2-azinobis(3-ethylbenzothiazoline-6-sulfonate) assays, 1,1-diphenyl-2-picrylhydrazyl, hydrogen peroxide, nitric oxide radical scavenging, and ferrous ion chelating activity, as well as the inhibitory effect on ferrous ion/ascorbate induced lipid peroxidation, in rat liver homogenate. The results revealed that N. officinale extract possesses potent reducing power in a ferric reducing antioxidant power assay, concentration-dependent scavenging ability on 2,2-azinobis 3-ethylbenzothiazoline-6-sulfonate, 1,1-diphenyl-2-picrylhydrazyl, nitric oxide radicals,and hydrogen peroxide, as well as chelating ability on ferrous ions. Furthermore,N. officinale extract prevented thiobarbituric acid reactive substances formation in ferrous ion/ascorbate induced lipid peroxidation in rat liver homogenate in a dosedependent manner. In addition, this N. officinale extract had the phenolic and flavonoid contents of 96.2 mg gallic acid equivalents/g dried extract and 63.2 mg catechin equivalents/g dried extract, respectively. The cumulative results clearly indicate that N. officinale extract possesses potent antioxidant properties probably mediated through direct trapping of free radicals, reducing power, and also through metal chelating. Based on its antioxidative potential, N. officinale extract might find applications in the prevention of free radical-related diseases.