title: Oxyresveratrol and resveratrol are potent antioxidants and free radical scavengers: effect on nitrosative and oxidative stress derived from microglial cells.
abstract: Hydroxystilbenes are naturally occurring polyphenols with protective effects against reactive oxygen and nitrogen species (ROS/RNS). Here, we investigated oxyresveratrol (OXY), which is contained in high amounts in mulberry wood, in comparison to the antioxidant resveratrol (RES). We found that OXY is a more effective scavenger for 2,2-diphenyl-1-picryl-hydrazyl (DPPH, 100 microM) used as a general free radical model, compared to RES or trans-4-hydroxystilbene (IC(50)=28.9, 38.5, and 39.6 microM, respectively). When primary glial cell cultures were loaded with the ROS/RNS-sensitive fluorochrome 2,7-dichlorodihydrofluorescein, the lowest rise in the fluorescence signal after H(2)O(2) exposure was seen when the cells were pretreated with OXY. Using 4,5-diaminofluorescein (DAF-2) to monitor free nitric oxide levels (7.7 microM NO) in a spectrofluorimetric cell-free assay, we found again that OXY (at 5 microM) is a more effective scavenger. Accordingly, cultures of the murine microglial cell line N9 and primary mixed glial cultures were used to test the drug effects of NO production upon expression of the inducible isoform of nitric oxide synthase (iNOS). We found that both compounds considerably diminished NO (nitrite) levels, RES more effectively than OXY (IC(50)=22.36 and 45.31 microM). RES but not OXY down-regulated the expression of iNOS protein, but both did not alter iNOS activity. Furthermore, OXY displayed a generally lower cytotoxicity than RES. The radical and ROS scavenging properties, as well as the lower cytotoxicity towards microglia and the known good water solubility suggest OXY as a potential protectant against ROS/RNS.
authors: Institute for Medical Neurobiology, Otto-von-Guericke University, Leipziger Strasse 44, D-39120, Magdeburg, Germany.
authors: Peter
authors: P
authors: Lorenz
authors: Sanjoy
authors: S
authors: Roychowdhury
authors: Mario
authors: M
authors: Engelmann
authors: Gerald
authors: G
authors: Wolf
authors: Thomas F W
authors: TF
authors: Horn
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000378:metabolism; D015153:Blotting, Western; D002478:Cells, Cultured; D019793:Fluorescein / Q000737:chemistry; D005452:Fluoresceins / Q000737:chemistry; D016166:Free Radical Scavengers / Q000494:pharmacology*; D006834:Hydrazines / Q000378:metabolism; D051379:Mice; D017628:Microglia / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D019001:Nitric Oxide Synthase / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II; D018384:Oxidative Stress / Q000187:drug effects; D010851:Picrates; D010936:Plant Extracts / Q000494:pharmacology*; D051381:Rats; D000077185:Resveratrol; D013050:Spectrometry, Fluorescence; D013267:Stilbenes / Q000494:pharmacology*
chemical_list: C111205:4,5-diaminofluorescein; D000975:Antioxidants; D001713:Biphenyl Compounds; D005452:Fluoresceins; D016166:Free Radical Scavengers; D006834:Hydrazines; D010851:Picrates; D010936:Plant Extracts; D013267:Stilbenes; C034912:puag-haad; C037631:2',7'-dichlorofluorescein; C004931:1,1-diphenyl-2-picrylhydrazyl; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II; C496317:Nos2 protein, mouse; C496318:Nos2 protein, rat; D000077185:Resveratrol; D019793:Fluorescein