title: Impact of Ginkgo Biloba Extract EGb 761 on ischemia/reperfusion - induced oxidative stress products formation in rat forebrain.
abstract: Dysbalance in reactive oxygen/nitrogen species is involved in the pathogenesis of cerebral ischemia/reperfusion injury (IRI). Ginkgo biloba extract (Egb 761) pre-treatment was used to observe potential antioxidant/neuroprotective effect after global ischemia/reperfusion. Egb 761 significantly decreased the level of lipoperoxidation (LPO) in rat forebrain total membrane fraction (homogenate) induced by in vitro oxidative stress (Fe(2+)+H(2)O(2)). In animals subjected to four-vessel global ischemia for 15 min and 2-24 h reperfusion the EGb pretreatment slightly decreased LPO in forebrain homogenate. However, as detected in EGb treated group, the LPO-induced lysine conjugates are attenuated in comparison to non-treated IRI animals. EGb significantly improved parameters which indicate forebrain protein oxidative damage after IRI. The intensity of tryptophane fluorescence was increased by the 18.2% comparing to non-treated IRI group and bityrosine fluorescence was significantly decreased in ischemic (21%) and 24 h reperfused (15.9%) group in comparison non-treated IRI group. In addition, the level of total free SH- groups in pre-treated animals was significantly higher comparing to non-treated animals. Our results indicate that extract of EGb 761 has potent antioxidant activity and could play a role to attenuate the IRI-induced oxidative protein modification and lipoperoxidation in the neuroprotective process.
authors.affiliation: Department of Medical Biochemistry, Jessenius Faculty of Medicine, Comenius University, MalaHora 4, SK-03601, Martin, Slovakia.
authors.forename: A
authors.initials: A
authors.lastname: Uríková
authors.forename: E
authors.initials: E
authors.lastname: Babusíková
authors.forename: D
authors.initials: D
authors.lastname: Dobrota
authors.forename: A
authors.initials: A
authors.lastname: Drgová
authors.forename: P
authors.initials: P
authors.lastname: Kaplán
authors.forename: Z
authors.initials: Z
authors.lastname: Tatarková
authors.forename: J
authors.initials: J
authors.lastname: Lehotský
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D002545:Brain Ischemia / Q000378:metabolism* / Q000517:prevention & control; D020441:Ginkgo biloba; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects*; D010936:Plant Extracts / Q000494:pharmacology*; D016548:Prosencephalon / Q000187:drug effects* / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000378:metabolism* / Q000517:prevention & control; D000096983:Ginkgo Extract
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; C063170:Ginkgo biloba extract; D000096983:Ginkgo Extract