Fang Fang1, Geng-tao Liu. 1. Department of Pharmacology, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Abstract
AIM: The aim of the present study was to assess the effects of N-[2-(4-hydroxyphenyl)ethyl]-2-(2,5-dimethoxyphenyl)-3-(3-methoxy-4-hydroxyphenyl) acrylamide (compound FLZ), a novel synthetic analogue of squamosamide, on the dysfunction of rat brain mitochondria induced by Abeta(25-35) in vitro. METHODS: Isolated rat brain mitochondria were incubated with aged Abeta(25-35) for 30 min in the presence and absence of FLZ (1-100 micromol/L). The activities of key mitochondrial enzymes, the production of hydrogen peroxide (H(2)O(2)) and superoxide anion (O2*-), and the levels of glutathione (GSH) in mitochondria were examined. Mitochondrial swelling and the release of cytochrome c from mitochondria were assessed by biochemical and Western blot methods, respectively. RESULTS: Incubation of mitochondria with aged Abeta(25-35) inhibited the activities of alpha-ketoglutarate dehydrogenase (alpha-KGDH), pyruvate dehydrogenase (PDH) and respiratory chain complex IV. It also resulted in increased H(2)O(2) and (O2*-) production, and decreased the GSH level in mitochondria. Furthermore, it induced mitochondrial swelling and cytochrome c release from the mitochondria. The addition of FLZ (100 micromol/L) prior to treatment with Abeta(25-35) significantly prevented these toxic effects of Abeta(25-35) on the mitochondria. CONCLUSION: FLZ has a protective effect against Abeta(25-35)-induced mitochondrial dysfunction in vitro.
AIM: The aim of the present study was to assess the effects of N-[2-(4-hydroxyphenyl)ethyl]-2-(2,5-dimethoxyphenyl)-3-(3-methoxy-4-hydroxyphenyl) acrylamide (compound FLZ), a novel synthetic analogue of squamosamide, on the dysfunction of rat brain mitochondria induced by Abeta(25-35) in vitro. METHODS: Isolated rat brain mitochondria were incubated with aged Abeta(25-35) for 30 min in the presence and absence of FLZ (1-100 micromol/L). The activities of key mitochondrial enzymes, the production of hydrogen peroxide (H(2)O(2)) and superoxide anion(O2*-), and the levels of glutathione (GSH) in mitochondria were examined. Mitochondrial swelling and the release of cytochrome c from mitochondria were assessed by biochemical and Western blot methods, respectively. RESULTS: Incubation of mitochondria with aged Abeta(25-35) inhibited the activities of alpha-ketoglutarate dehydrogenase (alpha-KGDH), pyruvate dehydrogenase (PDH) and respiratory chain complex IV. It also resulted in increased H(2)O(2) and (O2*-) production, and decreased the GSH level in mitochondria. Furthermore, it induced mitochondrial swelling and cytochrome c release from the mitochondria. The addition of FLZ (100 micromol/L) prior to treatment with Abeta(25-35) significantly prevented these toxic effects of Abeta(25-35) on the mitochondria. CONCLUSION:FLZ has a protective effect against Abeta(25-35)-induced mitochondrial dysfunction in vitro.
Authors: S M Khan; D S Cassarino; N N Abramova; P M Keeney; M K Borland; P A Trimmer; C T Krebs; J C Bennett; J K Parks; R H Swerdlow; W D Parker; J P Bennett Journal: Ann Neurol Date: 2000-08 Impact factor: 10.422
Authors: Paula I Moreira; Maria S Santos; António Moreno; A Cristina Rego; Catarina Oliveira Journal: J Neurosci Res Date: 2002-07-15 Impact factor: 4.164
Authors: K Hirai; G Aliev; A Nunomura; H Fujioka; R L Russell; C S Atwood; A B Johnson; Y Kress; H V Vinters; M Tabaton; S Shimohama; A D Cash; S L Siedlak; P L Harris; P K Jones; R B Petersen; G Perry; M A Smith Journal: J Neurosci Date: 2001-05-01 Impact factor: 6.167