English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/17955
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Neuroprotective effect of H. perforatum extracts on β-amyloid-induced neurotoxicity

AutorSilva, Bruno A.; Dias, Alberto C. P.; Ferreres, Federico ; Malva, João O.; Oliveira, Catarina R.
Palabras claveAlzheimer’s disease
Hypericum perforatum
Amyloid β(25–35)
Hippocampal neurons
Fecha de publicaciónene-2004
CitaciónNeurotoxicity Research 6(2): 119-130 (2004)
ResumenIn the present study we assessed the neuroprotective role of aHypericum perforatum ethanolic extract and obtained fractions in amyloid-β peptide (Aβ)(25–35)-induced cell death in rat cultured hippocampal neurons. Lipid peroxidation was used as a marker of oxidative stress by following the formation of TBARS in rat cortical synaptosomes, after incubation with ascorbate/Fe2+, alone or in the presence of EC97 effective concentrations ofH. perforatum fractions. Induced lipid peroxidation was significantly inhibited by fractions containing flavonol glycosides, flavonol and biflavone aglycones, and by a fraction containing several phenols, mainly chlorogenic acid-type phenolics (21%,77%and 98%, respectively). Lipid peroxidation evaluated after incubation with 25 μM Aβ(25–35), was significantly inhibited byH. perforatum extract. Cell viability was assessed by use of the Syto-13/PI assay. The total ethanolic extract (TE) and fractions containing flavonol glycosides, flavonol and biflavone aglycones, reduced Aβ(25–35)-induced cell death (65%,58%and 59%,respectively). These results were further supported by morphological analysis of cells stained with cresyl violet. Peptide β-amyloid(25–35) induced a decrease in cell volume, chromatin condensation and nuclear fragmentation, alterations not evident in the presence of the TE and fractions containing hypericins (hypericin concentration = 11.02 μM), or fractions containing flavonoids (quercetin concentration = 21.13 μM). Dendritic lesion,an evidence of neurodegeneration, was observed by neuronal staining with cobalt following insult with Aβ(25–35), but prevented after exposure to the peptide plus the fractions referred above. The results of the present paper suggest thatH. perforatum extracts may be endowed with neuroprotective compounds able to prevent Aβ(25–35)-induced toxicity.
Descripción12 pages, 6 figures, 1 table.
Versión del editorhttp://dx.doi.org/10.1007/BF03033214
Aparece en las colecciones: (CEBAS) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.