Controlling Amyloid-beta Peptide(1-42) Oligomerization and Toxicity by Fluorinated Nanoparticles

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Ana M Saraiva (Autor) Outra; Isabel Cardoso (Autor) Outra; Carmo Pereira, MC (Autor) FEUP; Manuel A N Coelho (Autor) FEUP; Maria J Joao Saraiva (Autor) ICBAS; Helmuth Moehwald (Autor) Outra; Gerald Brezesinski (Autor) Outra

Revista

Título: ChemBioChem

Vol. 11

Páginas: 1905-1913

ISSN: 1439-4227

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 32 Citações

Scopus - 24 Citações

Classificação Científica

FOS: Ciências médicas e da saúde > Medicina básica

Outras Informações

ID Authenticus: P-003-2XW

DOI: 10.1002/cbic.201000237

Abstract (EN): The amyloid-p peptide (A beta) is a major fibrillar component of neuritic plaques in Alzheimer's disease brains and is related to the pathogenesis of the disease. Soluble oligomers that precede fibril formation have been proposed as the main neurotoxic species that contributes to neurodegeneration and dementia. We hypothesize that oligomerization and cytotoxicity can be repressed by nanoparticles (NPs) that induce conformational changes in A beta 42. We show here that fluorinated and hydrogenated NPs with different abilities to change A beta 42 conformation influence oligomerization as assessed by atomic force microscopy, immunoblot and SDS-PAGE. Fluorinated NPs, which promote an increase in alpha-helical content, exert an antioligomeric effect, whereas hydrogenated analogues do not and lead to aggregation. Cytotoxicity assays confirmed our hypothesis by indicating that the conformational conversion of A beta 42 into an a-helical-enriched secondary structure also has antiapoptotic activity, thereby increasing the viability of cells treated with oligomeric species.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9