Alpha-helix targeting reduces amyloid-beta peptide toxicity

Proc Natl Acad Sci U S A. 2009 Jun 9;106(23):9191-6. doi: 10.1073/pnas.0810364106. Epub 2009 May 20.


The amyloid-beta peptide (Abeta) can generate cytotoxic oligomers, and their accumulation is thought to underlie the neuropathologic changes found in Alzheimer's disease. Known inhibitors of Abeta polymerization bind to undefined structures and can work as nonspecific aggregators, and inhibitors that target conformations that also occur in larger Abeta assemblies may even increase oligomer-derived toxicity. Here we report on an alternative approach whereby ligands are designed to bind and stabilize the 13-26 region of Abeta in an alpha-helical conformation, inspired by the postulated Abeta native structure. This is achieved with 2 different classes of compounds that also reduce Abeta toxicity to cells in culture and to hippocampal slice preparations, and that do not show any nonspecific aggregatory properties. In addition, when these inhibitors are administered to Drosophila melanogaster expressing human Abeta(1-42) in the central nervous system, a prolonged lifespan, increased locomotor activity, and reduced neurodegeneration is observed. We conclude that stabilization of the central Abeta alpha-helix counteracts polymerization into toxic assemblies and provides a strategy for development of specific inhibitors of Abeta polymerization.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amyloid / metabolism*
  • Amyloid beta-Peptides / antagonists & inhibitors*
  • Amyloid beta-Peptides / chemistry*
  • Amyloid beta-Peptides / genetics
  • Amyloid beta-Peptides / metabolism
  • Animals
  • Animals, Genetically Modified
  • Drosophila melanogaster
  • Humans
  • Models, Molecular
  • Peptide Fragments / antagonists & inhibitors*
  • Peptide Fragments / chemistry*
  • Peptide Fragments / genetics
  • Peptide Fragments / metabolism
  • Protein Structure, Secondary


  • Amyloid
  • Amyloid beta-Peptides
  • Peptide Fragments
  • amyloid beta-protein (1-42)