Identification of low molecular weight pyroglutamate A{beta} oligomers in Alzheimer disease: a novel tool for therapy and diagnosis.

Abstract

N-terminally truncated Aβ peptides starting with pyroglutamate (AβpE3) represent a major fraction of all Aβ peptides in the brain of Alzheimer disease (AD) patients. AβpE3 has a higher aggregation propensity and stability and shows increased toxicity compared with full-length Aβ. In the present work, we generated a novel monoclonal antibody (9D5) that selectively recognizes oligomeric assemblies of AβpE3 and studied the potential involvement of oligomeric AβpE3 in vivo using transgenic mouse models as well as human brains from sporadic and familial AD cases. 9D5 showed an unusual staining pattern with almost nondetectable plaques in sporadic AD patients and non-demented controls. Interestingly, in sporadic and familial AD cases prominent intraneuronal and blood vessel staining was observed. Using a novel sandwich ELISA significantly decreased levels of oligomers in plasma samples from patients with AD compared with healthy controls were identified. Moreover, passive immunization of 5XFAD mice with 9D5 significantly reduced overall Aβ plaque load and AβpE3 levels, and normalized behavioral deficits. These data indicate that 9D5 is a therapeutically and diagnostically effective monoclonal antibody targeting low molecular weight AβpE3 oligomers.

• Authors: Oliver Wirths, Christian Erck, Henrik Martens, Anja Harmeier, Constanze Geumann, Sadim Jawhar, Sathish Kumar, Gerd Multhaup, Jochen Walter, Martin Ingelsson, Malin Degerman-Gunnarsson, Hannu Kalimo, Inge Huitinga, Lars Lannfelt, Thomas A Bayer
• Journal: The Journal of biological chemistry (J Biol Chem) Vol. 285 Issue 53 Pg. 41517-24 (Dec 31 2010) ISSN: 1083-351X [Electronic] United States
• PMID: 20971852 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Amyloid
• Pyrrolidonecarboxylic Acid

Topics

• Alzheimer Disease (metabolism)
• Amyloid (chemistry)
• Animals
• Behavior, Animal
• Brain (metabolism)
• Cell Line, Tumor
• Chromatography (methods)
• Enzyme-Linked Immunosorbent Assay (methods)
• Humans
• Immunochemistry (methods)
• Mice
• Mice, Inbred C57BL
• Mice, Transgenic
• Molecular Weight
• Protein Structure, Tertiary
• Pyrrolidonecarboxylic Acid (chemistry)
• Transgenes