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Volume 271, Number 34, Issue of August 23, 1996 pp. 20631-20635
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

Morphology and Toxicity of Abeta -(1-42) Dimer Derived from Neuritic and Vascular Amyloid Deposits of Alzheimer's Disease

(Received for publication, April 29, 1996, and in revised form, June 10, 1996)

Alex E. Roher Dagger , Michael O. Chaney , Yu-Min Kuo Dagger , Scott D. Webster Dagger , W. Blaine Stine par , Lanny J. Haverkamp '' , Amina S. Woods ''' , Robert J. Cotter ''' , James M. Tuohy Dagger , Grant A. Krafft par , Barry S. Bonnell # and Mark R. Emmerling par par

From the Dagger  Haldeman Laboratory for Alzheimer's Disease Research, Sun Health Research Institute, Sun City, Arizona 85372,  Biotechnology Core, Eli Lilly Research Laboratories, Indianapolis, Indiana 46285, the par  Department of Cellular and Microscopic Research, Abbott Laboratories, Abbott Park, Illinois 60064, the '' Alzheimer's Disease Research Center, Department of Neurology, Baylor College of Medicine, Houston, Texas 77030, the ''' Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, the par  Department of Molecular Pharmacology and Biological Sciences, Northwestern University Medical School, Chicago, Illinois 60611, the # Department of Zoology, Arizona State University, Tempe, Arizona 85287, and the par  par  Parke Davis Co., Ann Arbor, Michigan 48106

In the course of analyzing the chemical composition of Alzheimer's disease neuritic and vascular amyloid, we have purified stable dimeric and trimeric components of Abeta peptides. These peptides (molecular mass 9.0 and 13.5 kDa) were separated by size exclusion chromatography in the presence of 80% formic acid or 5 M guanidine thiocyanate, pH 7.4. The average ratio of monomers, dimers, and trimers was 55:30:15, respectively. Similar structures were produced over time upon incubation of synthetic Abeta -(1-42) at pH 7.4. The stability of these oligomeric forms was also demonstrated by Western blot and mass spectrometry. Atomic force microscopy and electron microscopy rotary shadowing revealed that the monomers polymerized into 8-10-nm filaments, whereas the dimers generated prolate ellipsoids measuring 3-4 nm in diameter. The pathogenic effects of the dimeric Abeta -(1-40/42) were tested in cultures of rat hippocampal neuron glia cells. Only in the presence of microglia did the dimer elicit neuronal killing. It is possible that these potentially pathogenic Abeta -(1-40/42) dimers and trimers from Alzheimer's disease amyloid represent the soluble oligomers of Abeta recently described in Alzheimer's disease brains (Kuo, Y.-M., Emmerling, M. R., Vigo-Pelfrey, C., Kasunic, T. C., Kirkpatrick, J. B., Murdoch, G. H., Ball, M. J., and Roher, A. E. (1996) J. Biol. Chem., 271, 4077-4081).


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