title: [Beta-amyloid protein: recent progress in basic research and therapeutic approaches].
abstract: Deposition of amyloid beta protein (A beta) as senile plaques or cerebrovascular amyloid characterizes the brains of patients with Alzheimer's disease (AD). A beta are composed of 40-42 amino acids that are proteolytically produced from its precursor beta APP. We have shown that the deposition of A beta ending at the 42nd residue (A beta 42) is one of the earliest pathological changes in AD brains. Genetic and cell biological evidence strongly suggests that mutations in beta APP or presenilin (PS) 1 and 2 genes cause AD through increase in production of A beta 42. Recently. PS1 and PS2 are shown to be the catalytic subunits of gamma-secretase that cleaves the intramembrane segments of beta APP and Notch. beta-amyloid hypothesis that emphasizes the primacy of A beta in the pathogenesis of AD is currently being verified by the new experimental therapeutic approaches, e.g., A beta vaccine therapy or administration of inhibitors of beta- or gamma-secretases.
authors.affiliation: Department of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, University of Tokyo.
authors.forename: T
authors.initials: T
authors.lastname: Iwatsubo
mesh_terms: D000544:Alzheimer Disease / Q000209:etiology* / Q000628:therapy; D023582:Alzheimer Vaccines / Q000627:therapeutic use; D053829:Amyloid Precursor Protein Secretases; D016229:Amyloid beta-Peptides / Q000378:metabolism; D016564:Amyloid beta-Protein Precursor / Q000235:genetics / Q000378:metabolism; D016282:Aspartic Acid Endopeptidases; D001921:Brain / Q000378:metabolism; D010450:Endopeptidases; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D053764:Presenilin-1; D053766:Presenilin-2; D051880:Receptors, Notch
chemical_list: D023582:Alzheimer Vaccines; D016229:Amyloid beta-Peptides; D016564:Amyloid beta-Protein Precursor; D008565:Membrane Proteins; C508853:PSEN1 protein, human; C508861:PSEN2 protein, human; D053764:Presenilin-1; D053766:Presenilin-2; D051880:Receptors, Notch; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human