title: G-protein alpha-subunit levels in hippocampus and entorhinal cortex of brains staged for Alzheimer's disease neurofibrillary and amyloid pathologies.
abstract: G-protein alpha-subunits (Galphao, Galphai, Galphas, Galphaq) and adenylyl cyclase (AC) I and II isoforms were quantified in hippocampus and entorhinal cortex from 22 cases staged for Alzheimer's disease (AD) pathologies according to Braak and Braak. Hippocampal Galphai levels declined significantly with neurofibrillary staging, whereas AC I levels in this region increased. Significant amyloid stage-related reductions of Galphai were seen in both the hippocampus and entorhinal cortex. The hippocampus also showed a significant reduction of Galphao with amyloid staging. It is concluded that levels of inhibitory G-protein subunits Galphao, and in particular Galphai, decrease in parallel to the extent of AD pathology.
authors.affiliation: Neurotec Department, Division of Experimental Geriatrics, Karolinska Institutet, Novum, KFC, S-141 86 Huddinge, Sweden.
authors.forename: Angela
authors.initials: A
authors.lastname: García-Jiménez
authors.forename: Johan
authors.initials: J
authors.lastname: Fastbom
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Ohm
authors.forename: Richard F
authors.initials: RF
authors.lastname: Cowburn
mesh_terms: D000293:Adolescent; D000328:Adult; D000544:Alzheimer Disease / Q000378:metabolism* / Q000473:pathology*; D001923:Brain Chemistry / Q000502:physiology*; D002648:Child; D004591:Electrophoresis, Polyacrylamide Gel; D018728:Entorhinal Cortex / Q000378:metabolism* / Q000473:pathology*; D005260:Female; D044385:GTP-Binding Protein alpha Subunits / Q000378:metabolism*; D006624:Hippocampus / Q000378:metabolism* / Q000473:pathology*; D006801:Humans; D015151:Immunoblotting; D008297:Male; D016874:Neurofibrillary Tangles / Q000473:pathology*; D058225:Plaque, Amyloid / Q000473:pathology*
chemical_list: D044385:GTP-Binding Protein alpha Subunits