title: Targeted proteomics in Alzheimer's disease: focus on amyloid-beta.
abstract: Diagnosis and monitoring of sporadic Alzheimer's disease (AD) have long depended on clinical examination of individuals with end-stage disease. However, upcoming anti-AD therapies are optimally initiated when individuals show very mild signs of neurodegeneration. There is a developing consensus for cerebrospinal fluid amyloid-beta (Abeta) as a core biomarker for the mild cognitive impairment stage of AD. Abeta is directly involved in the pathogenesis of AD or tightly correlated with other primary pathogenic factors. It is produced from amyloid precursor protein (APP) by proteolytic processing that depends on the beta-site APP-cleaving enzyme 1 and the gamma-secretase complex, and is degraded by a broad range of proteases. This review summarizes targeted proteomic studies of Abeta in biological fluids and identifies clinically useful markers of disrupted Abeta homeostasis in AD. The next 5 years will see a range of novel assays developed on the basis of these results. From a longer perspective, establishment of the most effective combinations of different biomarkers and other diagnostic modalities may be foreseen.
authors.affiliation: Institute of Neuroscience & Physiology, Department of Psychiatry & Neurochemistry, The Sahlgrenska Academy at Göteborg University, Mölndal, Sweden. erik.portelius@neuro.gu.se
authors.forename: Erik
authors.initials: E
authors.lastname: Portelius
authors.forename: Henrik
authors.initials: H
authors.lastname: Zetterberg
authors.forename: Johan
authors.initials: J
authors.lastname: Gobom
authors.forename: Ulf
authors.initials: U
authors.lastname: Andreasson
authors.forename: Kaj
authors.initials: K
authors.lastname: Blennow
mesh_terms: D000544:Alzheimer Disease / Q000175:diagnosis*; D016229:Amyloid beta-Peptides / Q000032:analysis*; D015415:Biomarkers; D006801:Humans; D040901:Proteomics / Q000379:methods
chemical_list: D016229:Amyloid beta-Peptides; D015415:Biomarkers