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  • Portelius, Erik, 1977, et al. (författare)
  • A novel pathway for amyloid precursor protein processing.
  • 2011
  • Ingår i: Neurobiology of aging. - : Elsevier BV. - 1558-1497 .- 0197-4580. ; 32:6, s. 1090-98
  • Tidskriftsartikel (refereegranskat)abstract
    • Amyloid precursor protein (APP) can be proteolytically processed along two pathways, the amyloidogenic that leads to the formation of the 40-42 amino acid long Alzheimer-associated amyloid beta (Abeta) peptide and the non-amyloidogenic in which APP is cut in the middle of the Abeta domain thus precluding Abeta formation. Using immunoprecipitation and mass spectrometry we have shown that Abeta is present in cerebrospinal fluid (CSF) as several shorter isoforms in addition to Abeta1-40 and Abeta1-42. To address the question by which processing pathways these shorter isoforms arise, we have developed a cell model that accurately reflects the Abeta isoform pattern in CSF. Using this model, we determined changes in the Abeta isoform pattern induced by alpha-, beta-, and gamma-secretase inhibitor treatment. All isoforms longer than and including Abeta1-17 were gamma-secretase dependent whereas shorter isoforms were gamma-secretase independent. These shorter isoforms, including Abeta1-14 and Abeta1-15, were reduced by treatment with alpha- and beta-secretase inhibitors, which suggests the existence of a third and previously unknown APP processing pathway involving concerted cleavages of APP by alpha- and beta-secretase.
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