TY  - JOUR
AU  - Zampar, S.
AU  - Klafki, H. W.
AU  - Sritharen, K.
AU  - Bayer, T. A.
AU  - Wiltfang, J.
AU  - Rostagno, A.
AU  - Ghiso, J.
AU  - Miles, L. A.
AU  - Wirths, O.
TI  - N-terminal heterogeneity of parenchymal and vascular amyloid-β deposits in Alzheimer's disease.
JO  - Neuropathology & applied neurobiology
VL  - 46
IS  - 7
SN  - 1365-2990
CY  - Oxford [u.a.]
PB  - Wiley-Blackwell
M1  - DZNE-2021-00141
SP  - 673 - 685
PY  - 2020
N1  - ISSN 1365-2990 not unique: **3 hits**.
AB  - The deposition of amyloid-β (Aβ) peptides in the form of extracellular plaques in the brain represents one of the classical hallmarks of Alzheimer's disease (AD). In addition to 'full-length' Aβ starting with aspartic acid (Asp-1), considerable amounts of various shorter, N-terminally truncated Aβ peptides have been identified by mass spectrometry in autopsy samples from individuals with AD.Selectivity of several antibodies detecting full-length, total or N-terminally truncated Aβ species has been characterized with capillary isoelectric focusing assays using a set of synthetic Aβ peptides comprising different N-termini. We further assessed the N-terminal heterogeneity of extracellular and vascular Aβ peptide deposits in the human brain by performing immunohistochemical analyses using sporadic AD cases with antibodies targeting different N-terminal residues, including the biosimilar antibodies Bapineuzumab and Crenezumab.While antibodies selectively recognizing Aβ1-x showed a much weaker staining of extracellular plaques and tended to accentuate cerebrovascular amyloid deposits, antibodies detecting Aβ starting with phenylalanine at position 4 of the Aβ sequence showed abundant amyloid plaque immunoreactivity in the brain parenchyma. The biosimilar antibody Bapineuzumab recognized Aβ starting at Asp-1 and demonstrated abundant immunoreactivity in AD brains.In contrast to other studied Aβ1-x -specific antibodies, Bapineuzumab displayed stronger immunoreactivity on fixed tissue samples than with sodium dodecyl sulfate-denatured samples on Western blots. This suggests conformational preferences of this antibody. The diverse composition of plaques and vascular deposits stresses the importance of understanding the roles of various Aβ variants during disease development and progression in order to generate appropriate target-developed therapies.
KW  - Aged
KW  - Aged, 80 and over
KW  - Alzheimer Disease: metabolism
KW  - Amyloid beta-Peptides: metabolism
KW  - Animals
KW  - Antibodies, Monoclonal, Humanized: pharmacology
KW  - Brain: metabolism
KW  - Disease Models, Animal
KW  - Humans
KW  - Peptide Fragments: metabolism
KW  - Plaque, Amyloid: metabolism
KW  - Abeta (Other)
KW  - Alzheimer disease (Other)
KW  - N-terminal truncation (Other)
KW  - amyloid (Other)
KW  - antibody (Other)
KW  - capillary isoelectric focusing immunoassay (Other)
LB  - PUB:(DE-HGF)16
C2  - pmc:PMC8082844
C6  - pmid:32497293
DO  - DOI:10.1111/nan.12637
UR  - https://pub.dzne.de/record/154287
ER  -