title: Serum β-amyloid peptide levels spike in the early stage of Alzheimer-like plaque pathology in an APP/PS1 double transgenic mouse model.
abstract: Serum levels of β-amyloid (Aβ) peptides may represent an early biomarker in the diagnosis of Alzheimer's disease (AD). In the present study, we investigated the temporal kinetic changes in the levels of serum Aβ 1-42 and 40 in an amyloid precursor protein (APP)/presenilin (PS)1 double transgenic mouse model of AD. Serum Aβ peptide levels in 2-, 3-, 6-, 9- and 18-month old, and liver Aβ 1-40 level in 6-month old mice were measured using enzyme-linked immunosorbent assay (ELISA) kits. Results revealed that serum Aβ levels peaked in 3-month old transgenic mice, and the Aβ level in non-transgenic and transgenic mice is comparable in liver. Compared to the 6-month old transgenic mice, Congo red staining showed that the 3-month old transgenic mice had minimum brain Aβ plaques, corresponding to the early stage of Alzheimer-like plaque pathology, and confocal microscope images showed that the deposition of Aβ in their cerebral vessels was minimal. Furthermore, results of the water maze test, showed that memory was normal for the 3- month old transgenic mice when compared to age-matched non-transgenic mice. These results suggest that serum Aβ peptide levels may be peaked during the early stage of AD. Monitoring serum Aβ peptide levels in the potential AD population may provide an early diagnosis of AD prior to the appearance of clinical symptoms.
authors.affiliation: First Affiliated Hospital, Henan University, 357 Ximen Street, Kaifeng, Henan 475001, PR China. hejue2002@hotmail.com.
authors.forename: Jue
authors.initials: J
authors.lastname: He
authors.forename: Jin-Ping
authors.initials: JP
authors.lastname: Qiao
authors.forename: Shenghua
authors.initials: S
authors.lastname: Zhu
authors.forename: Mengzhou
authors.initials: M
authors.lastname: Xue
authors.forename: Wenwu
authors.initials: W
authors.lastname: Chen
authors.forename: Xinchun
authors.initials: X
authors.lastname: Wang
authors.forename: Adrien
authors.initials: A
authors.lastname: Tempier
authors.forename: Qingjun
authors.initials: Q
authors.lastname: Huang
authors.forename: Jiming
authors.initials: J
authors.lastname: Kong
authors.forename: Xin-Min
authors.initials: XM
authors.lastname: Li
mesh_terms: D000544:Alzheimer Disease / Q000097:blood* / Q000175:diagnosis* / Q000235:genetics; D016229:Amyloid beta-Peptides / Q000097:blood*; D016564:Amyloid beta-Protein Precursor / Q000235:genetics; D000818:Animals; D015415:Biomarkers / Q000097:blood; D001921:Brain / Q000473:pathology*; D004195:Disease Models, Animal; D018450:Disease Progression; D042241:Early Diagnosis; D018782:Maze Learning; D051379:Mice; D008822:Mice, Transgenic; D058225:Plaque, Amyloid / Q000235:genetics / Q000473:pathology*; D053764:Presenilin-1 / Q000235:genetics
chemical_list: D016229:Amyloid beta-Peptides; D016564:Amyloid beta-Protein Precursor; D015415:Biomarkers; D053764:Presenilin-1