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Published in: European Journal of Nuclear Medicine and Molecular Imaging 7/2015

Open Access 01-06-2015 | Original Article

Astrocytosis precedes amyloid plaque deposition in Alzheimer APPswe transgenic mouse brain: a correlative positron emission tomography and in vitro imaging study

Authors: Elena Rodriguez-Vieitez, Ruiqing Ni, Balázs Gulyás, Miklós Tóth, Jenny Häggkvist, Christer Halldin, Larysa Voytenko, Amelia Marutle, Agneta Nordberg

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 7/2015

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Abstract

Purpose

Pathological studies suggest that neuroinflammation is exacerbated by increased beta-amyloid (Aβ) levels in the brain early in Alzheimer’s disease (AD). The time course and relationships between astrocytosis and Aβ deposition were examined using multitracer in vivo positron emission tomography (PET) imaging in an AD transgenic mouse model, followed by postmortem autoradiography and immunohistochemistry analysis.

Methods

PET imaging with the amyloid plaque tracer 11C-AZD2184 and the astroglial tracer 11C-deuterium-L-deprenyl (11C-DED) was carried out in APPswe mice aged 6, 8–15 and 18–24 months (4–6 animals/group) and in wild-type (wt) mice aged 8–15 and 18–24 months (3–6 animals/group). Tracer uptake was quantified by region of interest analysis using PMOD software and a 3-D digital mouse brain atlas. Postmortem brain tissues from the same APPswe and wt mice in all age groups were analysed for Aβ deposition and astrocytosis by in vitro autoradiography using 3H-AZD2184, 3H-Pittsburgh compound B (PIB) and 3H-L-deprenyl and immunostaining performed with antibodies for Aβ42 and glial fibrillary acidic protein (GFAP) in sagittal brain sections.

Results

11C-AZD2184 PET retention in the cerebral cortices of APPswe mice was significantly higher at 18–24 months than in age-matched wt mice. Cortical and hippocampal 11C-DED PET binding was significantly higher at 6 months than at 8–15 months or 18–24 months in APPswe mice, and it was also higher than at 8–15 months in wt mice. In vitro autoradiography 3H-AZD2184 and 3H-PIB binding confirmed the in vivo findings with 11C-AZD2184 and demonstrated age-dependent increases in Aβ deposition in APPswe cortex and hippocampus. There were no significant differences between APPswe and wt mice in 3H-L-deprenyl autoradiography binding across age groups. Immunohistochemical quantification demonstrated more Aβ42 deposits in the cortex and hippocampus and more GFAP+ reactive astrocytes in the hippocampus at 18–24 months than at 6 months in APPswe mice.

Conclusion

The findings provide further in vivo evidence that astrocytosis occurs early in AD, preceding Aβ plaque deposition.
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Metadata
Title
Astrocytosis precedes amyloid plaque deposition in Alzheimer APPswe transgenic mouse brain: a correlative positron emission tomography and in vitro imaging study
Authors
Elena Rodriguez-Vieitez
Ruiqing Ni
Balázs Gulyás
Miklós Tóth
Jenny Häggkvist
Christer Halldin
Larysa Voytenko
Amelia Marutle
Agneta Nordberg
Publication date
01-06-2015
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 7/2015
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-015-3047-0

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