期刊
JOURNAL OF ALZHEIMERS DISEASE
卷 82, 期 3, 页码 1183-1202出版社
IOS PRESS
DOI: 10.3233/JAD-201567
关键词
Alzheimer's disease; amyloid-beta peptide; behavior; hippocampal plasticity; memory
资金
- Fundacao para a Ciencia e a Tecnologia (FCT)/Ministerio da Ciencia, Tecnologia e Ensino Superior (MCTES) atraves de Fundos do Orcamento de Estado [IF/01227/2015, UID/BIM/50005/2019]
- FCT [SFRH/BD/1297 10/2017, IMM/CT/35-2018, IMM/BI/19-2019, PD/BD/114441/2016]
- H2020-WIDESPREAD-05-2017-Twinning (EpiEpinet) [952455]
- Fundação para a Ciência e a Tecnologia [PD/BD/114441/2016] Funding Source: FCT
The study focused on a rat model of Alzheimer's disease obtained by intracerebroventricular injection of soluble amyloid-C-42 (A beta(42)), and found that immature neuronal dendritic morphology was abnormally enhanced one month after injection. Surprisingly, there were no changes in cognitive performance or locomotor and anxious-related activity in the animal behavior tests.
Background: The use of Alzheimer's disease (AD) models obtained by intracerebral infusion of amyloid-beta (A beta) has been increasingly reported in recent years. Nonetheless, these models may present important challenges. Objective: We have focused on canonical mechanisms of hippocampal-related neural plasticity to characterize a rat model obtained by an intracerebroventricular (icv) injection of soluble amyloid-C-42 (A beta(42)). Methods: Animal behavior was evaluated in the elevated plus maze, Y-Maze spontaneous or forced alternation, Morris water maze, and open field, starting 2 weeks post-A beta(42) infusion. Hippocampal neurogenesis was assessed 3 weeks after A beta(42) injection. A beta deposition, tropomyosin receptor kinase B levels, and neuroinflammation were appraised at 3 and 14 days post-A beta(42) administration. Results: We found that immature neuronal dendritic morphology was abnormally enhanced, but proliferation and neuronal differentiation in the dentate gyrus was conserved one month after A beta(42) injection. Surprisingly, animal behavior did not reveal changes in cognitive performance nor in locomotor and anxious-related activity. Brain-derived neurotrophic factor related-signaling was also unchanged at 3 and 14 days post-A beta icv injection. Likewise, astrocytic and microglial markers of neuroinflammation in the hippocampus were unaltered in these time points. Conclusion: Taken together, our data emphasize a high variability and lack of behavioral reproducibility associated with these A beta injection-based models, as well as the need for its further optimization, aiming at addressing the gap between preclinical AD models and the human disorder.
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