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Updated: Dec 5, 2025
Intracerebroventricular Injection of Amyloid-β Peptides in Normal Mice to Acutely Induce Alzheimer-like Cognitive Deficits
Published on: March 16, 2016
Aβ oligomer induced cognitive impairment and evaluation of ACU193-MNS-based MRI in rabbit
Nicholas B Rozema1, Daniele Procissi2, Nicola Bertolino2
1Department of Neurobiology Northwestern University Evanston Illinois USA.
Introduction:
Amyloid-beta oligomers (AβOs) accumulate in Alzheimer's disease and may instigate neuronal pathology and cognitive impairment. We examined the ability of a new probe for molecular magnetic resonance imaging (MRI) to detect AβOs in vivo, and we tested the behavioral impact of AβOs injected in rabbits, a species with an amino acid sequence that is nearly identical to the human sequence.
Methods:
Intracerebroventricular (ICV) injection with stabilized AβOs was performed. Rabbits were probed for AβO accumulation using ACUMNS (an AβO-selective antibody [ACU193] coupled to magnetic nanostructures). Immunohistochemistry was used to verify AβO presence. Cognitive impairment was evaluated using object location and object recognition memory tests and trace eyeblink conditioning.
Results:
AβOs in the entorhinal cortex of ICV-injected animals were detected by MRI and confirmed by immunohistochemistry. Injections of AβOs also impaired hippocampal-dependent, but not hippocampal-independent, tasks and the area fraction of bound ACUMNs correlated with the behavioral impairment.
Discussion:
Accumulation of AβOs can be visualized in vivo by MRI of ACUMNS and the cognitive impairment induced by the AβOs can be followed longitudinally with the novel location memory test.
Insights
A new molecular MRI probe detects amyloid-beta oligomers (AβOs) in vivo, correlating with cognitive impairment in rabbits. This advance aids Alzheimer's disease research by visualizing AβO accumulation and its behavioral effects.
Area of Science:
- Neuroscience
- Molecular Imaging
- Alzheimer's Disease Research
Background:
- Amyloid-beta oligomers (AβOs) are implicated in Alzheimer's disease (AD) pathology and cognitive decline.
- Developing in vivo methods to detect AβOs is crucial for understanding AD progression.
Purpose of the Study:
- To evaluate a novel molecular magnetic resonance imaging (MRI) probe for detecting AβOs in vivo.
- To assess the behavioral impact of AβOs in a rabbit model with human-like Aβ sequences.
Main Methods:
- Intracerebroventricular (ICV) injection of stabilized AβOs in rabbits.
- Detection of AβO accumulation using ACUMNS (AβO-specific antibody coupled to magnetic nanostructures) via MRI.
- Assessment of cognitive function using memory tests and trace eyeblink conditioning.
Main Results:
- MRI successfully detected AβOs in the entorhinal cortex, confirmed by immunohistochemistry.
- AβO injections impaired hippocampal-dependent memory tasks.
- The extent of ACUMNS binding correlated with observed behavioral deficits.
Conclusions:
- In vivo MRI of ACUMNS can visualize AβO accumulation.
- The novel location memory test can longitudinally track cognitive impairment induced by AβOs.
