Research Models
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3 Models
2 Visualizations
AD-related Research Models
Phenotypes Examined
- Plaques
- Tangles
- Neuronal Loss
- Gliosis
- Synaptic Loss
- Changes in LTP/LTD
- Cognitive Impairment
When visualized, these phenotypes will distributed over a 18 month timeline demarcated at the following intervals: 3mo, 6mo, 9mo, 1yr, 15mo, 18mo+.
Arc48 (APPSw/Ind/Arc)
Observed
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Plaques at 9
Parenchymal neuritic plaques by 2 months with prominent plaque deposition in the hippocampus by 3-4 months. Abundant mature thioflavin-S positive plaques with dystrophic neurites by 10-12 months (Cheng et al., 2007).
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Gliosis at 13
Reactive astrocytosis at 3-4 months in the dentate gyrus as demonstrated by GFAP immunoreactivity (Cheng et al., 2007).
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Cognitive Impairment at 13
At 3-4 months the Arc48 mouse was able to learn a task involving escape to a cued platform in the Morris water maze, but were impaired in the ability to use extramaze cues to navigate to the hidden platform (Cheng et al., 2007).
Absent
-
Tangles at
Absent.
No Data
-
Neuronal Loss at
Unknown.
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Synaptic Loss at
Unknown.
-
Changes in LTP/LTD at
Unknown.
Genes | Mutations | Modification | Disease | Neuropathology | Behavior/Cognition |
---|---|---|---|---|---|
APP | APP K670_M671delinsNL (Swedish), APP V717F (Indiana), APP E693G (Arctic) | APP: Transgenic | Alzheimer's Disease, Cerebral Amyloid Angiopathy | Parenchymal neuritic plaques by 2 months accompanied by dystrophic neurites. Prominent hippocampal Aβ deposition by 3-4 months. Relatively low Aβ42/Aβ40 ratio. Comparable cerebrovascular amyloid deposition to J20. |
At 3-4 months the Arc48 mouse was able to learn a task involving escape to a cued platform in the Morris water maze, but had an impaired ability to use extramaze cues to navigate to the hidden platform. |
PDAPP(line109)
Observed
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Plaques at 26
In heterozygous mice no plaque pathology at 4-6 months. At 6-9 months mice begin to exhibit deposits of human Aβ in the hippocampus, corpus callosum, and cerebral cortex. Plaques become more extensive with age and vary in size and structure including diffuse irregular plaques and compact cored plaques (Games et al., 1995).
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Gliosis at 26
GFAP-positive astrocytes and activated microglia associated with plaques (Games et al., 1995).
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Synaptic Loss at 35
Decreased synaptic density in the dentate gyrus as measured by synaptophysin immunoreactivity. Also decreased dendritic density as measured by MAP2 immunoreactivity (Games et al., 1995).
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Changes in LTP/LTD at 17
Alterations in LTP induced by theta burst stimulation at 4-5 months which is prior to plaque formation; although the potentiation immediately after TBS was comparable to control mice, the potentiation decayed more rapidly in PDAPP mice. Also paired pulse facilitation was enhanced. Responses to high frequency stimulation bursts were distorted (Larson et al., 1999).
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Cognitive Impairment at 13
Deficits in a variety of memory paradigms from a young age. Robust deficits in the radial arm maze at 3 months (deficits appear before amyloid plaque deposits). Object recognition, 6, 9-10 months. Operant learning, 3, 6 months (Dodart et al., 1999).
Absent
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Tangles at
No paired helical filaments or aggregates, but phosphorylated tau immunoreactivity is observed in dystrophic neurites after 14 months (Masliah et al., 2001).
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Neuronal Loss at
Absent.
No Data
Genes | Mutations | Modification | Disease | Neuropathology | Behavior/Cognition |
---|---|---|---|---|---|
APP | APP V717F (Indiana) | APP: Transgenic | Alzheimer's Disease | Amyloid plaques in the hippocampus, cerebral cortex. Gliosis. Dystrophic neurites. Decreased synaptic and dendritic density in the hippocampus. |
Deficits in a variety of memory paradigms from a young age. Deficits in the radial arm maze at 3 months (before plaques), object recognition, operant learning, spatial reference memory (starting at 3-4 months), cued fear conditioning at 11 months. |