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Updated: Aug 2, 2025
Quantitative 3D In Silico Modeling q3DISM of Cerebral Amyloid-beta Phagocytosis in Rodent Models of Alzheimer's Disease
Published on: December 26, 2016
The Alzheimer's disease risk factor INPP5D restricts neuroprotective microglial responses in amyloid beta-mediated
Joshua D Samuels1,2,3, Katelyn A Moore1, Hannah E Ennerfelt1,2
1Department of Neuroscience, Center for Brain Immunology and Glia (BIG), University of Virginia (UVA), Charlottesville, Virginia, USA.
Introduction:
Mutations in INPP5D, which encodes for the SH2-domain-containing inositol phosphatase SHIP-1, have recently been linked to an increased risk of developing late-onset Alzheimer's disease. While INPP5D expression is almost exclusively restricted to microglia in the brain, little is known regarding how SHIP-1 affects neurobiology or neurodegenerative disease pathogenesis.
Methods:
We generated and investigated 5xFAD Inpp5dfl/fl Cx3cr1Ert2Cre mice to ascertain the function of microglial SHIP-1 signaling in response to amyloid beta (Aβ)-mediated pathology.
Results:
SHIP-1 deletion in microglia led to substantially enhanced recruitment of microglia to Aβ plaques, altered microglial gene expression, and marked improvements in neuronal health. Further, SHIP-1 loss enhanced microglial plaque containment and Aβ engulfment when compared to microglia from Cre-negative 5xFAD Inpp5dfl/fl littermate controls.
Discussion:
These results define SHIP-1 as a pivotal regulator of microglial responses during Aβ-driven neurological disease and suggest that targeting SHIP-1 may offer a promising strategy to treat Alzheimer's disease.
Highlights:
Inpp5d deficiency in microglia increases plaque-associated microglia numbers. Loss of Inpp5d induces activation and phagocytosis transcriptional pathways. Plaque encapsulation and engulfment by microglia are enhanced with Inpp5d deletion. Genetic ablation of Inpp5d protects against plaque-induced neuronal dystrophy.
Insights
Deleting SHIP-1 in microglia boosts their response to amyloid plaques, improving neuronal health and suggesting SHIP-1 as a potential Alzheimer's disease target.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Mutations in INPP5D, encoding SHIP-1, are linked to late-onset Alzheimer's disease risk.
- SHIP-1's role in brain neurobiology and Alzheimer's pathogenesis is largely unknown.
- INPP5D is primarily expressed in brain microglia.
Purpose of the Study:
- To investigate the function of microglial SHIP-1 signaling in Alzheimer's disease.
- To determine how SHIP-1 deficiency impacts amyloid-beta pathology in the brain.
Main Methods:
- Generated and studied 5xFAD Inpp5dfl/fl Cx3cr1Ert2Cre mice.
- Assessed microglial recruitment, gene expression, and plaque interaction.
- Evaluated neuronal health in the context of amyloid pathology.
Main Results:
- SHIP-1 deletion in microglia enhanced recruitment to amyloid plaques.
- Microglial gene expression and phagocytic activity were altered by SHIP-1 loss.
- Neuronal health improved, and plaque containment/engulfment by microglia was enhanced.
Conclusions:
- SHIP-1 is a key regulator of microglial responses in Alzheimer's disease.
- Targeting SHIP-1 may represent a novel therapeutic strategy for Alzheimer's disease.
- Microglial SHIP-1 deficiency protects against amyloid-beta-induced neuronal damage.
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