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Quantitative 3D In Silico Modeling q3DISM of Cerebral Amyloid-beta Phagocytosis in Rodent Models of Alzheimer's Disease
Published on: December 26, 2016
Alzheimer's disease-induced phagocytic microglia express a specific profile of coding and non-coding RNAs
Flavia Scoyni1, Luca Giudice1, Mari-Anna Väänänen1
1A.I.Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland.
Introduction:
Alzheimer's disease (AD) is a neurodegenerative disease and the main cause of dementia in the elderly. AD pathology is characterized by accumulation of microglia around the beta-amyloid (Aβ) plaques which assumes disease-specific transcriptional signatures, as for the disease-associated microglia (DAM). However, the regulators of microglial phagocytosis are still unknown.
Methods:
We isolated Aβ-laden microglia from the brain of 5xFAD mice for RNA sequencing to characterize the transcriptional signature in phagocytic microglia and to identify the key non-coding RNAs capable of regulating microglial phagocytosis. Through spatial sequencing, we show the transcriptional changes of microglia in the AD mouse brain in relation to Aβ proximity.
Results:
Finally, we show that phagocytic messenger RNAs are regulated by miR-7a-5p, miR-29a-3p and miR-146a-5p microRNAs and segregate the DAM population into phagocytic and non-phagocytic states.
Discussion:
Our study pinpoints key regulators of microglial Aβ clearing capacity suggesting new targets for future therapeutic approaches.
Insights
Researchers identified key microRNAs regulating microglial phagocytosis in Alzheimer's disease (AD). These microRNAs, including miR-7a-5p, miR-29a-3p, and miR-146a-5p, control the ability of disease-associated microglia (DAM) to clear beta-amyloid plaques.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Alzheimer's disease (AD) is a leading cause of dementia, characterized by beta-amyloid (Aβ) plaques and associated microglia.
- Disease-associated microglia (DAM) exhibit unique transcriptional profiles, but regulators of their phagocytic function remain unidentified.
Purpose of the Study:
- To characterize the transcriptional signature of phagocytic microglia in the AD brain.
- To identify non-coding RNAs regulating microglial phagocytosis of Aβ.
Main Methods:
- RNA sequencing of Aβ-laden microglia isolated from 5xFAD mouse brains.
- Spatial sequencing to analyze microglial transcriptional changes relative to Aβ plaque proximity.
Main Results:
- Identified specific microRNAs (miR-7a-5p, miR-29a-3p, miR-146a-5p) regulating phagocytic messenger RNAs.
- Demonstrated that these microRNAs segregate DAM into phagocytic and non-phagocytic subpopulations.
Conclusions:
- Pinpointed key regulators of microglial Aβ clearance capacity in Alzheimer's disease.
- Suggests novel therapeutic targets for enhancing microglial phagocytosis in AD.
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