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Astrocytes in physiological aging and Alzheimer's disease
J J Rodríguez-Arellano1, V Parpura2, R Zorec3
1Achucarro Center for Neuroscience, IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain; Department of Neurosciences, University of the Basque Country UPV/EHU and CIBERNED, Leioa, Spain.
Neuroscience
|January 18, 2015
Summary
Astrocytes play vital roles in brain health, but their dysfunction contributes to brain aging and neurodegenerative diseases like Alzheimer's disease (AD). Targeting astrocyte reactivity offers potential therapeutic strategies for these conditions.
Area of Science:
- Neuroscience
- Cell Biology
- Neuropathology
Background:
- Astrocytes are crucial for central nervous system (CNS) homeostasis, defense, and regeneration.
- Loss of astroglial function and altered reactivity are implicated in brain aging and neurodegenerative diseases.
- Astrocyte changes in aging and neurodegeneration are heterogeneous and region-specific.
Purpose of the Study:
- To investigate the role of astrocytes in the aging brain and neurodegenerative diseases, particularly Alzheimer's disease (AD).
- To explore the regional specificity of astroglial responses in AD.
- To identify astrocytes as potential therapeutic targets for neurodegenerative disorders.
Main Methods:
- Review of existing literature on astrocyte function in aging and AD models.
- Analysis of regional differences in astrocyte morphology and reactivity in response to pathology.
- Consideration of factors regulating astroglial function.
Main Results:
- In early AD models, astrocytes degenerate and atrophy, potentially impairing brain homeostasis and causing cognitive deficits.
- In later AD stages, reactive astrocytes are found near neuritic plaques.
- Astrocyte reactivity in AD models is region-specific; some areas like the hippocampus show gliosis, while others like the entorhinal and prefrontal cortices do not, coinciding with higher vulnerability.
Conclusions:
- Astrocyte dysfunction is a key factor in brain aging and neurodegeneration.
- The region-specific nature of astroglial responses in AD suggests differential vulnerability.
- Modulating astrocyte function presents a promising therapeutic avenue for preventing and treating neurodegenerative diseases.
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