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Astrocytic metabolic and inflammatory changes as a function of age
Tianyi Jiang1, Enrique Cadenas
1Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA.
Aging Cell
|September 20, 2014
Summary
Aging astrocytes exhibit increased mitochondrial metabolism and inflammatory responses, potentially shifting their function from supportive to harmful, impacting brain health.
Area of Science:
- Neuroscience
- Cellular Metabolism
- Aging Research
Background:
- Astrocytes play crucial roles in brain function and are implicated in age-related neurological changes.
- The interplay between astrocyte metabolism and inflammation during aging is not fully understood.
Purpose of the Study:
- To investigate the age-dependent changes in the metabolic-inflammatory axis within primary rat astrocytes.
- To explore the relationship between mitochondrial function, oxidative stress, and inflammatory signaling in aging astrocytes.
Main Methods:
- Primary astrocytes were isolated from Sprague-Dawley rats of different ages (7, 13, and 18 months).
- Mitochondrial oxidative metabolism was assessed using glucose and pyruvate as substrates.
- Mitochondrial biogenesis was evaluated by measuring COX3/18SrDNA.
- Hydrogen peroxide generation, NOX2 expression, NFκB signaling, and nitric oxide synthase 2 (inducible nitric oxide synthase) expression were analyzed.
- Astrocytes were treated with inflammatory cytokines (IL-1β, TNFα) to assess their responses.
Main Results:
- Astrocytes showed an age-dependent increase in mitochondrial oxidative metabolism and mitochondrial biogenesis.
- Hydrogen peroxide generation and NFκB signaling increased with age, linked to NOX2 expression.
- Aging astrocytes exhibited augmented responses to IL-1β and TNFα.
- NFκB activation led to increased inducible nitric oxide synthase expression and nitric oxide production.
- Cytokine treatment further stimulated mitochondrial metabolism and biogenesis in astrocytes.
Conclusions:
- Increased mitochondrial aerobic metabolism and inflammatory responses are interconnected in aging astrocytes.
- These interconnected changes may facilitate a functional switch in astrocytes from neurotrophic to neurotoxic roles with age.
- The findings highlight a critical age-dependent metabolic-inflammatory axis in astrocytes with potential implications for brain aging and neurodegeneration.
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