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Synapses: The Brain's Energy-Demanding Sites
Andreia Faria-Pereira1, Vanessa A Morais1
1Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal.
International Journal of Molecular Sciences
|April 12, 2022
Summary
The brain relies on glucose metabolism, specifically glycolysis and mitochondrial oxidative phosphorylation, to power synaptic transmission. Disruptions in these energy pathways are linked to neurodegenerative diseases.
Area of Science:
- Neuroscience
- Cellular Biology
- Bioenergetics
Background:
- The brain is highly energy-demanding, with synaptic transmission being a major consumer.
- Glucose metabolism via glycolysis and mitochondrial oxidative phosphorylation fuels neuronal activity.
- Understanding energy production at presynaptic terminals is crucial for neuronal function.
Purpose of the Study:
- To review the balance between glycolysis and oxidative phosphorylation for synaptic energy demands.
- To explore the role of mitochondria in synaptic calcium buffering and reactive oxygen species regulation.
- To highlight the distinct functional characteristics of synaptic mitochondria.
Main Methods:
- Literature review of recent studies on synaptic bioenergetics.
- Analysis of the interplay between glycolysis and oxidative phosphorylation under resting and stimulated conditions.
- Examination of mitochondrial functions beyond ATP production at the synapse.
Main Results:
- Synaptic mitochondria have unique functional properties compared to other brain mitochondria.
- Impaired mitochondrial pathways negatively affect neuronal homeostasis and synaptic activity.
- The balance of energy production pathways is critical for maintaining synaptic function.
Conclusions:
- Dysregulation of synaptic bioenergetics is an early hallmark of neurodegenerative disorders.
- Mitochondrial and glycolytic dysfunctions contribute to synaptic energy deficits and degeneration.
- Targeting synaptic energy metabolism may offer therapeutic strategies for neurodegenerative diseases.
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