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In the Brain, It Is Not All about Sugar.
Bernardo C Antunes1, Tomás Mateus1, Vanessa A Morais1
1Instituto de Medicina Molecular-João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisbon, Portugal; bernardo.antunes@medicina.ulisboa.pt (B.C.A.); tomasmateus@medicina.ulisboa.pt (T.M.).
Neurosci
|November 1, 2024
Summary
The brain primarily uses glucose, but this review explores fatty acid (FA) metabolism as an alternative energy source. FA
Area of Science:
- Neuroscience
- Metabolic Biochemistry
- Cellular Energetics
Background:
- The brain's energy supply relies on a balance between glycolysis and oxidative phosphorylation.
- Glucose is considered the primary neuronal fuel, but alternative substrates like lactate and ketone bodies are recognized.
- The role of fatty acid (FA) metabolism in brain energy homeostasis remains debated.
Purpose of the Study:
- To review the evidence for and against the utilization of fatty acids as an energy source in the brain.
- To investigate the potential role of FA metabolism in synaptic energy supply.
Main Methods:
- Literature review and synthesis of existing research on brain energy metabolism.
- Analysis of arguments concerning FA metabolism in neuronal bioenergetics.
- Discussion of mitochondrial features at the synapse.
Main Results:
- Evidence for and against fatty acid utilization in the brain is presented.
- The contribution of FA metabolism to overall brain energy is considered significant but debated.
- Synaptic mitochondria may possess unique features for effective FA utilization.
Conclusions:
- Fatty acid metabolism's role in brain energy homeostasis is complex and not fully understood.
- Fatty acids may play a more critical role at the synapse level.
- Further research is needed to elucidate FA utilization in neuronal bioenergetics.
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