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A gut-brain neural circuit for nutrient sensory transduction
Melanie Maya Kaelberer1, Kelly L Buchanan2, Marguerita E Klein1
1Department of Medicine, Duke University, Durham, NC, USA.
Science (New York, N.Y.)
|September 22, 2018
Summary
Scientists discovered a direct gut-to-brain connection. Enteroendocrine cells, now called neuropod cells, form synapses with vagal neurons, enabling rapid signal transmission from the gut to the brain.
Area of Science:
- Neuroscience
- Gastroenterology
- Cell Biology
Background:
- The brain's perception of gut stimuli was believed to be solely mediated by passive hormone release.
- A direct neural connection between the vagus nerve and gut epithelial sensor cells (enteroendocrine cells) was previously undescribed.
Purpose of the Study:
- To investigate the potential for direct neural communication between enteroendocrine cells and the vagus nerve.
- To identify the mechanism by which gut luminal signals are transduced and transmitted to the brain.
Main Methods:
- Utilized a mouse model to study enteroendocrine cell and vagal neuron interactions.
- Electrophysiological and imaging techniques were employed to observe signal transduction.
Main Results:
- Enteroendocrine cells form direct synapses with vagal neurons.
- These cells, termed neuropod cells, utilize glutamate as a neurotransmitter to transduce gut luminal signals.
- Signal transmission occurs within milliseconds, establishing a direct neuroepithelial circuit.
Conclusions:
- Enteroendocrine cells (neuropod cells) act as direct sensors, forming a novel neuroepithelial circuit connecting the intestinal lumen to the brainstem.
- This discovery reveals a synaptic pathway for the brain to sense gut stimuli with high temporal and topographical precision.
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