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In-Vivo Calcium Imaging of Sensory Neurons in the Rat Trigeminal Ganglion
Published on: February 9, 2024
GABA neurons in the ventral tegmental area responding to peripheral sensory input
Chang-Liang Liu1, Ming Gao, Guo-Zhang Jin
1Department of Pharmacology, State Key Laboratory of Drug Research, Institute of Materia Medica, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.
Plos One
|December 20, 2012
Summary
Ventral tegmental area (VTA) GABA and dopamine (DA) neurons respond to ventilation. This study reveals sensory input from breathing modulates VTA neuron activity, suggesting a role in processing sensory information.
Area of Science:
- Neuroscience
- Cellular Neuroscience
Background:
- Dopamine (DA) neurons in the ventral tegmental area (VTA) are involved in reward and aversive stimuli processing.
- GABA neurons regulate DA neuron firing, but their response to aversive sensory input is understudied.
Purpose of the Study:
- To investigate the response of VTA GABA neurons to sensory input from ventilation.
- To explore the modulation of VTA GABA and DA neurons by ventilation-associated sensory stimuli.
Main Methods:
- Extracellular single-unit recording and spectral analysis in paralyzed, ventilated rats.
- Investigation of N-methyl-D-aspartase (NMDA) receptor antagonist MK-801 effects on VTA neuron firing patterns.
- Transection of sensory pathways and anesthesia to assess the origin of ventilation sensitivity.
Main Results:
- 44% of VTA GABA cells exhibited ventilation-sensitive firing patterns with significant oscillations.
- Most ventilation-sensitive GABA neurons (38/47) were excited, while most DA neurons (11/14) were inhibited.
- Ventilation-associated oscillations disappeared under anesthesia or sensory pathway transection; MK-801 disrupted and locally enhanced GABA neuron sensitivity.
Conclusions:
- VTA GABA and DA neurons are modulated by sensory input from ventilation.
- This modulation suggests a potential functional role for the VTA in processing sensation-related input.
- NMDA receptor activity is crucial for the ventilation-associated firing patterns in VTA GABA neurons.
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