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Updated: Jul 31, 2026
Viral Tracing of Genetically Defined Neural Circuitry
Published on: October 17, 2012
RVLM-IML pathway may implicate controlling peripheral airways by melanocortinergic-sympathetic signaling: a
Cheng-Jin Yue1, Li Feng2, Qi Huang3
1Department of Anesthesiology, Maternal and Child Health Hospital of Hubei Province Wuhan 430070, Hubei, People's Republic of China.
Abstract:
Pseudorabies virus (PRV)-614 was injected into the tracheal wall of male MC4R-GFP transgenic mice, resulting in retrograde infections in spinal cord and autonomic premotor areas of the brain including the rostroventrolateral medulla (RVLM). This polysynaptic pathway to the airway may form the substrate underlying the impact of IML and RVLM on airway function. The neurochemical phenotype of MC4R-GFP-positive neurons was identified using fluorescence immunocytochemical labeling. PRV-614/MC4R-GFP dual labeled neurons were detected in spinal IML and the rostral ventrolateral medulla (RVLM). These data demonstrate the RVLM-IML pathway of synaptically connected neurons extending to the airway through melanocortinergic-sympathetic signaling.
Insights
This study reveals a neural pathway from the brainstem to the airway. Melanocortinergic neurons in the brainstem connect to the spinal cord, influencing airway function.
Area of Science:
- Neuroscience
- Autonomic Nervous System Research
- Respiratory Physiology
Background:
- The neural control of airway function is complex and involves pathways from the brainstem to the periphery.
- Melanocortinergic systems play a role in autonomic regulation, but their specific involvement in airway control is not fully understood.
Purpose of the Study:
- To investigate the neural pathways connecting the brainstem and spinal cord to the airway.
- To identify the neurochemical phenotype of neurons involved in this pathway.
- To elucidate the role of melanocortinergic signaling in airway autonomic control.
Main Methods:
- Injection of Pseudorabies virus (PRV)-614 into the tracheal wall of male MC4R-GFP transgenic mice.
- Retrograde tracing to identify infected neurons in the spinal cord and brainstem.
- Fluorescence immunocytochemical labeling to determine the neurochemical phenotype of infected neurons.
Main Results:
- Retrograde infection was observed in the spinal cord's intermediolateral nucleus (IML) and the brainstem's rostroventrolateral medulla (RVLM).
- PRV-614/MC4R-GFP dual-labeled neurons were identified in both the IML and RVLM.
- These findings demonstrate a polysynaptic pathway from the RVLM to the airway via the IML.
Conclusions:
- A neural pathway involving melanocortinergic neurons connects the RVLM and IML to the airway.
- This pathway likely mediates the influence of the RVLM and IML on airway function.
- Melanocortinergic-sympathetic signaling is implicated in the autonomic control of the airway.
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