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A Method to Target and Isolate Airway-innervating Sensory Neurons in Mice

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Lung afferent activity: implications for respiratory sensation.

John Widdicombe

Respiratory Physiology & Neurobiology

|October 28, 2008

Summary

Lung sensations like pain and cough urge are linked to vagal nerve sensors. Research faces challenges connecting specific sensors to human sensations due to species differences in study methods.

Area of Science:

Pulmonary sensory neurobiology
Respiratory physiology

Background:

Lung stimuli trigger sensations of pain, ache, irritation, and urge-to-cough, generally mediated by vagal nerve pathways.
These sensations persist even with high cervical spinal cord transection or neuromuscular paralysis, indicating complex neural origins.
At least nine distinct bronchopulmonary sensors exist, primarily studied in animal models.

Discussion:

A significant challenge is linking specific lung sensors to distinct human sensations, as sensation studies are largely confined to humans, while neural mechanisms are studied in other species.
The urge-to-cough likely involves multiple sensors (at least five), but their precise relationship to unpleasant sensations remains unclear.
Vagal sensors, potentially including slowly adapting pulmonary stretch receptors (SARs), may also influence the sensation of air hunger and awareness of lung volume.

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Key Insights:

Vagal nerve pathways are crucial for mediating lung-related sensations, including pain, irritation, and the urge to cough.
There is a disconnect between studying human sensation and animal neural mechanisms, hindering a complete understanding of lung sensory pathways.
Lung sensors can be sensitized or desensitized, potentially explaining variations in dyspneic sensations.

Outlook:

Future research should aim to bridge the gap between human sensory perception and animal model neurobiology to identify specific sensor-sensation links.
Investigating the role of various lung sensors in complex respiratory sensations like dyspnea requires integrated human and animal studies.
Understanding sensor sensitization/desensitization could lead to novel therapeutic targets for managing respiratory discomfort.