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Tracheobronchial Sensory Nerve

Molecular classification: Peripheral afferent neuron, C-fiber afferent, Aδ fiber, Stretch receptor, Ion channels (TRPV1, TRPA1, TRPV4, ASICs), G protein-coupled receptors (Bradykinin B2, Neurokinin NK-1/NK-2)

Overview

Tracheobronchial sensory nerves are a network of afferent nerve fibers innervating the trachea and bronchi. They detect mechanical and chemical stimuli, playing a crucial role in maintaining lung health, regulating airway physiology, and mediating protective reflexes such as cough and bronchoconstriction. Subtypes include C-fibers, mechanically sensitive Aδ fibers, and stretch receptors, each expressing distinct receptors and ion channels like TRPV1, TRPA1, TRPV4, ASICs, Bradykinin B2, and Neurokinin NK-1/NK-2. Alterations in these pathways contribute to asthma, chronic cough, and COPD.

Mechanism of action

Modulation of neuronal excitability and neurotransmitter release via various receptors and ion channels.

Biological functions

Sensory transductionDetection of chemical irritantsDetection of mechanical stimuliRegulation of cough reflexRegulation of bronchoconstrictionModulation of immune responses in airways

Disease associations

AsthmaChronic coughCOPDInflammationAllergy

Safety considerations

Off-target effects on other sensory neuronsDevelopment of tolerance to therapeutic interventionsPotential for paradoxical effects (e.g., cough induced by certain drugs)Complications arising from impaired cough reflex.

Interacting drugs

Capsaicin

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