TRPA1 receptors in cough

Area of Science:

• Neuroscience
• Pharmacology
• Respiratory Medicine

Background:

• Transient Receptor Potential (TRP) channels, including TRPV1, are known to be involved in the cough reflex.
• TRPV1 agonists like vanilloids and protons are potent cough-inducing stimuli.
• The TRPA1 receptor, activated by irritants like acrolein, is gaining attention for its role in cough.

Purpose of the Study:

• To investigate the role of the TRPA1 receptor in the cough reflex.
• To explore TRPA1 as a potential therapeutic target for anti-tussive drug development.

Main Methods:

• Review of existing literature on TRP channels, TRPA1 function, and cough reflex mechanisms.
• Analysis of studies involving TRPA1 activation by environmental irritants and inflammatory mediators.
• Examination of data from animal models and human volunteers regarding TRPA1 ligands and cough induction.

Main Results:

• TRPA1 channels are activated by cold, irritants, and reactive molecules, primarily in nociceptive neurons.
• Activation of TRPA1 channels stimulates vagal bronchopulmonary C-fibres, leading to cough.
• TRPA1 ligands have been shown to induce cough in animal models and human subjects.

Conclusions:

• TRPA1 channels are activated by diverse exogenous and endogenous substances, including inflammatory mediators and irritants.
• TRPA1 is a significant target for developing novel anti-tussive medications.
• Targeting TRPA1 offers a promising strategy for managing cough hypersensitivity and related conditions.