Your lungs might have a secret sense of taste
In short: While we usually associate taste with the tongue, your lungs contain the same receptors used to detect bitter and sweet substances. These "extra-oral" receptors don't help you taste your breath; instead, they act as a sophisticated chemical defense system that could revolutionize how we treat asthma.
Taste receptors were originally identified on the tongue for gustation, but they are now known to be widespread chemosensors. These G protein-coupled receptors (GPCRs) are expressed in diverse organs, including the brain, gastrointestinal tract, reproductive systems, and the airways. Unlike the receptors on your tongue, these extra-oral versions are not linked to neuronal pathways that create the conscious sensation of taste. Instead, they function as local chemoreceptors, sensing the chemical environment of specific tissues.
In the lungs and upper respiratory tract, these receptors—specifically those for bitter (T2R) and sweet (T1R) tastes—play a critical role in innate immunity. They can trigger the production of nitric oxide and the secretion of antimicrobial peptides. This suggests that the body uses these receptors to detect and respond to secreted bacterial compounds. Because genetic variations in these receptors can influence how patients respond to respiratory infections, they are being studied as potential targets for treating chronic rhinosinusitis (CRS), a condition that currently drives a significant portion of adult antibiotic prescriptions.
A surprising discovery involving these receptors occurred when researchers studied the smooth muscle of the lungs, which regulates airway contraction. They found that activating bitter taste receptors actually caused the airways to relax significantly. While scientists initially expected the muscles to tense up in response to toxic bitter compounds, the receptors instead promoted bronchodilation. This unexpected mechanism, which involves localized calcium signaling, offers a promising new lead for developing treatments for asthma, emphysema, and chronic bronchitis that might outperform existing medications.
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Sources
- Summary by Intellect · source: The Really Important Reason Your Lungs Have Taste Receptors
- Also: Taste receptors in the upper airway
- Also: Receptors for Taste Found in the Lungs
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