Nasal chemoreceptor (null)

Nasal chemoreceptors, often referred to as solitary chemosensory cells (SCCs) or chemosensory cells of the nasal epithelium, are dispersed throughout the nasal cavity. These cells express molecular features, most notably the T2R (bitter taste) G protein-coupled receptors and gustducin, a G protein also found in taste receptor cells[2][4][5]. They can sense airborne chemical irritants, including bitter substances and potential toxins, and initiate rapid protective reflexes such as apnea, coughing, or sneezing by activating trigeminal nerve fibers[2][5]. Although they use some of the same receptors found in taste buds, these are molecular sensors for non-olfactory irritants rather than odor detection, distinguishing them from classic olfactory sensory neurons[2][4][5]. Nasal chemoreceptors do not represent a single receptor protein but rather a functionally similar population of receptor-expressing sensory cells. They serve as airway sentinels, protecting from inhaled irritants, and may contribute to the body's broader chemosensory system[2][5]. Note: The entry "nasal chemoreceptors" does not refer to a single defined molecular target, enzyme, or receptor protein, but rather to a group of specialized sensory cells expressing multiple chemosensory GPCRs (mainly T2R taste receptors) in the nasal epithelium. For structured target databases, it is better to index the individual receptor types (e.g., "Taste receptor type 2 member X") rather than "nasal chemoreceptor" as a molecular entity[2][4][5].

Other names

Solitary chemosensory cellNasal solitary chemosensory cellNasal chemosensory cellNasal T2R-expressing cell

Not applicable for a drug, but mechanism involves GPCR activation, G protein signaling, and synaptic contact with trigeminal nerves