Potassium channels on nasopharyngeal pressure-sensing nerves

Potassium channels on nasopharyngeal pressure-sensing nerves refers to a functional group of ion channels, including large-conductance calcium-activated (BK) and tandem pore domain (TASK) channels, located on the afferent nerve endings in the upper airway (McLeod et al., 2014, PMID: 24121148). These channels regulate the excitability of mechanoreceptors that detect negative pressure during inspiration, a process vital for the "negative pressure reflex" that maintains airway patency (Horner, 2008, PMID: 18761181). In conditions such as obstructive sleep apnea (OSA) or opioid-induced respiratory depression, the activity of these nerves is often insufficient to prevent airway collapse or maintain adequate ventilation. Pharmacological inhibition of these potassium channels prevents K+ efflux, causing depolarization and increased firing of the sensory nerves, which in turn stimulates upper airway dilator muscles like the genioglossus (Golder et al., 2013, PMID: 23515208). Investigational drugs such as GAL-021 and GAL-102 have targeted these channels to treat respiratory disorders by enhancing natural airway-protective reflexes without the central nervous system depression associated with other treatments.

Other names

Pan-voltage-gated and ligand-gated potassium channels on nasopharyngeal pressure-sensing nervesUpper airway mechanoreceptor potassium channelsBK channelsTASK channelsK+ channelsNasopharyngeal pressure-sensing nerve potassium channels

Inhibition of potassium channels (e.g., BK or TASK) on sensory nerve endings leads to depolarization and increased firing of nasopharyngeal pressure-sensing nerves, which enhances the negative pressure reflex and stimulates upper airway dilator muscles to maintain patency.