In health, the glucose concentration of airway surface liquid (ASL) is 0.4mM, around 12 times lower than blood glucose concentration. Airway glucose homeostasis is a set of processes that actively maintain low ASL glucose concentration against the transepithelial gradient. Tight junctions between airway epithelial cells restrict paracellular glucose movement. Epithelial cellular glucose transport and metabolism removes glucose from ASL. Low ASL glucose concentrations make an important contribution to airways defence against infection, limiting bacterial growth by restricting nutrient availability.

Read More