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The fluid that covers the surface of conducting airways (airway surface fluid, ASF) is a critical component of one of the first defense mechanisms of the lung against microbial and other environmental insults. Despite its physiologic importance, ASF is one of the only fluids in the human body whose composition remains poorly defined and understood. Attempts(More)
The reabsorptive duct of the eccrine sweat gland has a large transepithelial conductance consisting mainly of a high conductance to Cl− and a smaller, amiloride-blockable Na+ conductance (Bijman and Frömter 1986; Quinton 1985). Cells have been cultured from sweat ducts and their properties previously studied in Ussing chambers (Pedersen 1988) and with(More)
We demonstrate that electrogenic glucose coupled Na+ absorption accounts for about 20% of the residual, amiloride and Cl− insensitive, Na+ transport in isolated (equine) trachea. Either glucose removal from the mucosal side or addition of 10 −4 M phloridzin, a known pharmacological inhibitor of Na-glucose cotransport in small intestine and kidney proximal(More)
Basic components of unstimulated electrolyte transport across equine tracheal mucosa were characterized. After the tissue was mounted in Ussing chambers, both current and tissue resistance gradually increased for approximately 60 min before reaching stable values. Thereafter, under open-circuit conditions, the tissue had a resistance of 250 +/- 14(More)
We describe techniques which we developed to study the composition and regulation of airway surface fluid (ASF). ASF from isolated equine tracheal mucosa was absorbed onto or equilibrated with small strips of ashless filter paper after timed incubations in a water-saturated, 37 degrees C environment. After expression of the fluid from the paper,(More)
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