Tetraethylammonium-insensitive, Ca(2+)-activated whole-cell K+ currents in rat submandibular acinar cells.
Using whole-cell patch-clamp techniques, we demonstrate, for the first time, that rat submandibular acinar cells contain a tetraethylammonium (TEA)-insensitive, Ca(2+)-activated K+ conductance which is not attributable to large conductance, voltage-sensitive, Ca(2+)-dependent K+ channels (maxi-K+ channels). Taken together with our recent K+ efflux and fluid secretion studies in intact rat submandibular gland, we postulate that the K+ conductance reported here may be involved in the basolateral K+ efflux pathway activated by cytosolic Ca2+ concentration during secretion by this gland.
Ishikawa
T
T
Department of Molecular Physiology, National Institute for Physiological Sciences, Okazaki, Japan.
Murakami
M
M
D000818:Animals; D002118:Calcium / Q000378:metabolism*; D004594:Electrophysiology; D066298:In Vitro Techniques; D018408:Patch-Clamp Techniques; D015221:Potassium Channels / Q000187:drug effects / Q000378:metabolism*; D011803:Quinine / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D012472:Salivation / Q000187:drug effects; D013363:Submandibular Gland / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D013757:Tetraethylammonium Compounds / Q000494:pharmacology*
D015221:Potassium Channels; D013757:Tetraethylammonium Compounds; D011803:Quinine; D002118:Calcium