title: A potassium channel in cultured chondrocytes.
abstract: Chondrocytes, obtained from preosseous cartilage, were studied by patch clamp technique in cell-attached recording configuration, and single potassium channels were characterized at different stages of culture. After 3 days, outward currents were present, with an open probability increasing with depolarization, and the K+ channels showing a mean slope conductance of 82 pS in asymmetric and 168 pS in symmetric potassium solution. Tetraethylammonium (TEA) and quinidine blocked the channels. Cells at confluence showed similar channel activity, with conductances of 121 and 252 pS, respectively. We suggest that culture time and/or conditions may modify K+ channels or induce the expression of a new type of channels.
authors: Istituto di Fisiologia, Biofisica e Chimica delle Macromolecole, Università di Trieste, Italy.
authors: M
authors: M
authors: Grandolfo
authors: M
authors: M
authors: Martina
authors: F
authors: F
authors: Ruzzier
authors: F
authors: F
authors: Vittur
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002356:Cartilage / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D002478:Cells, Cultured; D004553:Electric Conductivity; D008564:Membrane Potentials / Q000187:drug effects; D015221:Potassium Channels / Q000187:drug effects / Q000378:metabolism*; D019789:Tetraethylammonium; D013757:Tetraethylammonium Compounds / Q000494:pharmacology
chemical_list: D015221:Potassium Channels; D013757:Tetraethylammonium Compounds; D019789:Tetraethylammonium