title: UCL 1684: a potent blocker of Ca2+ -activated K+ channels in rat adrenal chromaffin cells in culture.
abstract: The novel K+ channel blocker 6,10-diaza-3(1,3)8,(1,4)-dibenzena-1,5(1,4)-diquinolinacy  clodecaphane (UCL 1684) has been tested for its ability to inhibit Ca2+ -activated K+ currents in cultured rat chromaffin cells. Low nanomolar concentrations of UCL 1684 produced a rapid and reversible inhibition of the slow, apamin-sensitive, tail current activated by a depolarizing voltage command. This compound also inhibited the muscarine activated outward current with an IC50 of 6 nM. These results confirm UCL 1684 to be the most potent non-peptidic blocker of the apamin-sensitive Ca2+ -activated K+ channel so far described.
authors: Department of Pharmacology, University College London, UK. p.dunn@ucl.ac.uk
authors: P M
authors: PM
authors: Dunn
mesh_terms: D000311:Adrenal Glands / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D000473:Alkanes / Q000737:chemistry / Q000494:pharmacology*; D000818:Animals; D001030:Apamin / Q000494:pharmacology; D002118:Calcium / Q000502:physiology; D019439:Chromaffin Cells / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D005703:Gallamine Triethiodide / Q000494:pharmacology; D008297:Male; D008564:Membrane Potentials / Q000187:drug effects; D009116:Muscarine / Q000494:pharmacology; D018721:Muscarinic Agonists / Q000494:pharmacology; D003473:Neuromuscular Nondepolarizing Agents / Q000494:pharmacology; D018408:Patch-Clamp Techniques; D026902:Potassium Channel Blockers; D015221:Potassium Channels / Q000502:physiology; D011806:Quinolinium Compounds / Q000737:chemistry / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: C110349:6,10-diaza-3(1,3),8(1,4)dibenzena-1,5(1,4)diquinolinacyclodecaphane; D000473:Alkanes; D018721:Muscarinic Agonists; D003473:Neuromuscular Nondepolarizing Agents; D026902:Potassium Channel Blockers; D015221:Potassium Channels; D011806:Quinolinium Compounds; D001030:Apamin; D009116:Muscarine; D005703:Gallamine Triethiodide; D002118:Calcium