TY - JOUR
T1 - NS 1619 activates BKCa channel activity in rat cortical neurones
AU - Lee, Kevin
AU - Rowe, Iain C.M.
AU - Ashford, Michael L.J.
PY - 1995/7
Y1 - 1995/7
N2 - Single channel recordings of large conductance Ca2+-activated K+ (BKCa) channels were made from neurones isolated from rat motor cortex. Application of levcromakalim, pinacidil or diazoxide had no effect on BKCa channel activity in excised patches. In contrast, NS 1619 (1-(2′-hydroxy-5′-trifluoromethylphenyl)-5-trifluoromethyl-2(3H)benzimidazalone) induced concentration-dependent activation of BKCa channels with a calculated EC50 of 32 μM. The NS 1619-induced activity was dependent on the presence of free Ca2+ at the intracellular surface, but was not associated with a change in channel voltage sensitivity. Niflumic acid had no effect on BKCa activity per se but prevented NS 1619-mediated activation.
AB - Single channel recordings of large conductance Ca2+-activated K+ (BKCa) channels were made from neurones isolated from rat motor cortex. Application of levcromakalim, pinacidil or diazoxide had no effect on BKCa channel activity in excised patches. In contrast, NS 1619 (1-(2′-hydroxy-5′-trifluoromethylphenyl)-5-trifluoromethyl-2(3H)benzimidazalone) induced concentration-dependent activation of BKCa channels with a calculated EC50 of 32 μM. The NS 1619-induced activity was dependent on the presence of free Ca2+ at the intracellular surface, but was not associated with a change in channel voltage sensitivity. Niflumic acid had no effect on BKCa activity per se but prevented NS 1619-mediated activation.
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-0029035543&partnerID=MN8TOARS
U2 - 10.1016/0014-2999(95)00251-F
DO - 10.1016/0014-2999(95)00251-F
M3 - Article
SN - 0014-2999
VL - 280
SP - 215
EP - 219
JO - European Journal of Pharmacology
JF - European Journal of Pharmacology
IS - 2
ER -