KCa3.1 (SK4) - Activation by Perfusion of free internal Calcium
Screenshots of the PatchControl 384 software are showing KCa3.1 raw traces and according time plots (online analysis) to a voltage ramp from -120 mV to + 60 mV over 200 ms. The application of internal Ca2+ is indicated by the yellow bar. The current increased upon application of internal Ca2+ reaching a peak within 1-2 min after the start of the perfusion. Five minutes of stable KCa3.1 current was recorded prior the channel was inhibited by cumulative additions of external Ba2+; first partly (1 mM Ba2+) and then completely (5 mM Ba2+). The recording was performed with perfectly high success rates in whole cell configuration on a multi hole chip (4 holes per well) using the SyncroPatch 384PE (a predecessor model of SyncroPatch 384).