| Popis: |
The L-type Ca2+ channel (Ca V 1.2) shows clear Ca2+-dependent facilitation and inactivation. Here we have examined the effects of calmodulin (CaM) and Ca2+ on Ca2+ channel in guinea-pig ventricular myocytes in the inside-out patch mode, where rundown of the channels was controlled. At a free [Ca2+] of 0.1 μM, CaM (0.15, 0.7, 1.4, 2.1, 3.5, and 7.0 μM) + ATP (2.4 mM) induced channel activities of 27%, 98%, 142%, 222%, 65%, and 20% relative to the control activity, respectively, showing a bell-shaped relationship. Similar results were observed at a free [Ca2+] |
