SyncroPatch 384 application note: (1.6 MB)
Cells were kindly provided by SB Drug Discovery and Charles River.
Even in manual patch clamp experiments, fluoride has been used to record voltage gated Na+ channels for over 20 years, despite known effects on voltage dependence of conductance, and steady-state fast inactivation and its inhibition of protein phosphatase. Fluoride is used because it improves the seal and allows stable measurements to be performed over long periods of time. However, because there are some experiments where it is advantageous to use physiological, fluoride-free internal solutions and external solution that does not use divalent ‘seal enhancer’ solutions, we have developed a method that allows fluoride-free, physiological solutions to be used with good success rates. We demonstrate this using the cardiac ion channels hERG expressed in HEK293 cells (SB Drug Discovery) and NaV1.5 expressed in CHO cells (Charles River).