Development of the fast, transient outward K+ current in embryonic sympathetic neurones

Brain Res. 1986 Jul 16;378(1):197-202. doi: 10.1016/0006-8993(86)90306-9.


Voltage-activated outward potassium (K+) currents in developing sympathetic neurones, dissociated from the rat superior cervical ganglion (SCG), were studied using the whole-cell patch clamp recording technique. In voltage-clamped neonatal SCG cells, two voltage-dependent K+ currents were measured: the fast, transient K+ current, IA; and, the slower activating, non-inactivating delayed rectifier, IK. Only IK, however, appeared to be present in SCG neurones isolated from early embryonic (E14.5-16.5) rat pups; IA was not observed in these cells. When these embryonic neurones were maintained in cell culture, IA developed over a time course (approximately 4-6 days) similar to that seen in vivo. IA, therefore, which appears to facilitate the fast repolarization phase of the action potential in rat SCG neurones, is the last voltage-activated current to develop in these cells.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Action Potentials*
  • Animals
  • Animals, Newborn
  • Calcium / physiology
  • Cells, Cultured
  • Drosophila
  • Ganglia, Sympathetic / embryology
  • Ganglia, Sympathetic / physiology*
  • Ion Channels / physiology*
  • Neural Conduction
  • Potassium / metabolism*
  • Rats


  • Ion Channels
  • Potassium
  • Calcium