Intracellular injection of cAMP induces a long-term reduction of neuronal K+ currents.
Intracellular signals that trigger long-term (24-hour) changes in membrane currents in identified neurons of Aplysia have been examined in order to understand the cellular mechanisms underlying long-term sensitization. Adenosine 3',5'-monophosphate (cAMP) was directly injected into individual sensory neurons to mimic the effects of sensitization training at the single cell level. Potassium currents of these cells were reduced 24 hours after injection of cAMP; these currents were similar to those reduced 24 hours after behavioral sensitization. These results suggest that cAMP is part of the intracellular signal that induces long-term sensitization in Aplysia.
Scholz
K P
KP
Department of Neurobiology and Anatomy, University of Texas Medical School, Houston 77225.
Byrne
J H
JH
D000249:Adenosine Monophosphate / Q000494:pharmacology; D000818:Animals; D001048:Aplysia / Q000502:physiology*; D002462:Cell Membrane / Q000502:physiology; D000242:Cyclic AMP / Q000494:pharmacology*; D004553:Electric Conductivity; D008564:Membrane Potentials / Q000187:drug effects; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D011188:Potassium / Q000378:metabolism*
D000249:Adenosine Monophosphate; D000242:Cyclic AMP; D011188:Potassium