Regulation of neuronal properties by afferent connections. I. Functional changes in snail neurons following section of presysnaptic nerve fibers.
The left cerebral connective of snail ganglia containing afferent inputs to a particular neuron was sectioned. One week after the operation synaptic potentials were not obtained when the connective was stimulated, and they had not reappeared after 60 days. The current-voltage relationship of denervated cells showed a rectification in the hyperpolarizing direction, whereas that of control cells had an ohmic behavior. Depolarization or conductance changes produced by ACh or carbachol showed a supersensitivity in denervated cells, evidenced by a shift to the left of the dose-response curve and an increase of the maximal responses obtained. The reversal potential of ACh shifted from--22 mV in the control to--8 mV in denervated cells. Depolarization produced by serotonin was similar in control and denervated cells.
D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D002217:Carbachol / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005071:Evoked Potentials / Q000187:drug effects; D008564:Membrane Potentials; D009431:Neural Conduction / Q000187:drug effects; D009434:Neural Pathways; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D009475:Neurons, Afferent / Q000502:physiology; D012701:Serotonin / Q000494:pharmacology; D012908:Snails; D013569:Synapses / Q000502:physiology; D009435:Synaptic Transmission
D012701:Serotonin; D002217:Carbachol; D000109:Acetylcholine