Alteration of calcium conductances and outward current by cyclic adenosine monophosphate (cAMP) in neurons of Limax maximus.

Abstract:

:Membrane responses to cyclic adenosine monophosphate (cAMP) injections have been studied by means of voltage clamp, Ca-indicator dye, and ion substitution techniques in identified neurons from the abdominal ganglion of Limax maximus. The ventral abdominal giant cell (AGC) displayed a response consisting of a decrease in outward current usually accompanied by a smaller enhancement of voltage-gated Ca2+ influx. Both responses were eliminated by external Cd2+ or Mn2+ and required membrane voltages more positive than -40 mV for expression. The enhanced influx persisted in Ba2+-substituted saline, while the decrease in outward current was blocked. A group of dorsal neurons (RD1-3, LD1) showed a mixed Na-Ca influx induced by cAMP that could be activated over a wide range of membrane potentials (less than -100 to greater than -20 mV). This flux caused a measurable increase in internal Ca2+. The influx was insensitive to Cd2+ and Mn2+ but was reduced by prolonged exposure to Co2+. The relative magnitude of the Na-Ca flux ratio showed considerable variation between specimens. In immature animals the Ca component was absent. The results demonstrated that elevation of intracellular cAMP can cause cell-specific changes of membrane conductance within closely associated neurons.

journal_name

Cell Mol Neurobiol

authors

Hockberger P,Connor JA

doi

10.1007/BF00733595

subject

Has Abstract

pub_date

1984-12-01 00:00:00

pages

319-38

issue

4

eissn

0272-4340

issn

1573-6830

journal_volume

4

pub_type

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