Title

Amine modulation of the transient potassium current in identified cells of the lobster stomatogastric ganglion

Document Type

Article

Publication Date

1-1-2001

Abstract

The pyloric network of the stomatogastric ganglion of the lobster Panulirus interruptus is a model system used to understand how motor networks change their output to produce a variety of behaviors. The transient potassium current (I ) shapes the activity of individual pyloric neurons by affecting their rate of postinhibitory rebound and spike frequency. We used two electrode voltage clamp to study the modulatory effects of dopamine (DA), octopamine (OCT), and serotonin (5-HT) on I in the anterior burster (AB), inferior cardiac (IC), and ventricular dilator (VD) neurons of the pyloric circuit. DA significantly reduced I in the AB and IC neurons and shifted their voltages of activation (V ) and inactivation (V ) in a depolarized direction. These ionic changes contribute to the depolarization and increased firing rate of the AB and IC neurons produced by DA. Likewise, 5-HT significantly reduced I and shifted V in the depolarized direction in the IC neuron, consistent with 5-HT's enhancement of IC firing. None of the amines evoked significant changes in I in the VD neuron, suggesting that other currents mediate the amine effects on this neuron. A A A act inact A inact A

Publication Name

Journal of Neurophysiology

Volume Number

86

First Page

2957

Last Page

2965

Issue Number

6

DOI

10.1152/jn.2001.86.6.2957

This document is currently not available here.

Share

COinS