Forskolin mimics and blocks a serotonin-sensitive decreased K+ conductance in tail sensory neurons of Aplysia.

Abstract:

:Facilitation of synaptic connections between sensory neurons and motor neurons mediating the tail-withdrawal reflex in Aplysia is produced by sensitizing stimuli. These effects can be mimicked by perfusing the pleural and pedal ganglia of a semi-intact preparation with serotonin (5-HT). In addition to the synaptic facilitation, 5-HT produces a depolarization associated with an increase in input resistance in the sensory neurons. The 5-HT-induced changes appear to be mediated by an elevation in cAMP levels. To examine further the role of cAMP in mediating the 5-HT response we utilized the potent cyclase activator forskolin. Forskolin mimics the 5-HT response and blocks the response to subsequent 5-HT applications indicating that both 5-HT and forskolin act through a common saturable mechanism. Voltage clamp and ion substitution experiments indicate that the 5-HT response is due, at least in part, to a decrease in a resting K+ conductance.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Walsh JP,Byrne JH

doi

10.1016/0304-3940(84)90342-2

subject

Has Abstract

pub_date

1984-11-23 00:00:00

pages

7-11

issue

1-2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(84)90342-2

journal_volume

52

pub_type

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