Dynorphin reduces calcium-dependent action potential duration by decreasing voltage-dependent calcium conductance.

Abstract:

:The opioid peptide dynorphin decreased somatic calcium-dependent action potential duration in a portion of mouse dorsal root ganglion (DRG) neurons without altering resting membrane potential or conductance. Dynorphin action was antagonized by naloxone. Responses of DRG neurons to dynorphin differed from responses to the opioid peptides leucine-enkephalin, which binds preferentially to delta-opiate receptors, and morphiceptin, which binds preferentially to mu-opiate receptors. Firstly, many DRG neurons responded to dynorphin but not to leucine-enkephalin or morphiceptin. Secondly, dynorphin responses, unlike leucine-enkephalin or morphiceptin responses, persisted following intracellular injection of cesium, a potassium channel blocker. We suggest that dynorphin acts at an opiate receptor distinct from mu- and delta-receptors and that this receptor is coupled to a voltage-dependent calcium channel.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Werz MA,Macdonald RL

doi

10.1016/0304-3940(84)90439-7

subject

Has Abstract

pub_date

1984-05-04 00:00:00

pages

185-90

issue

2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(84)90439-7

journal_volume

46

pub_type

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