Opioid receptor independent inhibition of Ca2+ and K+ currents in NG108-15 cells by the kappa opioid receptor agonist U50488H.

Abstract:

:The whole-cell patch clamp technique was used to investigate the actions of the opioid agonist U50488H on Ca2+ and K+ currents in differentiated NG108-15 cells. U50488H (5-50 microM) caused a concentration-dependent, reversible inhibition of high voltage-activated Ca2+ currents which persisted in the presence of nifedipine (2 microM), indicating a blockade of N-type Ca2+ channels. The actions of U50488H were also observed in the presence of 30 microM naloxone, which fully abolished current inhibition caused by a selective delta opioid receptor agonist. U50488H also inhibited Ca(2+)-insensitive, voltage-gated K+ currents in NG108-15 cells in the presence of naloxone. Our results indicate that U50488H can inhibit neuronal ionic channels via a mechanism which does not involve activation of kappa opioid receptors.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Carpenter E,Gent JP,Peers C

doi

10.1097/00001756-199607290-00024

subject

Has Abstract

pub_date

1996-07-29 00:00:00

pages

1809-12

issue

11

eissn

0959-4965

issn

1473-558X

journal_volume

7

pub_type

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