OFQ reverses the kappa-opioid receptor-mediated depression of calcium current in rat dorsal root ganglion neurons.

Abstract:

:Since the characterization of orphanin FQ (OFQ), the endogenous ligand of ORL1 receptor, much work has focused on its physiological functions. OFQ was reported to antagonize the effect of opioid-induced antinociception, although its mechanism remains obscure. In the present study, whole-cell patch clamp recording technique was used to observe if OFQ can reverse the inhibition of calcium current produced by the kappa-opioid agonist U50,488H (U50) in acutely dissociated rat DRG neurons. The concentrations of OFQ and U50 were 50 nM and 10 microM, respectively. Among 49 cells recorded, the calcium channel currents of 37 (75.5%) cells were inhibited by U50, of which 30 (81.1%) cells could be reversed by OFQ. It was interesting to note the similarity between OFQ and the well characterized anti-opioid peptide CCK-8 in that it reversed kappa-opioid receptor agonist induced suppression on calcium channel current, while by itself showed a calcium channel suppressive effect. Thus OFQ may be regarded as another anti-opioid peptide.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Zhang M,Sun QL,Wan Y,Yao L,Yu YX,Han JS

doi

10.1097/00001756-199806220-00034

subject

Has Abstract

pub_date

1998-06-22 00:00:00

pages

2095-8

issue

9

eissn

0959-4965

issn

1473-558X

journal_volume

9

pub_type

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