The ORL-1 receptor system: are there opportunities for antagonists in pain therapy?

Abstract:

:Following the cloning of the classical opioid receptors (mu, delta and kappa), the opioid receptor like-1 (ORL-1) was identified as a G-protein coupled receptor (GPCR) with 65% structure homology to the other members of the opioid family. Its endogenous ligand nociception/orphanin FQ (N/OFQ) was discovered shortly thereafter, becoming the subject of investigation in numerous studies. Since activation of the ORL-1 receptor by N/OFQ leads to G alpha(i)-coupling and signal transduction similar to that of opioid receptors, N/OFQ was thought to have a role in pain modulation, similar to that of the endogenous opioids. Surprisingly, studies characterizing N/OFQ's effects on pain transmission yielded conflicting results, attributing to N/OFQ both pronociceptive and antinociceptive actions, depending on doses and routes of administration as well as species and sex of the subjects. With the development of selective and potent ORL-1 antagonists, many scientists believed these contradicting actions would be elucidated. Here we review the recent literature reporting the use of novel ORL-1 antagonists, both peptide and non-peptide, in different models of pain and discuss their use as research tools or potential drug candidates.

journal_name

Curr Top Med Chem

authors

Fioravanti B,Vanderah TW

doi

10.2174/156802608786264227

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

1442-51

issue

16

eissn

1568-0266

issn

1873-4294

journal_volume

8

pub_type

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