Publication Date:
1995-11-03
Description:
A heptadecapeptide was identified and purified from porcine brain tissue as a ligand for an orphan heterotrimeric GTP-binding protein (G protein)-coupled receptor (LC132) that is similar in sequence to opioid receptors. This peptide, orphanin FQ, has a primary structure reminiscent of that of opioid peptides. Nanomolar concentrations of orphanin FQ inhibited forskolin-stimulated adenylyl cyclase activity in cells transfected with LC132. This inhibitory activity was not affected by the addition of opioid ligands, nor did the peptide activate opioid receptors. Orphanin FQ bound to its receptor in a saturable manner and with high affinity. When injected intracerebroventricularly into mice, orphanin FQ caused a decrease in locomotor activity but did not induce analgesia in the hot-plate test. However, the peptide produced hyperalgesia in the tail-flick assay. Thus, orphanin FQ may act as a transmitter in the brain by modulating nociceptive and locomotor behavior.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reinscheid, R K -- Nothacker, H P -- Bourson, A -- Ardati, A -- Henningsen, R A -- Bunzow, J R -- Grandy, D K -- Langen, H -- Monsma, F J Jr -- Civelli, O -- DA 08562/DA/NIDA NIH HHS/ -- DA 09620/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 1995 Nov 3;270(5237):792-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Pharma Division, Hoffmann-La Roche AG, Basel, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7481766" target="_blank"〉PubMed〈/a〉
Keywords:
Adenylyl Cyclase Inhibitors
;
Amino Acid Sequence
;
Analgesics/pharmacology
;
Animals
;
CHO Cells
;
Colforsin/pharmacology
;
Cricetinae
;
GTP-Binding Proteins/*metabolism
;
Hypothalamus/chemistry
;
Injections, Intraventricular
;
Injections, Spinal
;
Ligands
;
Mice
;
Molecular Sequence Data
;
Motor Activity/drug effects
;
Opioid Peptides/chemistry/*isolation & purification/*metabolism/pharmacology
;
Pain Measurement
;
Receptors, Neuropeptide/*metabolism
;
Receptors, Opioid/*metabolism
;
Swine
;
Transfection
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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