[Nphe1]nociceptin(1-13)-NH2 antagonizes nociceptin-induced hypotension, bradycardia, and hindquarters vasodilation in the anesthetized rat.
Can J Physiol Pharmacol
; 80(1): 31-5, 2002 Jan.
Article
in En
| MEDLINE
| ID: mdl-11911223
ABSTRACT
The purpose of this study was to investigate the effects of [Nphe1]nociceptin(1-13)-NH2 on nociceptin-induced decreases in mean arterial pressure (MAP), heart rate (HR), and hindquarters vascular bed resistance (HVBR) of the anesthetized rat. The results showed that i.c.v. or i.v. [Nphe1]nociceptin(1-13)-NH2 (1.5-12 nmol/kg and 5-120 nmol/kg, respectively) could antagonize the depressor effects of i.c.v. or i.v. nociceptin (3 and 30 nmol/kg, respectively) on MAP and HR. Furthermore, [Nphe1]nociceptin(1-13)-NH2 (5-120 nmol/kg) could reverse nociceptin (30 nmol/kg)-induced decrease of HVBR. However, [Nphe1]nociceptin(1-13)-NH2 had no significant effects on similar effects induced by morphine. Our results suggest that [Nphe1]nociceptin(1-13)-NH2 acts as a selective antagonist of the nociceptin receptor in the cardiovascular system of the rat.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Peptide Fragments
/
Vasodilation
/
Vasodilator Agents
/
Blood Pressure
/
Opioid Peptides
/
Heart Rate
/
Anesthesia
Limits:
Animals
Language:
En
Journal:
Can J Physiol Pharmacol
Year:
2002
Document type:
Article