U50,488H depresses pulmonary pressure in rats subjected to chronic hypoxia.

Abstract

In this study, we determined the effect of U50,488H (a selective kappa-opioid receptor agonist) on pulmonary artery in rats and investigated its prevention and treatment effects on hypoxic pulmonary hypertension (HPH). Isolated pulmonary arterial rings were superfused and the tension of the vessel was measured. The model of HPH was developed and indexes for hemodynamics and right ventricular hypertrophy were measured. We found that U50,488H relaxed the pulmonary artery rings in a dose-dependent manner and the effect was abolished by nor-binaltorphimine, a selective kappa-opioid receptor antagonist. Intravenous administration of U50,488H significantly lowered mean pulmonary artery pressure (mPAP) in normal rats and this effect was also abolished by nor-binaltorphimine. Hypoxia induced severe HPH in rats and intraperitoneal administration of U50,488H (every other day) during chronic hypoxia reduced mPAP and attenuated right ventricular hypertrophy compared with the control group. Moreover, acute intravenous administration of U50,488H after the rats subjected to chronic hypoxia for 4 weeks significantly lowered mPAP. Thus, U50,488H has significant vasorelaxant effect in rat pulmonary artery and has certain preventive and therapeutic application in HPH.

• Authors: Jian-Ming Pei, Xin Sun, Hai-Tao Guo, Sai Ma, Yi-Min Zang, Shun-Yan Lu, Hui Bi, Yue-Min Wang, Heng Ma, Xin-Liang Ma
• Journal: Journal of cardiovascular pharmacology (J Cardiovasc Pharmacol) Vol. 47 Issue 4 Pg. 594-8 (Apr 2006) ISSN: 0160-2446 [Print] United States
• PMID: 16680074 (Publication Type: Journal Article)

Chemical References

• Antihypertensive Agents
• 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer

Topics

• 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer (pharmacology)
• Animals
• Antihypertensive Agents (pharmacology)
• Blood Pressure (drug effects)
• Chronic Disease
• Dose-Response Relationship, Drug
• Hypertension, Pulmonary (physiopathology, prevention & control)
• Hypertrophy, Right Ventricular (physiopathology, prevention & control)
• Hypoxia (physiopathology)
• In Vitro Techniques
• Injections, Intravenous
• Male
• Perfusion
• Pulmonary Artery (physiopathology)
• Pulmonary Circulation (drug effects)
• Rats
• Rats, Sprague-Dawley