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Nitroarginine inhibits endothelium-derived relaxation
1Department of Pharmacology, Shimane Medical University, Izumo, Japan.
Japanese Journal of Pharmacology
|January 1, 1990
Summary
NG-nitro-L-arginine (NO2Arg), a novel arginine derivative, inhibits acetylcholine-induced relaxation in rabbit aorta rings. This suggests NO2Arg is a potent inhibitor of endothelium-derived relaxation, impacting vascular function.
Area of Science:
- Pharmacology
- Physiology
- Vascular Biology
Background:
- Endothelium-derived relaxing factors (EDRFs) mediate vascular relaxation.
- Acetylcholine is a key mediator of endothelium-dependent vasodilation.
Purpose of the Study:
- To investigate the effects of NG-nitro-L-arginine (NO2Arg) on acetylcholine-induced relaxation.
- To determine if NO2Arg inhibits endothelium-derived relaxation.
Main Methods:
- Studied the relaxation of rabbit thoracic aorta ring preparations.
- Administered acetylcholine, NG-nitro-L-arginine (NO2Arg), L-arginine, glyceryltrinitrate, and papaverine.
- Quantified relaxation responses dose-dependently.
Main Results:
- NO2Arg dose-dependently inhibited acetylcholine-induced relaxation.
- Maximum relaxation was reduced to 10.1 +/- 4.3% with 10(2) microM NO2Arg.
- L-arginine, glyceryltrinitrate, and papaverine effects were not altered by NO2Arg.
Conclusions:
- NO2Arg is a novel inhibitor of endothelium-derived relaxation.
- NO2Arg's inhibitory action is specific to the EDRF pathway.
- NO2Arg provides a valuable tool for studying vascular relaxation mechanisms.