Effect of N-nitro-L-arginine on the development of opiate tolerance and dependence
- VernacularTitle:N-硝基-L-精氨酸对阿片类物质耐受及依赖形成的影响
- Author:
Xingwang WAN
;
Mao HUANG
;
Yaqin HE
- Publication Type:Journal Article
- Keywords:
Nitroarginine;
Morphine;
Tolerance;
Morphine dependence
- From:
Chinese Journal of Anesthesiology
1994;0(06):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of N-nitro-L-arginine (NO2Arg) on the development of morphine tolerance and dependence.Methods Forty male SD rats weighing (180 ? 18)g were randomly divided into 5 groups for the study of morphine physical dependence and tolerance : group Ⅰ normal saline; group Ⅱ morphine; group Ⅲ morphine + 1 mg?kg-1 NO2Arg; group Ⅳ morphine + 5 mg?kg-1 NO2 Arg ; group Ⅴ morphine +20 mg?kg-1 NO2Arg. Twenty-four male Kunming mice weighing (20.0 ? 2.3)g were randomly divided into 3 groups for the study of psychological dependence: group Ⅵ morphine; group Ⅶ dihydro etorphine; group Ⅷ normal saline. The morphine physical dependence was induced by dose increment. The degree of morphine tolerance was assessed by the pain threshold to heat radiation using tail-flick test. The degree of morphine physical dependence was determined by evaluating the abstinence syndrome precipitated by 4 mg?kg -1 naloxone. The psychological dependence of mice was evaluated by conditioned place preference. Results Consecutive injection of NO2Arg inhibited the development of morphine tolerance in a dose-dependent manner. 5 mg?kg-1 NO2 Arg suppressed most abstinent symptoms of morphine dependent rats. The duration when morphine and dihydro etorphine psychologically dependent mice stayed in the preferred compartment increased significantly from (6.1? 2.0)min and (8.0?0.7)min to (9.3?1. l)min and (9.5 ? 1.2) min by 4 mg?kg-1 NO2 Arg. Conclusion NO2 Arg can inhibit the development of morphine tolerance and dependence and reverse the existing psychological dependence.
