REAL-TIME DETECTION OF ACUTE (IP) COCAINE-ENHANCED DOPAMINE AND SEROTONIN RELEASE IN VENTROLATERAL NUCLEUS-ACCUMBENS OF THE BEHAVING NORWAY RAT

被引:42
作者
BRODERICK, PA
KORNAK, EP
ENG, F
WECHSLER, R
机构
[1] CUNY, GRAD SCH, DEPT BIOL, NEW YORK, NY 10031 USA
[2] CUNY, GRAD SCH, DEPT PSYCHOL, NEW YORK, NY 10031 USA
关键词
COCAINE; PSYCHOSTIMULANT BEHAVIOR; DOPAMINE; SEROTONIN; VENTROLATERAL NUCLEUS ACCUMBENS (VLNACC); IN-VIVO ELECTROCHEMISTRY (VOLTAMMETRY); ANXIETY; AGORAPHOBIA;
D O I
10.1016/0091-3057(93)90567-D
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Cocaine (10 mg/kg), administered intraperitoneal (IP), was studied for its effects on dopamine (DA) and serotonin (5-HT) release in ventrolateral nucleus accumbens (vlNAcc) of conscious and behaving male, virus-free, Sprague-Dawley rats with in vivo electrochemistry (voltammetry). Miniature stearate probes detected DA and 5-HT release, on line and within a temporal resolution of seconds. Psychostimulant behaviors, in the form of four behavioral components (i.e., the classically DA-dependent behaviors of locomotor activity [ambulations], rearing, and stereotypy, and a 5-HT-ergic behavior, central ambulations) were studied concurrently with infrared photobeam detection. The results show that (IP) cocaine significantly increased vlNAcc DA release (p < 0.0001) and 5-HT release (p < 0.0012). Each of the four parameters of cocaine-induced psychostimulant behavior was concurrently and significantly increased as well (ambulations: p < 0.0001; rearing: p < 0.0008; stereotypy: p < 0.0004; central ambulations: p < 0.0082). Moreover, exactly coincident data points for DA and 5-HT release occurred 10 and 40 min after (IP) cocaine administration. Cocaine-induced DA and 5-HT release were highly and positively correlated during the first hour of study (p < 0.01). As expected, increased DA release in vlNAcc after cocaine administration was significantly and positively correlated with classically DA-dependent behaviors (first- and second-hour effects) (p < 0.01) and with the 5-HT-ergic behavior, central ambulations (p < 0.01). Also, cocaine-induced 5-HT release was significantly and positively correlated with 5-HT behavior (p < 0.01). However, not as expected, classically DA-dependent behaviors were more positively correlated with cocaine-induced 5-HT release in vlNAcc throughout the two-hour period of study. Thus, the present findings show that 5-HT is a comediator with DA in the cocaine response in vlNAcc. Importantly, 5-HT may signal the known DA response to cocaine.
引用
收藏
页码:715 / 722
页数:8
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