Differences in extracellular dopamine concentrations in the nucleus accumbens during response-dependent and response-independent cocaine administration in the rat

被引:238
作者
Hemby, SE [1 ]
Co, C [1 ]
Koves, TR [1 ]
Smith, JE [1 ]
Dworkin, SI [1 ]
机构
[1] WAKE FOREST UNIV, BOWMAN GRAY SCH MED, DEPT PHYSIOL & PHARMACOL, CTR NEUROBIOL INVEST DRUG ABUSE, WINSTON SALEM, NC 27157 USA
关键词
cocaine; nucleus accumbens; dopamine; self-administration; reinforcement; microdialysis;
D O I
10.1007/s002130050365
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Studies indicate that nucleus accumbens (NAcc) dopamine neurotransmission is involved in the reinforcing and direct effects of cocaine. The present study was initiated to explore further the relationship of NAcc extracellular dopamine concentrations ([DA](e)) and cocaine self-administration using a yoked littermate design, Tn the first experiment, one rat from each litter was trained to self-administer cocaine IV (SA; 0.33 mg/inf) under a fixed ratio 2 schedule, while a second rat received simultaneous infusions of cocaine yoked to the infusions of the SA (YC), NAcc [DA](e) and cocaine concentrations ([COC]) were assessed during the test sessions using in vivo microdialysis combined with microbore HPLC procedures. [DA](e) and [COG] were significantly elevated in the SA and YC groups during the self-administration session; however, [DA](e) were greater in the SA group compared to the YC group in the first hour of the session, even though [COC] were not significantly different. On the following day, the rats previously allowed to self-administer cocaine were administered response-independent cocaine infusions yoked to the infusion pattern from the previous day. [DA](e) were significantly elevated above baseline levels during the session but were significantly less than concentrations obtained when cocaine was self-administered by these subjects. [COG] during the sessions were not significantly different between the two days. Baseline [DA](e) were not significantly different between the SA and YC groups or between Day 1 and Day 2. Furthermore, there was no significant difference in the in vitro probe recovery between one and two days following probe implantation. These results suggest that the context in which cocaine was administered significantly altered the neurochemical response to equivalent brain concentrations of cocaine. NAcc [DA](e) was significantly increased when the delivery of cocaine infusions was contingent on the behavior of the rat, indicative of a role in the neural processes underlying cocaine reinforcement.
引用
收藏
页码:7 / 16
页数:10
相关论文
共 59 条
[1]  
[Anonymous], 1989, Applied Linear Regression Models
[2]   EVIDENCE FOR INVOLVEMENT OF BOTH D1 AND D2 RECEPTORS IN MAINTAINING COCAINE SELF-ADMINISTRATION [J].
BRITTON, DR ;
CURZON, P ;
MACKENZIE, RG ;
KEBABIAN, JW ;
WILLIAMS, JEG ;
KERKMAN, D .
PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR, 1991, 39 (04) :911-915
[3]  
CAINE SB, 1994, J PHARMACOL EXP THER, V270, P209
[4]   AMPHETAMINE, COCAINE, PHENCYCLIDINE AND NOMIFENSINE INCREASE EXTRACELLULAR DOPAMINE CONCENTRATIONS PREFERENTIALLY IN THE NUCLEUS ACCUMBENS OF FREELY MOVING RATS [J].
CARBONI, E ;
IMPERATO, A ;
PEREZZANI, L ;
DICHIARA, G .
NEUROSCIENCE, 1989, 28 (03) :653-661
[5]   FIRING PATTERNS OF NUCLEUS-ACCUMBENS NEURONS DURING COCAINE SELF-ADMINISTRATION IN RATS [J].
CARELLI, RM ;
KING, VC ;
HAMPSON, RE ;
DEADWYLER, SA .
BRAIN RESEARCH, 1993, 626 (1-2) :14-22
[6]   COCAINE SELF-ADMINISTRATION IS INCREASED BY BOTH D1 AND D2 DOPAMINE ANTAGONISTS [J].
CORRIGALL, WA ;
COEN, KM .
PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR, 1991, 39 (03) :799-802
[7]  
DELFS JM, 1990, J NEUROSCI, V10, P303
[8]   BLOCKADE OF COCAINE REINFORCEMENT IN RATS WITH DOPAMINE RECEPTOR BLOCKER PIMOZIDE, BUT NOT WITH NORADRENERGIC BLOCKERS PHENTOLAMINE OR PHENOXYBENZAMINE [J].
DEWIT, H ;
WISE, RA .
CANADIAN JOURNAL OF PSYCHOLOGY-REVUE CANADIENNE DE PSYCHOLOGIE, 1977, 31 (04) :195-203
[9]  
DICHIARA G, 1988, P NATL ACAD SCI USA, V85, P5274
[10]   RESPONSE DEPENDENT VERSUS RESPONSE-INDEPENDENT PRESENTATION OF COCAINE - DIFFERENCES IN THE LETHAL EFFECTS OF THE DRUG [J].
DWORKIN, SI ;
MIRKIS, S ;
SMITH, JE .
PSYCHOPHARMACOLOGY, 1995, 117 (03) :262-266