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Amphetamine, cocaine, and fencamfamine: relationship between locomotor and stereotypy response profiles and caudate and accumbens dopamine dynamics.
J Neurosci 1991; 11(9):2703-12JN

Abstract

Using in vivo microdialysis, the caudate and nucleus accumbens dopamine (DA) responses to the psychomotor stimulants amphetamine (AMPH), cocaine (COC), and fencamfamine (FCF) were evaluated in rats concurrent with characterization of their behavioral response profiles. Doses of each stimulant that produced either enhanced locomotion or a prolonged period of intense focused stereotypies were examined to evaluate the quantitative relationships between stimulant-induced behaviors and changes in DA dynamics and to test the hypothesis that a balance between mesostriatal and mesolimbic DA activity contributes to the appearance of specific stimulant-induced behaviors. Although 10 mg/kg COC and 1.7 mg/kg FCF promoted levels of locomotor activity substantially greater than 0.5 mg/kg AMPH, the magnitude of the DA increases in both caudate and accumbens were markedly less than was obtained following AMPH. Thus, stimulant-induced locomotion appears to be dissociated from the quantitative DA response in both brain regions. This behavioral/DA dissociation was also apparent at higher doses of AMPH (2.5 mg/kg), COC (40 mg/kg), and FCF (6 mg/kg), doses that promoted a behavioral pattern that included a prolonged period of intense stereotypy. Indeed, the regional DA responses to these high doses of COC and FCF were substantially less than the response to 0.5 mg/kg AMPH. Furthermore, there were no differences in the ratio of the caudate and accumbens DA responses as a function of dose for any of the three drugs. Thus, the balance between the regional DA activation does not appear to regulate the expression of the behavioral response. Additionally, the effects of these stimulants on regional DA metabolite concentrations were compared. The results indicate that AMPH promoted an identical pattern of effects on caudate and accumbens DA metabolites, suggesting that similar mechanisms govern the dynamics of DA in response to AMPH in both brain regions. In contrast, the DA uptake blockers promoted some region-specific effects on DA metabolites that may be due to regional differences in the DA metabolism and rates of impulse flow.

Authors+Show Affiliations

Department of Psychiatry, University of California, San Diego, La Jolla 92093.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

1715389

Citation

Kuczenski, R, et al. "Amphetamine, Cocaine, and Fencamfamine: Relationship Between Locomotor and Stereotypy Response Profiles and Caudate and Accumbens Dopamine Dynamics." The Journal of Neuroscience : the Official Journal of the Society for Neuroscience, vol. 11, no. 9, 1991, pp. 2703-12.
Kuczenski R, Segal DS, Aizenstein ML. Amphetamine, cocaine, and fencamfamine: relationship between locomotor and stereotypy response profiles and caudate and accumbens dopamine dynamics. J Neurosci. 1991;11(9):2703-12.
Kuczenski, R., Segal, D. S., & Aizenstein, M. L. (1991). Amphetamine, cocaine, and fencamfamine: relationship between locomotor and stereotypy response profiles and caudate and accumbens dopamine dynamics. The Journal of Neuroscience : the Official Journal of the Society for Neuroscience, 11(9), pp. 2703-12.
Kuczenski R, Segal DS, Aizenstein ML. Amphetamine, Cocaine, and Fencamfamine: Relationship Between Locomotor and Stereotypy Response Profiles and Caudate and Accumbens Dopamine Dynamics. J Neurosci. 1991;11(9):2703-12. PubMed PMID: 1715389.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Amphetamine, cocaine, and fencamfamine: relationship between locomotor and stereotypy response profiles and caudate and accumbens dopamine dynamics. AU - Kuczenski,R, AU - Segal,D S, AU - Aizenstein,M L, PY - 1991/9/1/pubmed PY - 1991/9/1/medline PY - 1991/9/1/entrez SP - 2703 EP - 12 JF - The Journal of neuroscience : the official journal of the Society for Neuroscience JO - J. Neurosci. VL - 11 IS - 9 N2 - Using in vivo microdialysis, the caudate and nucleus accumbens dopamine (DA) responses to the psychomotor stimulants amphetamine (AMPH), cocaine (COC), and fencamfamine (FCF) were evaluated in rats concurrent with characterization of their behavioral response profiles. Doses of each stimulant that produced either enhanced locomotion or a prolonged period of intense focused stereotypies were examined to evaluate the quantitative relationships between stimulant-induced behaviors and changes in DA dynamics and to test the hypothesis that a balance between mesostriatal and mesolimbic DA activity contributes to the appearance of specific stimulant-induced behaviors. Although 10 mg/kg COC and 1.7 mg/kg FCF promoted levels of locomotor activity substantially greater than 0.5 mg/kg AMPH, the magnitude of the DA increases in both caudate and accumbens were markedly less than was obtained following AMPH. Thus, stimulant-induced locomotion appears to be dissociated from the quantitative DA response in both brain regions. This behavioral/DA dissociation was also apparent at higher doses of AMPH (2.5 mg/kg), COC (40 mg/kg), and FCF (6 mg/kg), doses that promoted a behavioral pattern that included a prolonged period of intense stereotypy. Indeed, the regional DA responses to these high doses of COC and FCF were substantially less than the response to 0.5 mg/kg AMPH. Furthermore, there were no differences in the ratio of the caudate and accumbens DA responses as a function of dose for any of the three drugs. Thus, the balance between the regional DA activation does not appear to regulate the expression of the behavioral response. Additionally, the effects of these stimulants on regional DA metabolite concentrations were compared. The results indicate that AMPH promoted an identical pattern of effects on caudate and accumbens DA metabolites, suggesting that similar mechanisms govern the dynamics of DA in response to AMPH in both brain regions. In contrast, the DA uptake blockers promoted some region-specific effects on DA metabolites that may be due to regional differences in the DA metabolism and rates of impulse flow. SN - 0270-6474 UR - https://www.unboundmedicine.com/medline/citation/1715389/Amphetamine_cocaine_and_fencamfamine:_relationship_between_locomotor_and_stereotypy_response_profiles_and_caudate_and_accumbens_dopamine_dynamics_ L2 - http://www.jneurosci.org/cgi/pmidlookup?view=long&pmid=1715389 DB - PRIME DP - Unbound Medicine ER -