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Neurokinin 3 receptor activation potentiates the psychomotor and nucleus accumbens dopamine response to cocaine, but not its place conditioning effects.
Eur J Neurosci. 2007 Apr; 25(8):2457-72.EJ

Abstract

Neurokinin(3) receptors (NK(3)-Rs) have been implicated in psychomotor activity and reinforcement mechanisms. Recently, we showed that NK(3)-R antagonism blocked the psychostimulant properties of cocaine both in rats and in primates. Here, using in vivo microdialysis in the nucleus accumbens (NAc) of freely moving rats, we investigated the effect of the NK(3)-R agonist senktide (0.2 and 0.4 mg/kg s.c.) on the cocaine-evoked increase in dopamine. Cocaine (10 mg/kg i.p.) increased dopamine levels to 404 and 480% of baseline in the core and shell of the NAc, respectively. Pretreatment with senktide at a dose of 0.2 mg/kg potentiated this effect to 666 (core) and 869% (shell) of baseline, without having any effect on dopamine when given alone. Behavioural measurements revealed that 0.2 mg/kg senktide also potentiated the cocaine-induced increase in horizontal and vertical activity. Senktide alone induced a short-lasting increase in activity that was not accompanied by any alterations of the neurochemical parameters. In conditioned place preference (CPP) experiments, senktide pretreatment did not alter CPP induced by cocaine (5 and 10 mg/kg i.p.), and had no effect when given alone. Likewise, cocaine-conditioned locomotor activity was not affected by the NK(3)-R agonist. However, as in the microdialysis studies, cocaine-induced (5 and 10 mg/kg i.p.) hyperactivity was potentiated by senktide, and there was evidence for a facilitation of sensitization to the hyperlocomotor effects of cocaine by senktide. These data provide evidence that NK(3)-Rs are involved in the control of the hyperlocomotor and NAc DA response to cocaine, but not in cocaine-induced CPP.

Authors+Show Affiliations

Institute of Physiological Psychology and Center for Biological and Medical Research, University of Düsseldorf, Universitätsstr. 1, D-40225, Düsseldorf, Germany.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17445241

Citation

Jocham, Gerhard, et al. "Neurokinin 3 Receptor Activation Potentiates the Psychomotor and Nucleus Accumbens Dopamine Response to Cocaine, but Not Its Place Conditioning Effects." The European Journal of Neuroscience, vol. 25, no. 8, 2007, pp. 2457-72.
Jocham G, Lauber AC, Müller CP, et al. Neurokinin 3 receptor activation potentiates the psychomotor and nucleus accumbens dopamine response to cocaine, but not its place conditioning effects. Eur J Neurosci. 2007;25(8):2457-72.
Jocham, G., Lauber, A. C., Müller, C. P., Huston, J. P., & de Souza Silva, M. A. (2007). Neurokinin 3 receptor activation potentiates the psychomotor and nucleus accumbens dopamine response to cocaine, but not its place conditioning effects. The European Journal of Neuroscience, 25(8), 2457-72.
Jocham G, et al. Neurokinin 3 Receptor Activation Potentiates the Psychomotor and Nucleus Accumbens Dopamine Response to Cocaine, but Not Its Place Conditioning Effects. Eur J Neurosci. 2007;25(8):2457-72. PubMed PMID: 17445241.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Neurokinin 3 receptor activation potentiates the psychomotor and nucleus accumbens dopamine response to cocaine, but not its place conditioning effects. AU - Jocham,Gerhard, AU - Lauber,Andrea C, AU - Müller,Christian P, AU - Huston,Joseph P, AU - de Souza Silva,M Angélica, PY - 2007/4/21/pubmed PY - 2007/7/13/medline PY - 2007/4/21/entrez SP - 2457 EP - 72 JF - The European journal of neuroscience JO - Eur. J. Neurosci. VL - 25 IS - 8 N2 - Neurokinin(3) receptors (NK(3)-Rs) have been implicated in psychomotor activity and reinforcement mechanisms. Recently, we showed that NK(3)-R antagonism blocked the psychostimulant properties of cocaine both in rats and in primates. Here, using in vivo microdialysis in the nucleus accumbens (NAc) of freely moving rats, we investigated the effect of the NK(3)-R agonist senktide (0.2 and 0.4 mg/kg s.c.) on the cocaine-evoked increase in dopamine. Cocaine (10 mg/kg i.p.) increased dopamine levels to 404 and 480% of baseline in the core and shell of the NAc, respectively. Pretreatment with senktide at a dose of 0.2 mg/kg potentiated this effect to 666 (core) and 869% (shell) of baseline, without having any effect on dopamine when given alone. Behavioural measurements revealed that 0.2 mg/kg senktide also potentiated the cocaine-induced increase in horizontal and vertical activity. Senktide alone induced a short-lasting increase in activity that was not accompanied by any alterations of the neurochemical parameters. In conditioned place preference (CPP) experiments, senktide pretreatment did not alter CPP induced by cocaine (5 and 10 mg/kg i.p.), and had no effect when given alone. Likewise, cocaine-conditioned locomotor activity was not affected by the NK(3)-R agonist. However, as in the microdialysis studies, cocaine-induced (5 and 10 mg/kg i.p.) hyperactivity was potentiated by senktide, and there was evidence for a facilitation of sensitization to the hyperlocomotor effects of cocaine by senktide. These data provide evidence that NK(3)-Rs are involved in the control of the hyperlocomotor and NAc DA response to cocaine, but not in cocaine-induced CPP. SN - 0953-816X UR - https://www.unboundmedicine.com/medline/citation/17445241/Neurokinin_3_receptor_activation_potentiates_the_psychomotor_and_nucleus_accumbens_dopamine_response_to_cocaine_but_not_its_place_conditioning_effects_ L2 - https://doi.org/10.1111/j.1460-9568.2007.05491.x DB - PRIME DP - Unbound Medicine ER -