Article (Scientific journals)
Mice lacking the melanin-concentrating hormone receptor-1 exhibit an atypical psychomotor susceptibility to cocaine and no conditioned cocaine response
Tyhon, Amélie; Adamantidis, Antoine; Foidart, Agnès et al.
2006In Behavioural Brain Research, 173 (1), p. 94-103
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Keywords :
MCHR 1 receptor; cocaine; psychomotor activation; sensitization; novelty; knockout mice; conditioned drug response; test
Abstract :
[en] The present study aimed at characterizing the acute and intermittent psychomotor responsiveness to cocaine in mice lacking the MCHR1 receptor, which is thought to modulate the mesocorticolimbic sytem functioning [Smith DG, Tzavara ET, Shaw J, Luecke S, Wade M, Davis R, et al. Mesolimbic dopamine super-sensitivity in melanin-concentrating hormone-1 receptor deficient mice. J Neurosci 2005;25:914-22]. On a first free-drug session, MCHR1-deficient mice exhibited significantly higher levels of locomotor activity elicited by the novelty of the test chambers than their wild-type counterparts. On the following day session, a first injection of 6 or 12mg/kg cocaine induced comparable dose-related psychomotor activations in both genotypes, without significant difference in the relative increase in locomotion. Over the following eight once-daily test sessions, the slight psychomotor increase induced by 6mg/kg was equivalent in both genotypes and constant over the sessions. At 12mg/kg, cocaine induced a clear-cut incremental responsiveness to cocaine in both genotypes on the three first sessions; on the following sessions, only the wild-types displayed an incremental responsiveness until the last session, a sensitized effect that was confirmed for the wild-types but not for the knockouts on a subsequent sensitization test (cocaine challenge). Finally, the knockouts did not exhibit any sign of cocaine-conditioning (saline challenge), contrarily to the wild-types. It is speculated that MCHR1 may contribute to the neurobiological mechanisms of conditioned cocaine-induced psychomotor effects, possibly to those underpinning sensitization, and to a lesser extent to those sub-serving acute pharmacological cocaine action.
Research center :
Centre de Neurosciences Cognitives et Comportementales - ULiège
Disciplines :
Neurosciences & behavior
Author, co-author :
Tyhon, Amélie ;  Université de Liège - ULiège > Département des sciences cognitives > Neuroscience comportementale et psychopharmacologie expér.
Adamantidis, Antoine ;  Université de Liège - ULiège > Biochimie et physiologie humaine et pathologique
Foidart, Agnès ;  Université de Liège - ULiège > Services généraux (Faculté de médecine) > Service administratif de la Faculté (Médecine)
Grisar, Thierry ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Biochimie et physiologie humaine et pathologique
Lakaye, Bernard ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Biochimie et physiologie humaine et pathologique
Tirelli, Ezio ;  Université de Liège - ULiège > Département des sciences cognitives > Neuroscience comportementale et psychopharmacologie expér.
Language :
English
Title :
Mice lacking the melanin-concentrating hormone receptor-1 exhibit an atypical psychomotor susceptibility to cocaine and no conditioned cocaine response
Publication date :
02 October 2006
Journal title :
Behavioural Brain Research
ISSN :
0166-4328
eISSN :
1872-7549
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
173
Issue :
1
Pages :
94-103
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 November 2009

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