title: Repeated administration of amphetamine induces a shift of the prefrontal cortex and basolateral amygdala motor function.
abstract: The role of the medial prefrontal cortex (mPFC) and basolateral amygdala (BLA) in the expression of behavioural locomotor sensitization to amphetamine (Amph) has been poorly studied. In the present study, we investigated how lidocaine infused in the mPFC or BLA modulated motor responses to acute and repeated (sensitization) Amph administration. We showed that reversible blockade of mPFC or BLA by lidocaine increased both locomotor and rearing responses to acute Amph, but blocked the expression of behavioural sensitization to Amph. These findings indicate that under free-lidocaine conditions repeated administration of Amph would produce a shift of mPFC and BLA motor function from an inhibitory to a facilitatory role in response to Amph. We propose that this phenomenon may be of major critical importance in the development of drug dependence.
authors.affiliation: UMR CI-NAPS 6232, Université de Caen, CNRS, CEA, Centre CYCERON, Caen, France.
authors.forename: Mickaël F
authors.initials: MF
authors.lastname: Degoulet
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Rostain
authors.forename: Hélène N
authors.initials: HN
authors.lastname: David
authors.forename: Jacques H
authors.initials: JH
authors.lastname: Abraini
mesh_terms: D000661:Amphetamine / Q000008:administration & dosage*; D019969:Amphetamine-Related Disorders / Q000209:etiology / Q000523:psychology; D000679:Amygdala / Q000187:drug effects*; D000704:Analysis of Variance; D000779:Anesthetics, Local / Q000008:administration & dosage; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D000697:Central Nervous System Stimulants / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D007263:Infusions, Parenteral; D007274:Injections, Intraperitoneal; D008012:Lidocaine / Q000008:administration & dosage; D008297:Male; D009043:Motor Activity / Q000187:drug effects*; D017397:Prefrontal Cortex / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000779:Anesthetics, Local; D000697:Central Nervous System Stimulants; D008012:Lidocaine; D000661:Amphetamine