title: Dissociable contribution of 5-HT1A and 5-HT2A receptors in the medial prefrontal cortex to different aspects of executive control such as impulsivity and compulsive perseveration in rats.
abstract: Serotonin (5-HT) receptors are increasingly recognized as major targets for cognitive enhancement in schizophrenia. Several lines of evidence suggest a pathophysiological role for glutamate NMDA receptors in the prefrontal cortex in schizophrenia and associated disorders in attention and executive functioning. We investigated how the interactions between 5-HT1A and 5-HT2A and glutamate NMDA receptor mechanisms in the medial prefrontal cortex (mPFC) contribute to the control of different aspects of attentional performance. Rats were trained on a five-choice serial reaction time (5-CSRT) task, which provides indices of attentional functioning (percentage of correct responses), executive control (measured by anticipatory and perseverative responses), and speed. The competitive NMDA receptor antagonist CPP (50 ng/side) was infused directly into the mPFC 5 min after infusion of either 8-OH-DPAT (30 and 100 ng/side) or M100907 (100 and 300 ng/side) into the same brain area. Impairments in attentional functioning induced by CPP were completely abolished by both doses of 8-OH-DPAT or M100907. In addition, M100907 abolished the CPP-induced anticipatory responding but had no effects on perseverative over-responding, while 8-OH-DPAT reduced the perseverative over-responding but had no effects on anticipatory responding induced by CPP. The selective 5-HT(1A) receptor antagonist WAY100635 (30 ng/side) antagonized the effects of 8-OH-DPAT (100 ng/side). 8-OH-DPAT at 30 ng/side reduced the latency of correct responses in controls and CPP-injected rats and lowered the percentage of omissions in CPP-injected rats. The data show that 5-HT1A and 5-HT2A receptors in the mPFC exert opposing actions on attentional functioning and demonstrate a dissociable contribution of 5-HT1A and 5-HT2A receptors in the mPFC to different aspects of executive control such as impulsivity and compulsive perseveration.
authors.affiliation: Department of Neuroscience, Istituto di Ricerche Farmacologiche Mario Negri, Milano, Italy. mirjana@marionegri.it
authors.forename: Mirjana
authors.initials: M
authors.lastname: Carli
authors.forename: Marta
authors.initials: M
authors.lastname: Baviera
authors.forename: Roberto W
authors.initials: RW
authors.lastname: Invernizzi
authors.forename: Claudia
authors.initials: C
authors.lastname: Balducci
mesh_terms: D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology; D000704:Analysis of Variance; D000818:Animals; D001288:Attention / Q000187:drug effects / Q000502:physiology*; D001522:Behavior, Animal; D002755:Choice Behavior / Q000187:drug effects / Q000502:physiology; D003192:Compulsive Behavior / Q000503:physiopathology*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D005464:Fluorobenzenes / Q000494:pharmacology; D007175:Impulsive Behavior / Q000503:physiopathology*; D008297:Male; D010879:Piperazines / Q000494:pharmacology; D010880:Piperidines / Q000494:pharmacology; D017397:Prefrontal Cortex / Q000187:drug effects / Q000502:physiology*; D011725:Pyridines / Q000494:pharmacology; D051381:Rats; D011930:Reaction Time / Q000187:drug effects; D044282:Receptor, Serotonin, 5-HT1A / Q000502:physiology*; D044402:Receptor, Serotonin, 5-HT2A / Q000502:physiology*; D016194:Receptors, N-Methyl-D-Aspartate / Q000502:physiology; D012702:Serotonin Antagonists / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology
chemical_list: D018691:Excitatory Amino Acid Antagonists; D005464:Fluorobenzenes; D010879:Piperazines; D010880:Piperidines; D011725:Pyridines; D044402:Receptor, Serotonin, 5-HT2A; D016194:Receptors, N-Methyl-D-Aspartate; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; D044282:Receptor, Serotonin, 5-HT1A; C090413:N-(2-(4-(2-methoxyphenyl)-1-piperazinyl)ethyl)-N-(2-pyridinyl)cyclohexanecarboxamide; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; C050592:3-(2-carboxypiperazin-4-yl)propyl-1-phosphonic acid; C079049:volinanserin