title: Intra-amygdala injections of CREB antisense impair inhibitory avoidance memory: role of norepinephrine and acetylcholine.
abstract: Infusions of CREB antisense into the amygdala prior to training impair memory for aversive tasks, suggesting that the antisense may interfere with CRE-mediated gene transcription and protein synthesis important for the formation of new memories within the amygdala. However, the amygdala also appears to modulate memory formation in distributed brain sites, through mechanisms that include the release of norepinephrine and acetylcholine within the amygdala. Thus, CREB antisense injections may affect memory by interfering with mechanisms of modulation, rather than storage, of memory. In the present experiment, rats received bilateral intra-amygdala infusions of CREB antisense (2 nmol/1 microL) 6 h prior to inhibitory avoidance training. In vivo microdialysis samples were collected from the right amygdala before, during, and following training. CREB antisense produced amnesia tested at 48 h after training. In addition, CREB antisense infusions dampened the training-related release of norepinephrine, and to a lesser extent of acetylcholine, in the amygdala. Furthermore, intra-amygdala infusions of the beta-adrenergic receptor agonist clenbuterol administered immediately after training attenuated memory impairments induced by intra-amygdala injections of CREB antisense. These findings suggest that intra-amygdala treatment with CREB antisense may affect processes involved in modulation of memory in part through interference with norepinephrine and acetylcholine neurotransmission in the amygdala.
authors.affiliation: Neuroscience Program, University of Illinois, Urbana-Champaign, Illinois 61820, USA.
authors.forename: Clinton E
authors.initials: CE
authors.lastname: Canal
authors.forename: Qing
authors.initials: Q
authors.lastname: Chang
authors.forename: Paul E
authors.initials: PE
authors.lastname: Gold
mesh_terms: D000109:Acetylcholine / Q000378:metabolism*; D000318:Adrenergic beta-Agonists; D000679:Amygdala / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D016375:Antisense Elements (Genetics) / Q000008:administration & dosage*; D001362:Avoidance Learning / Q000502:physiology; D002976:Clenbuterol; D017362:Cyclic AMP Response Element-Binding Protein / Q000037:antagonists & inhibitors*; D007150:Immunohistochemistry; D007276:Injections, Intraventricular; D008297:Male; D008568:Memory / Q000187:drug effects / Q000502:physiology*; D017551:Microdialysis; D009638:Norepinephrine / Q000378:metabolism*; D016760:Proto-Oncogene Proteins c-fos / Q000096:biosynthesis; D051381:Rats; D017207:Rats, Sprague-Dawley; D009435:Synaptic Transmission
chemical_list: D000318:Adrenergic beta-Agonists; D016375:Antisense Elements (Genetics); D017362:Cyclic AMP Response Element-Binding Protein; D016760:Proto-Oncogene Proteins c-fos; D000109:Acetylcholine; D009638:Norepinephrine; D002976:Clenbuterol
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