title: Long-term memory consolidation depends on proteasome activity in the crab Chasmagnathus.
abstract: Long-term memory formation depends on protein and mRNA synthesis that subserves synaptic reorganization. The removal of pre-existing inhibitory proteins by the ubiquitin-proteasome system (UPS) is proposed as a crucial step to support these modifications. The activation of the constitutive transcription factor nuclear factor kappaB (NF-kappaB) depends on the degradation of the inhibitor of NF-kappaB (IkappaB) by the UPS. Here we study the effect of a UPS inhibitor, MG132, on long-term memory consolidation and NF-kappaB activation in the learning paradigm of the crab Chasmagnathus, a model in which this transcription factor plays a key role. Here we found that administration of MG132 interferes with long-term memory but not with short-term memory, and no facilitatory effects were found. Then we studied the effect of the UPS inhibitor on NF-kappaB pathway, finding that MG132 blocks the activation of NF-kappaB induced by training. These results suggest that the UPS is necessary for long-term memory consolidation, allowing for the activation of NF-kappaB as one of the target molecular pathways.
authors.affiliation: Laboratorio de Neurobiología de la Memoria, Departamento de Fisiología, Biología Molecular y Celular,Universidad de Buenos Aires, IFIByNE, CONICET, Ciudad Universitaria, PAb. II, 2do piso (1428EHA), Buenos Aires, Argentina.
authors.forename: E
authors.initials: E
authors.lastname: Merlo
authors.forename: A
authors.initials: A
authors.lastname: Romano
mesh_terms: D000818:Animals; D003386:Brachyura / Q000201:enzymology*; D003214:Conditioning, Classical / Q000187:drug effects / Q000502:physiology*; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D007976:Leupeptins / Q000494:pharmacology; D008297:Male; D008568:Memory / Q000187:drug effects / Q000502:physiology*; D009043:Motor Activity; D016328:NF-kappa B / Q000378:metabolism*; D009473:Neuronal Plasticity / Q000187:drug effects / Q000502:physiology; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism*; D061988:Proteasome Inhibitors; D013997:Time Factors; D025801:Ubiquitin / Q000187:drug effects / Q000378:metabolism
chemical_list: D015853:Cysteine Proteinase Inhibitors; D007976:Leupeptins; D016328:NF-kappa B; D061988:Proteasome Inhibitors; D025801:Ubiquitin; D046988:Proteasome Endopeptidase Complex; C072553:benzyloxycarbonylleucyl-leucyl-leucine aldehyde