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Abstract:

Memory reconsolidation is a dynamic process in which a previously consolidated memory becomes labile following reactivation by a reminder. In a previous study in the crab Chasmagnathus memory model, we showed that a water-shortage episode, via angiotensin modulation during reconsolidation, could reveal a memory that otherwise remains unexpressed: weakly trained animals cannot reveal long-term memory (LTM) except when an episode of noticeable ethological meaning, water deprivation, is contingent upon reconsolidation. However, these results are at variance with two of our previous interpretations: weak training protocols do not build LTM and angiotensin II modulates the strength of the information storing process. A parsimonious hypothesis is that in Chasmagnathus angiotensins regulate LTM expression, but not LTM storage. Here, we tested three predictions of this hypothesis. First, the well-known retrograde amnesic effect of the angiotensin II antagonist saralasin is not due to interference on memory storage, but to modulation of memory expression. Second, the recovery of the LTM memory expression of the apparently amnesic retrograde effect produced by saralasin, through the water-shortage episode contingent upon reconsolidation, must be reconsolidation specific. Consequently, summation-like effects and retrieval deficits cannot explain these results because of the parametric conditions of reconsolidation. Third, weak training protocols build an unexpressed LTM that requires mRNA transcription and translation, a diagnostic characteristic of LTM. Results show that angiotensin modulates LTM expression but not LTM memory storage in the crab Chasmagnathus. The results lead us to suggest that, in Chasmagnathus, LTM expression - the process of gaining appreciable control over behavior of the reactivated trace in the retrieval session - may be considered a distinct attribute of its long-term storage. This strategy, a positive modulation during reconsolidation, is proposed to distinguish between memories that can be reactivated, labilized and are not expressed, and memories that are not stored long term, obliterated or altered in other retrieval mechanisms. © 2010 Elsevier Inc.

Registro:

Documento: Artículo
Título:Angiotensin modulates long-term memory expression but not long-term memory storage in the crab Chasmagnathus
Autor:Frenkel, L.; Suárez, L.D.; Maldonado, H.; Delorenzi, A.
Filiación:Laboratorio de Neurobiología de la Memoria, Departamento de Fisiología y Biología Molecular, IFIByNE-CONICET, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria (C1428EHA), Pabellón II, Argentina
Palabras clave:Angiotensin; Chasmagnathus; Consolidation; Expression; Memory; Modulatory system; Reconsolidation; angiotensin II; messenger RNA; saralasin; adult animal; animal behavior; animal experiment; article; associative memory; controlled study; crab; long term memory; male; memory consolidation; nonhuman; RNA transcription; RNA translation; water deprivation; Angiotensin II; Angiotensin II Type 1 Receptor Blockers; Animals; Association Learning; Brachyura; Environment; Male; Memory, Long-Term; Mental Recall; Recognition (Psychology); Saralasin; Water Deprivation
Año:2010
Volumen:94
Número:4
Página de inicio:509
Página de fin:520
DOI: http://dx.doi.org/10.1016/j.nlm.2010.09.003
Título revista:Neurobiology of Learning and Memory
Título revista abreviado:Neurobiol. Learn. Mem.
ISSN:10747427
CODEN:NLMEF
CAS:angiotensin II, 11128-99-7; saralasin, 34273-10-4; Angiotensin II, 11128-99-7; Angiotensin II Type 1 Receptor Blockers; Saralasin, 34273-10-4
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10747427_v94_n4_p509_Frenkel

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Citas:

---------- APA ----------
Frenkel, L., Suárez, L.D., Maldonado, H. & Delorenzi, A. (2010) . Angiotensin modulates long-term memory expression but not long-term memory storage in the crab Chasmagnathus. Neurobiology of Learning and Memory, 94(4), 509-520.
http://dx.doi.org/10.1016/j.nlm.2010.09.003
---------- CHICAGO ----------
Frenkel, L., Suárez, L.D., Maldonado, H., Delorenzi, A. "Angiotensin modulates long-term memory expression but not long-term memory storage in the crab Chasmagnathus" . Neurobiology of Learning and Memory 94, no. 4 (2010) : 509-520.
http://dx.doi.org/10.1016/j.nlm.2010.09.003
---------- MLA ----------
Frenkel, L., Suárez, L.D., Maldonado, H., Delorenzi, A. "Angiotensin modulates long-term memory expression but not long-term memory storage in the crab Chasmagnathus" . Neurobiology of Learning and Memory, vol. 94, no. 4, 2010, pp. 509-520.
http://dx.doi.org/10.1016/j.nlm.2010.09.003
---------- VANCOUVER ----------
Frenkel, L., Suárez, L.D., Maldonado, H., Delorenzi, A. Angiotensin modulates long-term memory expression but not long-term memory storage in the crab Chasmagnathus. Neurobiol. Learn. Mem. 2010;94(4):509-520.
http://dx.doi.org/10.1016/j.nlm.2010.09.003