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Reviews in the Neurosciences

Editor-in-Chief: Huston, Joseph P.

Editorial Board Member: Topic, Bianca / Adeli, Hojjat / Buzsaki, Gyorgy / Crawley, Jacqueline / Crow, Tim / Eichenbaum, Howard / Gold, Paul / Holsboer, Florian / Korth, Carsten / Lubec, Gert / McEwen, Bruce / Pan, Weihong / Pletnikov, Mikhail / Robbins, Trevor / Schnitzler, Alfons / Stevens, Charles / Steward, Oswald / Trojanowski, John

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increased IMPACT FACTOR 2013: 3.314
Rank 105 out of 251 in category Neurosciences in the 2013 Thomson Reuters Journal Citation Report/Science Edition

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Memory formation and memory alterations: 5-HT6 and 5-HT7 receptors, novel alternative

1Department of Pharmacobiology, CINVESTAV, Tenorios 235, Granjas Coapa, Mexico City 14330, Mexico

Corresponding author: Alfredo Meneses, Department of Pharmacobiology, CINVESTAV, Tenorios 235, Granjas Coapa, Mexico City 14330, Mexico, e-mail:

Citation Information: Reviews in the Neurosciences. Volume 25, Issue 3, Pages 325–356, ISSN (Online) 2191-0200, ISSN (Print) 0334-1763, DOI: 10.1515/revneuro-2014-0001, April 2014

Publication History

Received:
2013-12-03
Accepted:
2014-01-27
Published Online:
2014-04-03

Abstract

Agonists and antagonists of the 5-hydroxytryptamine (serotonin) receptor6 (5-HT6) or receptor7 (5-HT7) might improve memory and/or reverse amnesia, although the mechanisms involved are poorly understood. Hence, the current work summarizes recent reviews and findings involving these receptors. Evidence indicates that diverse 5-HT6 receptor antagonists produce promnesic and/or antiamnesic effect in conditions, such as memory formation, age-related cognitive impairments and memory deficit in preclinical studies, as well as in diseases such as schizophrenia, Parkinson’s, and Alzheimer’s disease (AD). Memory, aging, and AD modify 5-HT6 receptors and signaling cascades; likewise, the modulation of 5-HT6 drugs on memory seems to be accompanied with neural changes. Moreover, 5-HT7 receptors are localized in brain areas mediating memory, including the cortex, hippocampus (e.g., Zola-Morgan and Squire, 1993) and raphe nuclei; however, the role of these receptors on memory has yet to be fully explored. Hence, findings and reviews are summarized in this work. Evidence suggests that both 5-HT7 receptor agonists and antagonists might have promnesic and anti-amnesic effects. These effects seem to be dependent on the basal level of performance, i.e., normal or impaired. Available evidence suggests that a potential utility of 5-HT6 and 5-HT7 receptor in mild-to-moderate AD patients and other memory dysfunctions as therapeutic targets.

Keywords: drugs; memory; 5-HT receptors

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