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• W2323367752 abstract "Event Abstract Back to Event The role of AVT in the modulation of the circadian rhythmicity of EOD basal rate in South American weakly electric fish. Adriana Migliaro1, 2 and Ana Silva1, 2* 1 Facultad de Ciencias, Universidad de la República, Instituto de Biología, Uruguay 2 Instituto de Investigaciones Biológicas Clemente Estable, Uruguay Keeping an adequate timing among physiological and behavioral processes is a key point for survival. Endogenous biological rhythms are synchronized with external cues, mainly photoperiod, which vary in circadian and circa annual fashion. In South American weakly electric fish, the basal rate of the electric organ discharge (EOD-BR) shows a nocturnal rise in coincidence with arousal and with the increase of locomotor activity (Silva et al, 2005). EOD-BR is driven by the medullary pacemaker nucleus (PN), whose activity is not only modulated by the circadian system but also by environmental, sensory, and social cues (Kawasaki et al, 1988). By exerting an effect on a specific nucleus (PN), neuromodulators act on the organism’s arousal as well as on communication in different social contexts. ¿How is this neuromodulation system shaped in the CNS? Previous studies in teleosts show that melatonin, a key hormone in circadian regulation, is also a neuromodulator acting on areas linked to social activity (hypothalamic preoptic area) (Falcón et al, 2010). On the other hand, arginine-vasotocin (AVT), the hypothalamic neuropeptide known to modulate social behavior, has been recently related to EOD-BR increases in the gregarious species, Brachyhypopomus gauderio but not in the solitary one, Gymnotus omarorum (Perrone et al, 2010). In order to assess the contribution of AVT to the circadian rise in EOD-BR, the EOD of isolated non-sexually mature adults of both species was recorded continuously during 5 days at constant water temperature and conductivity (22°C, 150µS/cm), and with a light-dark cycle 12:12. At day 3, fish were either injected with AVT (1µg/g), AVT V1a receptor antagonist (Manning compound, 1µg/g) or saline. AVT treated fish showed a larger increase in the nocturnal rise of EOD-BR than saline controls in B. gauderio but not in G. omarorum. The administration of Manning compound in B. gauderio lowered the nocturnal rise of EOD-BR with respect to saline controls. Our data suggest that that the AVTergic system involved in the modulation of the circadian rhythm of EOD rate of B. gauderio but is not the only determinant of it. However, the picture is less clear for G. omarorum. Whether the AVTergic system is involved in the circadian regulation in just one or both species, and to which extent, is a key point for better understanding the evolution of neuromodulation systems. References -Falcón, J., Migaud, H., Muñoz-Cueto, J. A., Carrillo, M. Current knowledge on the melatonin system in teleost fish. General and Comparative Endocrinology, (2010). 165(3): 469-482 -Kawasaki M, Maler L, Rose GJ, Heiligenberg W. Anatomical and functional organization of the prepacemaker nucleus in gymnotiform electric fish: the accomodation of two behaviors in one nucleus. J Comp Neurol, (1988). 276: 113- 131. -Perrone, R., et al., Vasotocin actions on electric behavior: interspecific, seasonal, and social context-dependent differences. Frontiers in Behavioral Neuroscience, (2010). 5: p. 12. -Silva, A., L. Gomez, and R. Perrone. Circadian variations of electromotor and locomotor displays in the weakly electric fish, Brachyhypopomus pinnicaudatus. in VIII Latin American Symposium of Chronobiology. (2005). Cordoba, Argentina. Keywords: cicadian rhythms, Electric Fish, Neuromodulation Conference: Tenth International Congress of Neuroethology, College Park. Maryland USA, United States, 5 Aug - 10 Aug, 2012. Presentation Type: Poster (but consider for student poster award) Topic: Circadian Rhythms Citation: Migliaro A and Silva A (2012). The role of AVT in the modulation of the circadian rhythmicity of EOD basal rate in South American weakly electric fish.. Conference Abstract: Tenth International Congress of Neuroethology. doi: 10.3389/conf.fnbeh.2012.27.00072 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 13 Mar 2012; Published Online: 07 Jul 2012. * Correspondence: Dr. Ana Silva, Facultad de Ciencias, Universidad de la República, Instituto de Biología, Montevideo, Montevideo, 11400, Uruguay, asilva@iibce.edu.uy Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Adriana Migliaro Ana Silva Google Adriana Migliaro Ana Silva Google Scholar Adriana Migliaro Ana Silva PubMed Adriana Migliaro Ana Silva Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page." @default.
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• W2323367752 title "The role of AVT in the modulation of the circadian rhythmicity of EOD basal rate in South American weakly electric fish." @default.
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