The primate seahorse rhythm

Autor(es)

Campos, L. M. G. ^[1] ; Cruz-Rizzolo, Roelf J. ^[2] ; Pinato, L. ^[1]

Afiliação do(s) autor(es)

^[1] Selo Paulo State Univ, Dept Speech Language & Hearing Therapy, Marilia, SP - Brazil

^[2] Selo Paulo State Univ, Dept Basic Sci, Aracatuba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brain Research; v. 1613, p. 81-91, JUL 10 2015.
• Citações Web of Science: 2

Resumo

The main Zeitgeber, the day-night cycle, synchronizes the central oscillator which determines behaviors rhythms as sleep-wake behavior, body temperature, the regulation of hormone secretion, and the acquisition and processing of memory. Thus, actions such as acquisition, consolidation, and retrieval performed in the hippocampus are modulated by the circadian system and show a varied dependence on light and dark. To investigate changes in the hippocampus' cellular mechanism invoked by the day and night in a diurnal primate, this study analyzed the expression of PER2 and the calcium binding proteins (CaBPs) calbindin, calretinin and parvalbumin in the hippocampus of Sapajus apella, a diurnal primate, at two different time points, one during the day and one during the dark phase. The PER2 protein expression peaked at night in the antiphase described for the suprachiasmatic nucleus (SCN) of the same primate, indicating that hippocampal cells can present independent rhythmicity. This hippocampal rhythm was similar to that presented by diurnal but not nocturnal rodents. The CaBPs immunoreactivity also showed day/night variations in the cell number and in the cell morphology. Our findings provide evidence for the claim that the circadian regulation in the hippocampus may involve rhythms of PER2 and CaBPs expression that may contribute to the adaptation of this species in events and activities relevant to the respective periods. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/51495-4 - Produção de melatonina por células do sistema nervoso central em condições de injúria
• Beneficiário: Luciana Pinato
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores