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The primate seahorse rhythm.

L M G Campos1, Roelf J Cruz-Rizzolo2, L Pinato1

  • 1Department of Speech-Language and Hearing Therapy, São Paulo State University, Marilia, SP, Brazil.

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Summary

The day-night cycle influences the primate hippocampus, affecting memory and behavior. This study found circadian rhythms in PER2 and calcium-binding proteins, suggesting independent hippocampal rhythmicity crucial for adaptation.

Keywords:
Calcium binding proteinsCircadian cycleHippocampusLearning and memoryPER2

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Primate Research

Background:

  • The circadian system, driven by the day-night cycle, regulates crucial behaviors like sleep, body temperature, and memory.
  • Hippocampal functions, including memory acquisition, consolidation, and retrieval, are modulated by circadian rhythms and light-dark cycles.

Purpose of the Study:

  • To investigate the cellular mechanisms within the hippocampus of a diurnal primate (Sapajus apella) that are influenced by daily light and dark cycles.
  • To analyze the expression patterns of the PER2 protein and calcium-binding proteins (CaBPs) in the hippocampus during diurnal and nocturnal phases.

Main Methods:

  • Analysis of PER2 protein expression in the hippocampus of Sapajus apella at distinct day and night time points.
  • Assessment of immunoreactivity for calcium-binding proteins (calbindin, calretinin, parvalbumin) in hippocampal cells, examining cell number and morphology during day and night phases.

Main Results:

  • PER2 protein expression peaked during the night, exhibiting an antiphase relationship with the suprachiasmatic nucleus (SCN) and indicating independent hippocampal rhythmicity.
  • Hippocampal rhythms in PER2 expression mirrored those in diurnal rodents, differing from nocturnal rodents.
  • Day/night variations were observed in the number and morphology of cells expressing CaBPs.

Conclusions:

  • Circadian regulation in the primate hippocampus involves rhythmic expression of PER2 and CaBPs.
  • These hippocampal rhythms likely contribute to the adaptation of diurnal primates to daily environmental changes and activities.
  • The findings suggest that hippocampal cells possess their own rhythmicity, independent of the SCN in some aspects.