Brain research

Daily activity patterns of two brain peptides in the internal clock of a day-active squirrel

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Updated

Abstract

The circadian period (τ) of the South Indian Palm Squirrel is approximately 24.19 hours under light/dark conditions.

  • The South Indian Palm Squirrel exhibits a diurnal pattern of locomotor activity across various light conditions.
  • Anatomical analysis shows the squirrel's suprachiasmatic nucleus (SCN) has a higher neuronal population compared to nocturnal rodents.
  • Distribution of neuropeptides vasoactive intestinal polypeptide (VIP) and arginine vasopressin (AVP) in the SCN reveals daily rhythmicity.
  • VIP levels peak at ZT-6 and AVP levels at ZT-12, indicating a staggered peak time of 6 hours between these neuropeptides.
  • The observed differences in VIP and AVP rhythms in squirrels compared to rats may inform the regulation of diurnal behaviors.

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