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Cerebral hypoperfusion, induced by bilateral carotid artery stenosis (BCAS) in mice, did not disrupt diurnal rhythms. This study suggests reduced brain blood flow does not impact locomotor activity rhythms in wildtype mice.

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Area of Science:

  • Neuroscience
  • Circadian Biology
  • Vascular Biology

Background:

  • Cerebral hypoperfusion, or decreased blood flow to the brain, can alter circadian rhythms.
  • Changes in circadian rhythms are linked to an increased risk of Alzheimer's disease (AD).
  • Previous studies on circadian rhythms and cerebral hypoperfusion used rat models; this study investigates mice.

Purpose of the Study:

  • To investigate the effects of cerebral hypoperfusion on diurnal rhythms in a mice model.
  • To examine the impact of reduced blood flow on the corpus callosum, a white matter tract affected in AD.
  • To determine if bilateral carotid artery stenosis (BCAS) affects locomotor activity (LMA) rhythms.

Main Methods:

  • The bilateral carotid artery stenosis (BCAS) procedure was used to restrict blood flow in mice.
  • Locomotor activity (LMA) was recorded in a 12:12 light/dark cycle before and after BCAS surgery.
  • Corpus callosum white matter integrity was assessed using Kluver-Barrera staining and Luxol fast blue staining.

Main Results:

  • Locomotor activity (LMA) rhythms were maintained and unaffected by BCAS surgery in both BCAS and sham mice.
  • Cerebral hypoperfusion did not disrupt diurnal rhythms in wildtype mice.
  • Further analysis is planned to examine white matter changes in the corpus callosum.

Conclusions:

  • Cerebral hypoperfusion induced by BCAS does not appear to impact diurnal LMA rhythms in wildtype mice.
  • The study provides a foundation for future research into white matter changes in the corpus callosum following reduced cerebral blood flow.