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Sex Differences in Mouse Hippocampal Astrocytes after In-Vitro Ischemia
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Early hypoxia-ischemia causes hemisphere and sex-dependent cognitive impairment and histological damage

E F Sanches1, N S Arteni, F Nicola

  • 1Post-Graduation Program of Neuroscience, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Brazil. ef.sanches@yahoo.com

Neuroscience
|February 12, 2013
PubMed

Insights

Neonatal hypoxia-ischemia (HI) in rats at postnatal day 3 caused brain damage and cognitive issues. Female rats with left-sided injury showed greater vulnerability, indicating sex and brain lateralization impact outcomes.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neurology

Background:

  • Neonatal cerebral hypoxia-ischemia (HI) is a leading cause of neurological disorders.
  • In preterm infants, HI primarily affects white matter, leading to long-term cognitive deficits.
  • Rodent models, like hypoxia-ischemia at postnatal day 3 (HIP3), mimic preterm brain injury and its consequences.

Purpose of the Study:

  • To investigate the influence of brain lateralization and sexual dimorphism on behavioral and histological outcomes after HIP3.
  • To assess long-term sensory, motor, and cognitive impairments in adult rats subjected to HIP3.

Main Methods:

  • Wistar rats underwent unilateral carotid artery occlusion and systemic hypoxia (HIP3) or sham surgery.
  • Behavioral tests (elevated plus maze, cylinder test, Morris water maze) assessed sensory and cognitive functions.
  • Histological analysis evaluated hemisphere/hippocampus volumes and white matter damage (corpus callosum area).

Main Results:

  • HIP3 rats did not exhibit motor impairments, but right-sided injury induced anxiety-like behaviors.
  • Female rats with left-sided HIP3 injury displayed significant spatial memory deficits.
  • Left-sided HIP3 injury in females correlated with more extensive histological damage compared to other groups.

Conclusions:

  • Sex and the lateralization of brain injury significantly modulate the effects of early-life hypoxia-ischemia.
  • Female rats are more susceptible to HIP3-induced neurodevelopmental and cognitive impairments when the left hemisphere is affected.
  • Findings highlight the importance of considering sex and injury location in understanding and treating neonatal brain injury.

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