[REACTION OF STRUCTURAL ELEMENTS OF HEMATOENCEPHALIC BARRIER IN NEWBORN RATS TO NORMOBARIC HYPOXIA]

Area of Science:

• Neuroscience
• Developmental Biology
• Physiology

Background:

• The early newborn period is critical for adaptation and heightened sensitivity to environmental stressors.
• Homeostasis and barrier mechanisms are crucial during this vulnerable stage.
• Perinatal hypoxia poses a significant risk to neonatal development.

Purpose of the Study:

• To investigate the impact of perinatal normobaric hypoxia on the hematoencephalic barrier (HEB).
• To examine structural changes in neocortex capillaries following hypoxic exposure.
• To understand the effects on HEB differentiation and integrity.

Main Methods:

• Utilized light and electron microscopy to analyze neocortex capillary structure.
• Modeled perinatal hypoxia as a condition mimicking incomplete human pregnancy.
• Assessed alterations in capillary wall elements, including the basal membrane.

Main Results:

• Hypoxia induced structural alterations in all neocortex capillary wall elements.
• Observed impairment of microcirculation and increased HEB permeability.
• Hypoxia delayed basal membrane differentiation and caused vesicular degeneration of the basal membrane, impacting laminae rara et densa formation.

Conclusions:

• Perinatal hypoxia significantly damages the developing hematoencephalic barrier.
• Structural alterations in capillaries compromise microcirculation and barrier function.
• Disruption of basal membrane formation and integrity is a key consequence of hypoxic insult.