The myth of the immature barrier systems in the developing brain: role in perinatal brain injury

Area of Science:

• Neuroscience
• Developmental Biology
• Immunology

Background:

• Cellular barriers maintain central nervous system (CNS) homeostasis.
• Historically, developmental CNS barriers were considered functionally immature.
• These barriers protect the brain from blood-borne molecules and pathogens.

Purpose of the Study:

• To review advances in understanding CNS barrier development.
• To present evidence for the neurodevelopmental functions of these barriers.
• To discuss factors that compromise barrier integrity in the developing brain.

Main Methods:

• Literature review of developmental neuroscience and immunology.
• Synthesis of evidence on barrier function during fetal and neonatal periods.
• Analysis of mechanisms underlying barrier disruption.

Main Results:

• CNS barriers are functionally mature and essential during development.
• Fetal and newborn brains are significantly protected by these barriers.
• Ischemic injury and systemic inflammation can breach barrier integrity.

Conclusions:

• Developing CNS barriers play critical neurodevelopmental roles.
• The fetal and neonatal brain possesses robust protective mechanisms.
• Understanding barrier dynamics is key to addressing developmental neurological insults.