Structure and Function of the Blood-Brain Barrier (BBB)

Area of Science:

• Neuroscience
• Cell Biology
• Physiology

Background:

• The blood-brain barrier (BBB) is a critical interface protecting the central nervous system (CNS) from harmful substances.
• It is formed by endothelial cells, pericytes, astrocytes, neurons, and microglia, collectively known as the neurovascular unit (NVU).
• The Wnt/β-catenin pathway is essential for inducing and maintaining BBB endothelial barrier function.

Purpose of the Study:

• To provide an overview of current knowledge on BBB and NVU structure and function.
• To highlight research on cellular and molecular interactions within the NVU.
• To identify potential therapeutic targets for modulating BBB function in health and disease.

Main Methods:

• Review of state-of-the-art knowledge on BBB and NVU.
• Discussion of current research topics and recent advances.
• Exploration of CNS physiology and pathophysiology related to BBB and NVU.

Main Results:

• The BBB and NVU possess specialized molecular features for barrier integrity, transport, and immune responses.
• Recent advances include understanding the heterogeneity of BBB and NVU within the CNS.
• The BBB and NVU contribute to CNS physiology (e.g., neurovascular coupling) and pathophysiology.

Conclusions:

• A deeper understanding of cellular and molecular interactions at the NVU is crucial.
• Investigating BBB and NVU heterogeneity is key to understanding CNS function and disease.
• New avenues for therapeutic BBB modulation are emerging from current research.