The blood-brain and the blood-cerebrospinal fluid barriers: function and dysfunction

Area of Science:

• Neuroscience
• Cell Biology
• Immunology

Background:

• The central nervous system (CNS) is protected by the blood-brain barrier (BBB) and blood-cerebrospinal fluid barrier (BCSFB).
• The BBB, formed by endothelial cells, and the BCSFB, formed by choroid plexus epithelial cells, prevent harmful substances from entering the CNS.
• These barriers utilize tight junctions and specific transport mechanisms to maintain a stable neural environment.

Purpose of the Study:

• To review the cellular and molecular mechanisms underlying the function and dysfunction of blood-CNS barriers.
• To focus on the role of these barriers in CNS autoimmune inflammation.

Main Methods:

• Review of current scientific literature on blood-CNS barrier structure and function.
• Analysis of cellular and molecular components of the BBB and BCSFB.
• Examination of barrier alterations in the context of CNS pathology and inflammation.

Main Results:

• The BBB's integrity relies on specialized endothelial cells, tight junctions, and interactions with surrounding cells like pericytes and astrocytes.
• The BCSFB, in addition to barrier functions, is involved in cerebrospinal fluid production via choroid plexus epithelial cells.
• Pathological conditions in the CNS can compromise these barriers, leading to edema and inflammatory cell infiltration.

Conclusions:

• Understanding the cellular and molecular basis of blood-CNS barriers is crucial for comprehending CNS health and disease.
• Alterations in barrier function are key events in CNS autoimmune inflammatory diseases.
• Further research into these barriers may reveal therapeutic targets for neurological disorders.