Tight junctions in brain barriers during central nervous system inflammation

Area of Science:

• Neuroscience
• Cell Biology
• Immunology

Background:

• Central nervous system (CNS) homeostasis is crucial for neuronal function.
• The blood-brain barrier (BBB) and blood-cerebrospinal fluid (CSF) barrier (BCSFB) maintain CNS integrity.
• Tight junctions (TJs) between cells form these physical barriers.

Purpose of the Study:

• To review the cellular and molecular aspects of TJ complexes at the BBB and BCSFB.
• To emphasize the role of CNS inflammation and reactive oxygen species in TJ dysfunction.
• To understand how barrier dysfunction contributes to neurological disorders.

Main Methods:

• Literature review of studies on CNS barriers and inflammation.
• Analysis of TJ protein composition, function, and dynamics.
• Focus on the impact of pro-inflammatory cytokines, matrix metalloproteases, and reactive oxygen species.

Main Results:

• CNS inflammatory disorders alter BBB and BCSFB integrity.
• Pro-inflammatory factors and reactive oxygen species disrupt TJ complexes.
• Barrier dysfunction contributes to neurological disorders through leakage and inflammatory cell migration.

Conclusions:

• Dysfunctional TJs at the BBB and BCSFB are implicated in CNS inflammatory disorders.
• Understanding TJ alterations is key to addressing neurological diseases.
• Reactive oxygen species play a significant role in barrier disruption.