Extracellular proteolytic pathophysiology in the neurovascular unit after stroke

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• The neurovascular unit, comprising endothelium, astrocytes, and neurons, is crucial for brain response to stroke.
• A shift towards an integrative approach considering all brain cells and matrix responses is recommended.
• Extracellular proteolytic systems play a key role in stroke pathophysiology.

Purpose of the Study:

• To review recent data on extracellular proteolytic dysfunction within the neurovascular unit after stroke.
• To explore the role of proteolysis in blood-brain barrier disruption and inflammatory responses.
• To investigate the implications of proteolytic imbalance for thrombolytic stroke therapy.

Main Methods:

• Review of recent scientific literature on extracellular proteolysis in stroke.
• Analysis of cell-cell and cell-matrix signaling pathways in the neurovascular unit.
• Examination of the role of plasminogen and matrix metalloprotease families in stroke.

Main Results:

• Extracellular proteolytic dysfunction contributes to blood-brain barrier breakdown, edema, and hemorrhage.
• Endothelial dysfunction exacerbates inflammatory responses post-stroke.
• Perturbations in cell-matrix homeostasis activate multiple cell death pathways.
• Interactions between plasminogen and matrix metalloproteases may cause hemorrhagic complications during thrombolytic therapy.

Conclusions:

• Targeting proteolytic imbalance in the neurovascular unit offers potential therapeutic strategies.
• Modulating extracellular proteolysis could enhance the safety and efficacy of thrombolytic reperfusion therapy for stroke.
• An integrative view of the neurovascular unit is essential for understanding stroke and developing treatments.