The neurovascular unit, matrix proteases, and innate inflammation

Area of Science:

• Neuroscience
• Cerebrovascular Biology
• Pathology

Background:

• Microvessel-neuron interactions in the central nervous system are highly coordinated.
• Responses of microvasculature, neurons, and glia to focal ischemia suggest a unitary function.
• The neurovascular unit includes microvessels, astrocytes, neurons, and supporting cells.

Purpose of the Study:

• To explore the coordinated responses within the neurovascular unit during ischemic stroke.
• To investigate the role of inflammatory responses and matrix metalloproteinases (MMPs) in stroke.
• To identify cellular sources of MMP-9 and other proteases impacting neurovascular unit integrity.

Main Methods:

• Experimental models of focal ischemia in stroke.
• Analysis of matrix metalloproteinase (MMP)-9 levels in relation to ischemic injury.
• Investigation of cellular origins of MMP-9 and other matrix proteases.

Main Results:

• Focal ischemia triggers rapid, simultaneous responses in microvasculature, neurons, and glia.
• Matrix metalloproteinase (MMP)-9 is linked to hemorrhagic transformation after focal ischemia.
• Studies suggest specific cell types generate MMP-9, affecting neurovascular unit integrity.

Conclusions:

• The neurovascular unit functions as an integrated system during ischemic stroke.
• MMP-9 is a significant factor in stroke complications like hemorrhagic transformation.
• Understanding cellular sources of proteases is crucial for neurovascular unit protection.