Dysfunctional Crosstalk in Ischemic Stroke: Exploring Network Failure and Emerging Communication Pathways

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Ischemic stroke causes widespread brain damage by disrupting complex intercellular communication networks within the neurovascular unit (NVU).
• Pathophysiological processes extend beyond neuronal damage, involving glial cells, immune cells, and the blood-brain barrier (BBB).
• The NVU comprises neurons, astrocytes, microglia, oligodendrocytes, endothelial cells, pericytes, and lymphocytes, all dynamically interacting during ischemic events.

Purpose of the Study:

• To review and analyze intercellular communication pathways regulating brain injury and repair after cerebral ischemia.
• To highlight current findings, debates, and research gaps in the signaling networks among NVU components.
• To explore emerging communication mechanisms and their role in ischemic pathophysiology.

Main Methods:

• Comprehensive analysis of intricate signaling networks among neurons, astrocytes, microglia, oligodendrocytes, endothelial cells, pericytes, and lymphocytes.
• Investigation of glial cell activation states, BBB disruption mechanisms (including glycocalyx degradation), and immunoregulatory roles of lymphocyte subsets (Tregs, Bregs, γδ T cells).
• Assessment of classical signaling, extracellular vesicles (EVs), tunneling nanotubes (TNTs), and migrasomes in ischemic pathophysiology.

Main Results:

• Glial responses exhibit dual activation states influencing stroke outcomes.
• Blood-brain barrier integrity is compromised through mechanisms like glycocalyx degradation.
• Lymphocyte subsets play complex immunoregulatory roles, and novel communication methods like EVs and TNTs are implicated in ischemic injury.

Conclusions:

• Ischemic stroke represents a progressive failure of intercellular communication, offering a systems-based approach to treatment.
• Understanding the complex crosstalk within the NVU is crucial for developing targeted therapies.
• Future research should focus on resolving mechanistic uncertainties and exploring network modulation for enhanced neurological recovery.