Blood-Brain Barrier Dynamics in Ischemic Stroke

The blood–brain barrier (BBB) is a specialised vascular interface that regulates molecular and cellular exchange between the circulation and the central nervous system. In ischaemic stroke, arterial occlusion initiates a cascade of events that compromise barrier integrity through both paracellular and transcellular routes. Early hypoxic injury to endothelial cells leads to cytoskeletal rearrangement and increased vesicular trafficking, precipitating cytotoxic and vasogenic oedema. A subsequent inflammatory surge—mediated by cytokines, matrix metalloproteinases and activated glial cells—exacerbates tight junction disruption and heightens the risk of haemorrhagic transformation during reperfusion. In the subacute phase, neoangiogenesis restores perfusion but often produces immature, leaky microvessels, while longer-term remodelling gradually re-establishes barrier selectivity, albeit with persistent low-grade permeability. Elucidating these multiphasic alterations is critical for devising interventions that stabilise the BBB, limit secondary injury and optimise delivery of neuroprotective agents. Given the global burden of stroke-related mortality and disability, strategies that preserve or restore BBB function hold promise for reducing haemorrhagic complications and improving functional recovery on a population scale.

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Blood-Brain Barrier Dynamics in Ischemic Stroke publication trend

The graph below shows the total number of articles in blood-brain barrier dynamics in ischemic stroke across all publications each year (not limited to Nature Index journals).

Technical terms

Blood–Brain Barrier (BBB): A selective endothelial interface that restricts passage of blood-borne substances into the brain.

Tight Junction Proteins (TJPs): Transmembrane and scaffolding proteins (for example ZO-1, Claudin-5) that seal interendothelial clefts.

Extracellular Vesicles (EVs): Membrane-bound particles released by cells that carry proteins, lipids and nucleic acids to modulate recipient cell function.

Caveolin-1 (Cav-1): A scaffolding protein involved in caveolae formation that regulates endocytotic trafficking at the endothelial surface.

Astrocytes: Star-shaped glial cells that support neuronal function and contribute to BBB maintenance through end-foot processes.

A1 Astrocyte Phenotype: A reactive, neurotoxic astrocyte state induced by inflammatory stimuli that exacerbates barrier breakdown.

Haemorrhagic Transformation (HT): The conversion of an ischaemic infarct into a haemorrhagic lesion, often linked to excessive BBB permeability.

Endothelial Mechanotransduction: The process by which endothelial cells convert mechanical forces into biochemical signals influencing barrier integrity.

References

1. Comparative study of extracellular vesicles derived from mesenchymal stem cells and brain endothelial cells attenuating blood–brain barrier permeability via regulating Caveolin-1-dependent ZO-1 and Claudin-5 endocytosis in acute ischemic stroke. Journal of Nanobiotechnology (2023).
2. Blocking C3d+/GFAP+ A1 Astrocyte Conversion with Semaglutide Attenuates Blood-Brain Barrier Disruption in Mice after Ischemic Stroke. Aging and Disease (2022).
3. Pathophysiology of Blood–Brain Barrier Permeability Throughout the Different Stages of Ischemic Stroke and Its Implication on Hemorrhagic Transformation and Recovery. Frontiers in Neurology (2020).