Research brief
The blood-brain barrier (BBB) is vital for protecting the central nervous system and maintaining its homeostasis. Recent research highlights the WNT signalling pathway as a pivotal regulator of the BBB's development, maintenance, and repair. Disruptions in this pathway are linked to BBB dysfunction in various neurological disorders. Understanding the WNT pathway's role could lead to novel therapeutic strategies for restoring BBB integrity and improving drug delivery to the brain.
Key points
- WNT signalling regulates BBB development and repair.
- Disruption linked to neurological disorder-related BBB breakdown.
- Pharmacological activation shows promise in preclinical models.
WNT Pathway in BBB Development
The WNT signalling pathway, particularly through WNT7a/b ligands, is crucial for cerebral angiogenesis and the differentiation of the blood-brain barrier. This pathway involves β-catenin-dependent signalling, with key co-regulators like G protein-coupled receptor 124 (GPR124), Reversion-inducing cysteine-rich protein with Kazal motifs (RECK), and SRY-related HMG-box transcription factor 17 (Sox17). These components work together to form and mature the BBB.
Pathological Disruption in Neurological Disorders
In conditions such as ischaemic stroke, Alzheimer's disease, multiple sclerosis, and glioblastoma, the WNT signalling pathway often becomes disrupted, leading to the breakdown of the blood-brain barrier. This breakdown significantly impacts the progression of these diseases by compromising the protective environment of the central nervous system.
Therapeutic Potential of WNT Modulation
Pharmacological activation of WNT/β-catenin signalling, using agents like lithium and Glycogen synthase kinase 3β (GSK-3β) inhibitors, has shown promise in restoring BBB integrity in preclinical models. Additionally, modulating WNT signalling could improve drug delivery across the BBB, offering therapeutic benefits in treating brain tumours and neurodegenerative diseases. These findings suggest that targeted modulation of the WNT pathway could be a promising strategy for future clinical applications.
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