Tauopathies - Focus on Changes at the Neurovascular Unit.

Area of Science:

• Neuroscience
• Pathology
• Vascular Biology

Background:

• The blood-brain barrier (BBB) is traditionally viewed as a physical barrier but is now understood as a dynamic component of the neurovascular unit (NVU).
• Dysfunction of the BBB is implicated in numerous central nervous system (CNS) pathologies, including Alzheimer's disease, Parkinson's disease, and stroke.
• Tauopathies, a group of neurodegenerative diseases, involve abnormal tau protein deposition, with limited understanding of their connection to BBB impairment.

Purpose of the Study:

• To review the current understanding of tauopathies.
• To examine the role and function of the blood-brain barrier (BBB) and the neurovascular unit (NVU).
• To explore the potential connection between BBB dysfunction and tau protein misfolding in neurodegenerative diseases.

Main Methods:

• Literature review of studies on tauopathies, BBB function, and NVU components.
• Synthesis of existing research linking neurovascular dysfunction to neurodegenerative processes.
• Analysis of the implications of BBB opening and serum infiltration in CNS pathologies.

Main Results:

• BBB dysfunction is a common factor in a growing list of CNS diseases, leading to neuronal damage.
• While amyloid-beta deposition is linked to BBB permeability, the relationship between tau pathology and BBB impairment is less understood.
• The NVU model provides a framework for understanding the complex interactions between vascular, glial, and neuronal cells in disease.

Conclusions:

• The BBB and NVU are critical in maintaining CNS health and are increasingly recognized as central players in neurodegeneration.
• Further research is needed to elucidate the specific mechanisms linking tauopathies to BBB dysfunction.
• Understanding these connections is crucial for developing effective therapeutic strategies for neurodegenerative diseases.