Potential Role of Venular Amyloid in Alzheimer's Disease Pathogenesis

Area of Science:

• Neuroscience
• Neuropathology
• Cerebrovascular Disease Research

Background:

• Alzheimer's disease (AD) is strongly associated with cerebral amyloid angiopathy (CAA), a condition involving amyloid-beta peptide (Aβ) accumulation in cerebral vessel walls.
• CAA impairs perivascular drainage and contributes to cerebrovascular dysfunction in AD.
• Existing research predominantly focuses on arterial Aβ, with less attention paid to Aβ accumulation in veins and venules.

Purpose of the Study:

• To review preclinical models and clinical studies investigating venular amyloid in the context of AD.
• To explore potential downstream pathological mechanisms linking venular amyloid to cerebrovascular dysfunction in AD.
• To enhance understanding of CAA's contribution to AD and its association with AD-related cerebrovascular diseases.

Main Methods:

• Review of existing preclinical models examining venular amyloid.
• Analysis of clinical studies investigating venular amyloid and associated pathologies.
• Synthesis of evidence on pathological mechanisms affecting the cerebrovasculature in AD due to venular amyloid.

Main Results:

• Preclinical and clinical evidence supports the presence of venular amyloid in AD.
• Venular amyloid exacerbates venous collagenosis, impairs cerebrovascular pulsatility, and enlarges perivascular spaces.
• These effects may lead to increased Aβ deposition via impaired perivascular clearance.

Conclusions:

• Understanding venular Aβ deposition mechanisms is crucial for comprehending CAA's role in AD and cerebrovascular disease.
• Venular amyloid contributes significantly to AD-related cerebrovascular pathology.
• Development of Aβ-targeted therapeutics focusing on vascular amyloid removal and cerebrovascular function is recommended.