Review: sporadic cerebral amyloid angiopathy

Area of Science:

• Neuropathology
• Vascular Biology
• Neurodegenerative Diseases

Background:

• Cerebral amyloid angiopathy (CAA) involves amyloid-β protein (Aβ) deposition in cerebral blood vessels.
• CAA is linked to intracerebral hemorrhages, microbleeds, and potentially vascular dementia.
• Impaired Aβ clearance across the blood-brain barrier contributes to CAA pathogenesis.

Purpose of the Study:

• To elucidate the role of Aβ deposition and clearance in cerebral amyloid angiopathy (CAA).
• To differentiate between pericapillary Aβ and capillary CAA in disease progression.
• To investigate CAA's contribution to cognitive decline and neurodegeneration.

Main Methods:

• Analysis of Aβ deposition in cerebral blood vessels (leptomeningeal, intracortical, capillary).
• Assessment of associated cerebrovascular lesions and white matter changes.
• Utilizing transgenic mouse models overexpressing Aβ precursor protein.

Main Results:

• CAA causes vascular lesions, including hemorrhages and microbleeds, contributing to cognitive impairment.
• Perivascular Aβ suggests impaired perivascular drainage, while capillary CAA indicates reduced transendothelial Aβ clearance.
• Severe CAA is an independent risk factor for cognitive decline.

Conclusions:

• CAA is a significant factor in the aging brain's multimorbidity.
• Aβ deposition and impaired clearance are central to CAA pathogenesis.
• Further research is needed to clarify CAA's precise role in neurodegeneration.