Neurovascular dysfunction and vascular amyloid accumulation as early events in Alzheimer's disease.
Level 5 - mechanism / opinion, no new human data
Narrative review discussing pathophysiological mechanisms without original human data or systematic review methodology.
PubMed 34406560 · doi:10.1007/s11011-021-00814-4
What was done
This is a narrative review synthesizing literature on Alzheimer's disease histopathological hallmarks and the two-hit vascular hypothesis. The authors review proposed mechanisms involving neurovascular unit and blood-brain barrier dysfunction, pericyte degeneration, gliovascular breakdown, and reduced cerebral blood flow in the development of vascular beta-amyloid accumulation.
What was found
The abstract reports no numerical findings or empirical data. It outlines a mechanistic pathway wherein early neurovascular dysfunction and pericyte loss reduce beta-amyloid clearance, promote cerebral amyloid angiopathy, foster neuroinflammation, induce synaptic dysfunction, and ultimately drive neurodegeneration.
Why it matters
Highlighting neurovascular unit breakdown and pericyte loss as early upstream events in Alzheimer's disease supports investigating vascular targets for early biomarker discovery and therapeutic intervention.
Limits
This is a narrative review with no original experimental or clinical data. No sample size, quantitative metrics, or systematic methodology are reported in the abstract.
Cited by
- supports Vascular dysfunction promotes the formation of amyloid plaques in the brain.