Observation of metastable Aβ amyloid protofibrils by atomic force microscopy
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Discussion
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Implication
In vitro study reveals metastable protofibrils preceding mature amyloid fibrils in synthetic amyloid-beta, suggesting stabilizing intermediate aggregates could offer a therapeutic target.
Key Points
- To characterize the early intermediate stages of amyloid fibril assembly for Alzheimer's-associated beta-amyloid protein variants.
- Monitored in vitro fibril formation kinetics of synthetic Abeta1-40 and Abeta1-42 peptide variants.
- Visualized real-time structural changes, aggregate morphologies, and intermediate species using atomic force microscopy.
- Both Abeta variants initially formed small, ordered aggregates termed protofibrils that expanded slowly and then disappeared rapidly as mature fibrils developed.
- Abeta1-42 assembled into aggregates much more rapidly than Abeta1-40, aligning with its known clinical role in early-onset Alzheimer's disease.
- Mature amyloid fibrils emerged with two distinct structural morphologies following the clearance of the metastable protofibrillar precursors.
Cite This Study
Harper et al. (1997) studied this question.