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alpha2-Macroglobulin as a beta-amyloid peptide-binding plasma protein
1Division of CNS Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana 46285, U.S.A.
Journal of Neurochemistry
|July 1, 1997
Summary
Human alpha2-macroglobulin (alpha2M) binds beta-amyloid (A beta) peptides, suggesting a role in Alzheimer's disease (AD) pathology. This interaction may influence A beta clearance from the brain.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Beta-amyloid (A beta) peptide aggregates in Alzheimer's disease (AD) brain plaques.
- Mechanisms for soluble A beta clearance are poorly understood.
Purpose of the Study:
- Investigate the interaction between alpha2-macroglobulin (alpha2M) and A beta.
- Determine if alpha2M influences A beta clearance or aggregation.
Main Methods:
- Binding assays using radiolabeled A beta (125I-A beta(1-42)) and alpha2M.
- Assessing the effect of Zn2+, Ca2+, other peptides, and cytokines on binding.
- Evaluating alpha2M's effect on A beta proteolysis.
Main Results:
- Human alpha2M binds 125I-A beta(1-42) with high affinity.
- Zn2+ enhances binding, while other A beta forms inhibit it.
- Alpha2M binding protects A beta from proteolysis and is inhibited by alpha1-antichymotrypsin.
Conclusions:
- Alpha2-macroglobulin (alpha2M) may act as a carrier protein for beta-amyloid (A beta).
- This interaction could potentially impact A beta clearance in Alzheimer's disease (AD).