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Exploring the differences between mouse mAβ(1-42) and human hAβ(1-42) for Alzheimer's disease related properties and
Xiaoping Lv1, Wei Li, Ying Luo
1Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China.
Abstract:
The differences between mouse mAβ(1-42) and human hAβ(1-42), explored using CD and fluorescence spectroscopy, transmission electron microscopy, ROS fluorescent assay, and neuronal cell viability, revealed that mAβ(1-42) as a three-site mutant (R5G, Y10F and H13R) of hAβ(1-42) altered the metal (copper and zinc) binding sites, reduced the proneness to form β-sheet structures and aggregated fibrils, alleviated the generation of ROS, and decreased the cytotoxicity, in contrast to hAβ(1-42).
Insights
Mouse amyloid-beta (mAβ) is less toxic than human amyloid-beta (hAβ). This study found mAβ, a mutant of hAβ, forms fewer toxic aggregates and generates less reactive oxygen species (ROS), reducing neuronal cell death.
Area of Science:
- Biochemistry
- Neuroscience
- Molecular Biology
Background:
- Amyloid-beta (Aβ) peptides, particularly Aβ(1-42), are implicated in Alzheimer's disease pathogenesis.
- Understanding the structural and functional differences between human Aβ(1-42) (hAβ) and its mouse counterpart (mAβ) is crucial for developing effective therapeutic strategies.
Purpose of the Study:
- To investigate the biochemical and biophysical differences between hAβ(1-42) and mAβ(1-42).
- To assess the impact of these differences on Aβ aggregation, metal binding, reactive oxygen species (ROS) generation, and neuronal toxicity.
Main Methods:
- Circular Dichroism (CD) spectroscopy
- Fluorescence spectroscopy
- Transmission Electron Microscopy (TEM)
- ROS fluorescent assay
- Neuronal cell viability assays
Main Results:
- mAβ(1-42), a three-site mutant of hAβ(1-42), exhibited altered metal (copper and zinc) binding characteristics.
- mAβ(1-42) showed a reduced propensity to form β-sheet structures and amyloid fibrils compared to hAβ(1-42).
- mAβ(1-42) significantly alleviated ROS generation and decreased cytotoxicity in neuronal cells.
Conclusions:
- The specific mutations in mAβ(1-42) confer distinct structural and functional properties compared to hAβ(1-42).
- mAβ(1-42) presents reduced neurotoxic potential due to diminished aggregation and ROS production.
- These findings highlight critical differences in Aβ behavior relevant to Alzheimer's disease research and potential therapeutic interventions.
