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A Molecular Integrative Study on the Inhibitory Effects of WRR and ERW on Amyloid β Peptide (1-42) Polymerization and
Zhongyun Wu1, Lianmeng Ye1, Nan Yuan1
1Laboratory of Biopharmaceuticals and Molecular Pharmacology, School of Pharmaceutical Sciences, Hainan University, Haikou 570228, China.
Abstract:
Alzheimer's disease (AD) is a neurodegenerative disease and the main pathological characteristic of AD is the deposition of Aβ42 in the brain. Inhibition of Aβ42 polymerization is one of the important research directions. Due to the pathological complexity of Alzheimer's disease, studies on Aβ42 polymerization inhibitors have not made significant progress worldwide. Using an independently constructed structure database of oligopeptides, in this study, molecular docking, umbrella sampling analysis of free energy, ThT fluorescence detection of Aβ42 polymerization, transmission electron microscopy, and flow cytometry detection of reactive oxygen species (ROS) and apoptosis were performed to screen tripeptides and pentapeptides that inhibit polymerization. It was found that two tripeptides, i.e., WRR and ERW, bind stably to the core of Aβ42 polymerization in the molecular dynamics analysis, and they significantly inhibited the aggregation of Aβ42 and reduced their cell toxicity in vitro.
Insights
Researchers identified two tripeptides, WRR and ERW, that inhibit amyloid-beta 42 (Aβ42) polymerization. These peptides reduce Aβ42 aggregation and associated cell toxicity, offering potential therapeutic strategies for Alzheimer's disease (AD).
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Alzheimer's disease (AD) is characterized by amyloid-beta 42 (Aβ42) deposition in the brain.
- Inhibiting Aβ42 polymerization is a key research area for AD therapeutics.
- Developing effective Aβ42 polymerization inhibitors remains challenging due to disease complexity.
Purpose of the Study:
- To screen for novel tripeptide and pentapeptide inhibitors of Aβ42 polymerization.
- To investigate the mechanism of Aβ42 inhibition by identified peptides.
- To evaluate the efficacy of these peptides in reducing Aβ42-induced cellular toxicity.
Main Methods:
- Utilized a custom oligopeptide structure database for screening.
- Employed molecular docking and molecular dynamics for binding analysis.
- Assessed Aβ42 polymerization using ThT fluorescence assays.
- Evaluated cellular effects via transmission electron microscopy, ROS, and apoptosis detection.
Main Results:
- Two tripeptides, WRR and ERW, demonstrated stable binding to the Aβ42 polymerization core.
- WRR and ERW significantly inhibited Aβ42 aggregation in vitro.
- These peptides effectively reduced Aβ42-induced reactive oxygen species (ROS) and apoptosis.
Conclusions:
- Tripeptides WRR and ERW are potent inhibitors of Aβ42 polymerization.
- These peptides show promise in mitigating the cellular toxicity associated with Alzheimer's disease.
- Further research into these peptides could lead to new AD therapeutic interventions.
