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Exploring the Interaction of Human α-Synuclein with Polyethylene Nanoplastics: Insights from Computational Modeling and Experimental Corroboration
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Researchers used computer simulations and lab experiments to study how polyethylene nanoplastics interact with alpha-synuclein, a brain protein linked to neurodegenerative conditions. They found that nanoplastics caused the protein to change its shape and form a compact structure that interacts more strongly with itself, potentially promoting clumping. The study suggests a possible mechanism by which nanoplastics could influence protein behavior in the brain, though the health implications remain to be determined.
Plastics, particularly microplastics (MPs) and nanoplastics (NP), have become major environmental and health concerns due to their high chemical stability. The highly hydrophobic plastics enter living organisms through reversible interactions with biomolecules, forming biocoronas. Following recent reports on plastics breaching the blood-brain barrier, the binding behavior of human α-synuclein (hαSn) with polyethylene-based (PE) plastics was evaluated by using molecular dynamics simulations and experimental methods. The results provided three important findings: (i) hαSn transitions from an open helical to a compact conformation, enhancing intramolecular interactions, (ii) nonoxidized PE NPs (NPnonox) rapidly adsorb hαSn, as supported by experimental data from dynamic light scattering and adsorption isotherms, altering its structure, and (iii) the oxidized NP (NPox) failed to capture hαSn. These interactions were dominated by the N-terminal domain of hαSn, with major contributions from hydrophobic amino acids. These findings raise concerns about the potential pharmacological effects of NP-protein interactions on human health.
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Computer simulations suggest that nanoplastics — tiny plastic particles under 5 nanometers — can cause proteins to misfold when they bind together. Misfolded proteins are linked to diseases like Alzheimer's, making this an early warning that nanoplastics may pose risks at the molecular level in living cells.
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Researchers used coarse-grained molecular dynamics simulations to study nanoplastic interactions with beta-amyloid fibrils, finding that nanoplastics can influence amyloid aggregation and potentially play a role in neurodegenerative disease pathways.
Evidence for Protein Misfolding in the Presence of Nanoplastics
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Researchers used molecular dynamics simulations to demonstrate that nanoplastic particles can induce protein misfolding in biological systems. The study represents an early model-based investigation of how nanoplastics may interfere with protein structure and function at the molecular level.
Insights into the Binding Interactions between Microplastics and Human α-Synuclein Protein by Multispectroscopic Investigations and Amyloidogenic Oligomer Formation
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Researchers found that common microplastics -- especially polystyrene -- can bind to alpha-synuclein, a brain protein whose clumping is a hallmark of Parkinson's disease. The microplastics altered the protein's structure and promoted the formation of toxic clumps called amyloidogenic oligomers. This suggests that microplastic exposure could potentially accelerate the protein misfolding process linked to Parkinson's and other neurodegenerative diseases.
Molecular insights into nanoplastics-peptides binding and their interactions with the lipid membrane
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Using computer simulations, researchers studied how nanoplastics interact with small protein fragments and cell membranes at the molecular level. They found that nanoplastics readily bind to proteins, forming a coating called a protein corona, which changes how the plastics behave when they encounter cell membranes. This research helps explain how nanoplastics might enter human cells, since the protein coating could either help or hinder the particles from crossing biological barriers.
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