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Oligomer nanoparticle release from polylactic acid plastics catalysed by gut enzymes triggers acute inflammation
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Researchers found that polylactic acid (PLA), a popular 'eco-friendly' biodegradable plastic, releases nanoplastic particles when broken down by gut enzymes during digestion. In mice, these PLA fragments accumulated in the liver, intestine, and brain, causing intestinal damage and acute inflammation by interfering with a key immune enzyme, raising important questions about whether biodegradable plastics are truly safer for human health.
The health risks of exposure to 'eco-friendly' biodegradable plastics of anthropogenic origin and their effects on the gastrointestinal tract are largely unknown. Here we demonstrate that the enzymatic hydrolysis of polylactic acid microplastics generated nanoplastic particles by competing for triglyceride-degrading lipase during gastrointestinal processes. Nanoparticle oligomers were formed by hydrophobically driven self-aggregation. In a mouse model, polylactic acid oligomers and their nanoparticles bioaccumulated in the liver, intestine and brain. Hydrolysed oligomers caused intestinal damage and acute inflammation. A large-scale pharmacophore model revealed that oligomers interacted with matrix metallopeptidase 12. Mechanistically, high binding affinity (K = 13.3 μmol l) of oligomers to the catalytic zinc-ion finger domain led to matrix metallopeptidase 12 inactivation, which might mediate the adverse bowel inflammatory effects after exposure to polylactic acid oligomers. Biodegradable plastics are considered to be a solution to address environmental plastic pollution. Thus, understanding the gastrointestinal fates and toxicities of bioplastics will provide insights into potential health risks.
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Oligomer-Nanoparticle Release from PLA Bioplastics Catalyzed by Gut Enzymes and Its Acute Inflammatory Effect
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Researchers found that gut lipase enzymes catalyze rapid hydrolysis of polylactic acid (PLA) bioplastic microplastics, generating an excess of oligomeric nanoplastic particles that form via hydrophobic self-aggregation and bioaccumulate in liver, intestine, and brain tissues in vitro and in vivo, triggering acute inflammatory responses.
Gastrointestinal Incomplete Degradation Exacerbates Neurotoxic Effects of PLA Microplastics via Oligomer Nanoplastics Formation
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This study found that when PLA microplastics -- a common biodegradable plastic -- are partially broken down in the digestive system, they form smaller oligomer nanoplastics that are actually more toxic to the brain than the original particles. Mice exposed to these digestive breakdown products showed worse neurological effects, challenging the assumption that biodegradable plastics are inherently safer for human health.
Polylactic acid microplastics as metabolic disruptors: Linking gut dysbiosis to systemic toxicity by disrupting microbiota-host co-metabolism.
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This review pulls together existing research on tiny plastic particles from polylactic acid (PLA)—a "biodegradable" plastic used in things like food packaging and disposable cutlery—showing they can build up in the gut, damage its protective lining, and throw off the balance of gut bacteria. Scientists think this gut disruption may trigger inflammation and even affect the liver and body-wide metabolism, though this specific chain of events hasn't been directly proven yet for PLA particles. The takeaway: even "eco-friendly" plastics may carry hidden health risks, and more research is needed to understand exactly how they affect our
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Researchers found that polylactic acid (PLA) — a plastic marketed as biodegradable — caused liver damage in mice whether the particles were ingested through food or inhaled through air, disrupting gut and lung microbiomes along the way. The findings challenge the assumption that biodegradable plastics are safe and suggest that micro- and nanoplastics from any source can pose a risk to liver health.
Dynamic Risk Profiling of Polylactic Acid‐Based Food Packaging: From Migration‐Derived Toxicity Biomarkers to Green Technology‐Driven Safety Optimization
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PLA plastic (a popular "eco-friendly" alternative to regular plastic used in food containers and utensils) can break down when exposed to heat and moisture, potentially releasing tiny plastic particles and chemical byproducts into your food. This review of existing research finds that these released substances have been linked to gut damage, inflammation, and cell stress in lab studies, suggesting that "biodegradable" packaging isn't automatically safer for direct food contact than conventional plastic. The authors argue that current safety rules don't adequately account for this risk and call for stricter testing and better-designed packaging before these products are considered truly saf
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