Papers

Effects of microplastics on the toxicity of co-existing pollutants to fish: A meta-analysis

Meta-analysis of 1,380 biological endpoints from 55 studies found that microplastics in co-existing pollutant solutions significantly increased toxicity to fish beyond what the pollutants caused alone, particularly elevating immune system damage, metabolic disruption, and oxidative stress. The effect depended on fish life stage and microplastic size, but not on pollutant or polymer type.

Polystyrene Nanoplastics Hitch-Hike the Gut–Brain Axis to Exacerbate Parkinson’s Pathology

Scientists found that polystyrene nanoplastics can travel from the gut to the brain along nerve pathways and worsen Parkinson's disease in mice. The nanoplastics accelerated the clumping of alpha-synuclein, a protein central to Parkinson's, which triggered brain inflammation, damaged mitochondria, and impaired the cellular cleanup system. Mice exposed to both nanoplastics and the disease protein showed progressive physical and motor decline resembling Parkinson's symptoms.

The bioaccumulation and ecotoxicity of co-exposure of per(poly)fluoroalkyl substances and polystyrene microplastics to Eichhornia crassipes

This study found that when microplastics and forever chemicals (PFAS) coexist in water, the microplastics increase how much PFAS accumulates in water hyacinth plants and worsen the toxic effects compared to PFAS exposure alone. The finding is relevant to human health because it shows microplastics can amplify the harmful effects of other pollutants already present in the environment.

Polystyrene microplastics enhanced the effect of PFOA on Chlorella sorokiniana: Perspective from the cellular and molecular levels

This study found that polystyrene microplastics made the toxic effects of PFOA (a "forever chemical") worse on algae by increasing cell membrane permeability, allowing more PFOA to enter the cells. The findings matter because microplastics and PFOA often exist together in the environment, and their combined effect can be more harmful than either pollutant alone.

Exposure routes induce differential intestinal damage in zebrafish from polystyrene microplastics

Eco-corona formation on aminated nanoplastics interacted with extracellular polymeric substances from bloom-forming cyanobacteria: Insightful mechanisms with DFT study

This study examined how tiny plastic particles with amino surface groups interact with substances released by algae in water, forming a coating called an "eco-corona." Understanding how nanoplastics behave and clump together in natural water environments is important because it affects how easily they move through ecosystems and potentially into drinking water sources.

Polystyrene microplastics attenuated the impact of perfluorobutanoic acid on Chlorella sorokiniana: Hetero-aggregation, bioavailability, physiology, and transcriptomics

Researchers studied how polystyrene microplastics interact with PFBA (a type of forever chemical) when both are present around green algae. Surprisingly, the microplastics actually reduced the toxic effects of PFBA on the algae by binding to the chemical and making it less available, showing that pollutant interactions in the environment can be more complex than expected.

Microplastics in lakes: Distribution patterns and influencing factors

This review analyzed 84 studies across 64 lakes worldwide to understand where microplastics tend to concentrate in freshwater systems. Microplastic levels were highest near areas of heavy human activity and water inflows, and concentrations in lake sediments have been increasing over time, which matters because lakes are important sources of drinking water.

Aged polylactic acid microplastics with ultraviolet irradiation stunted pakchoi (Brassica chinensis L.) germination and growth with cadmium in hydroponics

Researchers found that UV-aged biodegradable PLA microplastics were more harmful to plant growth than fresh ones, especially when combined with cadmium contamination. The aged microplastics increased oxidative damage and reduced nutrient uptake in pakchoi plants. This matters because biodegradable plastics are promoted as eco-friendly alternatives, but they may become more toxic as they break down in the environment.

Effects of polystyrene microplastics on the metabolic level of Pseudomonas aeruginosa

This study examined how polystyrene microplastics affect the metabolism of Pseudomonas aeruginosa, a common water bacterium that can cause serious infections in humans. The microplastics significantly disrupted the bacteria's metabolism, reducing its ability to process lipids, amino acids, and energy-producing molecules. These metabolic changes could alter how this pathogen behaves in the environment and potentially affect its ability to cause disease.

Response mechanisms of Chlorella sorokiniana to microplastics and PFOA stress: Photosynthesis, oxidative stress, extracellular polymeric substances and antioxidant system

Researchers exposed green algae to polystyrene microplastics and PFOA (a forever chemical) both separately and together, finding that the combination was more toxic than either pollutant alone. Microplastics mainly harmed the algae by blocking light for photosynthesis, while PFOA caused oxidative damage inside cells. Since microplastics and PFAS often co-exist in polluted water, their combined effects on aquatic food chains could be greater than studies of individual pollutants suggest.

The ecology of the plastisphere: Microbial composition, function, assembly, and network in the freshwater and seawater ecosystems

Researchers studied the communities of bacteria and fungi that colonize microplastic surfaces in freshwater and seawater, forming what scientists call the plastisphere. These microplastic-associated communities were distinctly different from those in surrounding water, and included a higher proportion of disease-causing organisms and species involved in pollutant degradation. The findings suggest that microplastics create new habitats that can harbor pathogens and alter natural microbial ecosystems in ways that may affect water quality and human health.

Effect of microplastics on oxytetracycline trophic transfer: Immune, gut microbiota and antibiotic resistance gene responses

When polypropylene microplastics and the antibiotic oxytetracycline were present together in water, the microplastics acted as carriers that increased antibiotic buildup in shrimp and fish through the food chain. This combination caused more gut and liver damage, weakened immune defenses, and promoted the spread of antibiotic-resistant bacteria. The findings highlight that microplastics can make antibiotic pollution worse by helping resistant genes move up the food chain.

Polystyrene microplastics alter the trophic transfer and biotoxicity of fluoxetine in an aquatic food chain

Polystyrene microplastics changed how the antidepressant fluoxetine moves through a food chain of brine shrimp and zebrafish. While microplastics increased fluoxetine buildup in shrimp, they actually reduced its accumulation in fish and lessened some of its brain-specific toxic effects. However, microplastics worsened other types of damage in fish, including oxidative stress and immune disruption, showing that the combined effects of these pollutants are unpredictable.

Interaction of titanium dioxide nanoparticles with PVC-microplastics and chromium counteracts oxidative injuries in Trachyspermum ammi L. by modulating antioxidants and gene expression

Scientists studied how PVC microplastics and chromium (a toxic heavy metal) together affect the growth of ajwain, an important medicinal and food plant. The combination of these pollutants reduced plant growth, damaged photosynthesis, and increased toxic stress more than either pollutant alone. This is relevant to food safety because agricultural soils are increasingly contaminated with both microplastics and heavy metals, which together could reduce crop quality and nutritional value.

Weathering Process and Characteristics of Microplastics in Coastal Wetlands: A 24-Month In Situ Study

Researchers placed five types of common microplastics in a coastal wetland for 24 months and tracked how they broke down over time. All plastics showed increasing surface damage, chemical changes, and fragmentation, with polystyrene degrading the fastest. The study demonstrates that natural environments actively break microplastics into ever-smaller pieces, which are more easily taken up by organisms and can eventually enter the human food chain.

Aging increases the phytotoxicity of polyethylene and polypropylene to Lactuca Sativa L. compared to original microplastics

This study found that microplastics from polyethylene and polypropylene become more toxic to lettuce plants after aging in the environment, reducing plant growth by roughly 25-28% compared to fresh plastic particles. The aged plastics disrupted the soil around plant roots, blocking nutrient absorption and interfering with key metabolic processes. This matters because most microplastics in farm soil have been weathered over time, meaning their real-world effects on food crops may be worse than lab studies using new plastics suggest.

Microglial clearance of Alzheimer's amyloid-beta obstructed by nanoplastics

Researchers found that polystyrene nanoplastics interfere with the brain's ability to clear amyloid-beta, the protein that builds up in Alzheimer's disease. The nanoplastics accelerated amyloid clumping and drained the energy of brain immune cells that normally clean up these harmful proteins. This study suggests that nanoplastic exposure could worsen or contribute to the development of Alzheimer's disease.

The emerging threat of hybrid microplastics: Impacts on per(poly)fluoroalkyl substance bioaccumulation and phytotoxicity in floating macrophytes

This study examined how mixtures of different microplastic types interact with PFAS (forever chemicals) and found that more diverse microplastic mixtures increased the absorption and toxicity of PFAS in aquatic plants. The complexity of real-world microplastic pollution, where multiple plastic types coexist, appears to make forever chemical contamination worse. This finding is important because most lab studies test single plastic types, potentially underestimating the actual environmental risk.

Microplastics in the third pole of the world: Abundance and ecological risk assessment

Researchers measured microplastic contamination across the Yarlung Zangbo River Basin on the Tibetan Plateau, one of the most remote regions on Earth. While overall levels were lower than in more populated areas, concentrations increased downstream near human settlements, with sewage treatment plants identified as a significant entry point. The study shows that even the world's highest and most isolated ecosystems are not free from microplastic pollution.

Advances in quantifying the drivers of the occurrence, transport, and fate of freshwater microplastics

This review analyzes the many factors that control where freshwater microplastics end up, finding that concentrations vary by seven orders of magnitude across different locations worldwide. Microorganisms, plants, and animals all interact with microplastics in ways that change how the particles move and accumulate in water systems. Understanding these complex transport networks is essential for predicting human exposure through drinking water and freshwater food sources.

The processes and transport fluxes of land-based macroplastics and microplastics entering the ocean via rivers

This review traces the full journey of plastic waste from land to ocean via rivers, covering how plastics enter waterways and the methods scientists use to estimate how much reaches the sea. About 80% of marine plastic pollution comes from land-based sources, and better monitoring and modeling are needed to improve estimates. Understanding these transport pathways is essential for reducing the microplastic contamination that ultimately enters the seafood supply and affects human health.

Network Complexity and Stability of Microbes Enhanced by Microplastic Diversity

In a large laboratory experiment with 600 samples, researchers found that having a greater diversity of microplastic types in lake sediments actually made microbial communities more complex and stable. Warmer temperatures amplified this effect, suggesting climate change could further alter how microplastics interact with environmental microorganisms. While the microbes became more interconnected, this does not necessarily mean healthier ecosystems, since the altered microbial networks could include shifts that affect nutrient cycling and water quality in ways that impact human health.

Automated machine learning-based prediction of microplastics induced impacts on methane production in anaerobic digestion

Researchers used automated machine learning to predict how microplastics in wastewater sludge affect methane production during anaerobic digestion. The study found that the type of microplastic mattered more than its size or concentration, with polystyrene associated with higher methane output while larger particles generally inhibited production. This approach offers a new data-driven tool for understanding how plastic contamination in sewage affects waste treatment processes.