We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Biomarker Responses in the Marine Mussel Mytilus Edulis Indicate Significant Toxicological Effects of Polyethylene Microplastics
AI summary Read the abstract
Scientists exposed mussels to microplastic particles for just three days and found real damage: broken DNA, cell stress, and weakened internal cell defenses. Since mussels and other shellfish are commonly eaten and also serve as an early warning system for ocean pollution, this research suggests microplastics in our waters could be causing cellular harm—though more research is needed to know what this means for people who eat seafood or are otherwise exposed to microplastics long-term.
This study investigated the short‑term effects of polyethylene microplastics (PE‑MPs) on the marine mussel Mytilus edulis using a suite of cellular and subcellular biomarkers. A total of 225 mussels were collected from Umluj, Saudi Arabia, a relatively unimpacted coastal area of the Red Sea, and experimentally exposed for 72 h to spherical PE‑MPs (50 μm diameter) at nominal concentrations of 5, 10, 20, and 60 particles L. Genotoxicity, oxidative status, and cellular integrity were assessed by comet assay, thiobarbituric acid‑reactive substances (TBARS), superoxide dismutase (SOD) activity, and lysosomal membrane stability (LMS). At 60 particles L, DNA strand breakage increased markedly in hemocytes (13.09%) and gill cells (12.21%) relative to controls (2.14%; p < 0.01). Lipid peroxidation was 1.28 nmol TBARS mg protein and activity of gill SOD was decreased by 16.13% of control. LMS was significantly reduced from 134.4 min in controls to 53.2 min in the highest exposure (p < 0.01), suggesting impaired cellular homeostasis. Given the short exposure duration, these results are preliminary. They indicate that acute PE-MP exposure at the tested concentrations is associated with measurable genotoxicity, oxidative stress, and reduced lysosomal stability. Longer-term ecological implications remain to be investigated.
More Papers Like This
Oxidative Stress in Mussel Mytilus trossulus Induced by Different-Sized Plastics
AI summary Read the abstract
Researchers exposed mussels to both tiny polystyrene microparticles and larger polyethylene plastic fragments and found that both sizes triggered oxidative stress in the animals. The plastic exposure caused DNA damage, weakened cellular membranes, and destabilized immune cell structures in the mussels' gills and digestive glands. The findings indicate that plastics of any size and polymer type can be harmful to marine filter-feeding organisms.
Uptake and Effects of Microplastics on Cells and Tissue of the Blue Mussel Mytilus edulis L. after an Experimental Exposure
AI summary Read the abstract
Researchers exposed blue mussels to high-density polyethylene microplastics and found the particles were drawn into the gills and digestive system within just three hours. The microplastics triggered a strong inflammatory response and damaged cell membranes, providing direct evidence that microplastics can enter animal cells and cause significant tissue-level harm.
Comparative multi-biomarker hazard assessment of weathered environmental microplastics and their DMSO-extractable leachates in Mytilus galloprovincialis.
AI summary Read the abstract
Mussels were exposed in the lab to weathered microplastics collected from a Moroccan beach, along with chemicals extracted from those particles. Both caused cell damage, but the extracted chemicals caused stronger DNA damage and changes in gene activity than the plastic particles themselves, varying by plastic type.
Impact of Synthetic Microfibers on Cellular and Biochemical Biomarkers in Mussel Mytilus galloprovincialis
AI summary Read the abstract
Scientists found that tiny plastic fibers from clothing and fishing gear can harm mussels by damaging their cells and disrupting important body functions, even at pollution levels currently found in our oceans. This matters because mussels filter water and are eaten by humans, so plastic pollution that harms these shellfish could also affect the safety of seafood we consume. The study shows that microplastic pollution is already at levels that can damage marine life we depend on for food.
Microplastic ingestion in mussels from the East Mediterranean Sea: Exploring its impacts in nature and controlled conditions
AI summary Read the abstract
Mussels from fish farms in the eastern Mediterranean had the highest microplastic contamination, likely from plastic aquaculture equipment, while mussels from a Marine Protected Area had the lowest. The study found that higher microplastic levels in mussels were linked to measurable signs of oxidative stress, DNA damage, and nerve toxicity, showing that these filter-feeding shellfish -- commonly eaten by people -- are actively harmed by the plastic particles they ingest.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.