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61,005 resultsShowing papers similar to Glutathione S-Transferases in Marine Copepods
ClearTwo sigma and two mu class genes of glutathione S-transferase in the waterflea Daphnia pulex: Molecular characterization and transcriptional response to nanoplastic exposure
Researchers cloned and characterized four glutathione S-transferase (GST) genes from the freshwater crustacean Daphnia pulex, identifying two mu-class and two sigma-class isoforms involved in detoxification responses. The characterization of these antioxidant enzymes provides a foundation for using Daphnia as a bioindicator of oxidative stress from pollutants including microplastics.
Weathered polyethylene microplastics exposure leads to modulations in glutathione-S-transferase activity in fish
Researchers reported that exposure to weathered polyethylene microplastics modulates glutathione-S-transferase activity in fish, indicating that environmentally aged microplastics can trigger oxidative stress responses in marine organisms.
Mechanisms of Pollution Tolerance in Aquatic Organisms
This review examined how aquatic organisms tolerate pollution from heavy metals, organic compounds, and emerging contaminants such as microplastics, focusing on molecular, biochemical, and physiological adaptation strategies. Detoxification pathways including antioxidant responses and metallothionein induction were identified as central mechanisms.
Genome-wide identification glutathione-S-transferase gene superfamily in Daphnia pulex and its transcriptional response to nanoplastics
Researchers identified 35 glutathione S-transferase (GST) genes in the water flea Daphnia pulex and examined their response to nanoplastic exposure. The study found that different GST gene subfamilies showed distinct expression patterns after nanoplastic exposure at 96 hours and 21 days, suggesting these detoxification enzymes play varied roles in the organism's response to plastic pollution.
Microplastics Residence Time in Marine Copepods: An Experimental Study
Laboratory experiments measured how long microplastics remain in marine copepods after ingestion, finding that residence times vary by particle type and size, with some particles persisting longer than others and informing estimates of microplastic transfer through marine food webs.
Emerging environmental stressors and oxidative pathways in marine organisms: Current knowledge on regulation mechanisms and functional effects
This review summarized current knowledge on how emerging environmental pollutants including microplastics, heavy metals, and other stressors trigger oxidative stress in marine organisms, examining regulatory mechanisms from pre-transcriptional to catalytic levels.
Is microplastic an oxidative stressor? Evidence from a meta-analysis on bivalves
Microplastics induce time-dependent oxidative stress in bivalves, with antioxidant enzymes (GPx, GST, SOD) increasing during short-term exposure but declining after long-term exposure, while glutathione levels and catalase activity remained elevated throughout and may serve as reliable biomarkers of sublethal microplastic effects.
Pollution Biomarkers in the Framework of Marine Biodiversity Conservation: State of Art and Perspectives
This review examines how molecular and cellular biomarkers can be used to detect the effects of chemical pollution, including from microplastics, on marine organisms and biodiversity. The study highlights the importance of integrating biomarker data into environmental monitoring frameworks to better assess pollution impacts on marine ecosystems.
Microplastics Exposure Causes Negligible Effects on the Oxidative Response Enzymes Glutathione Reductase and Peroxidase in the Oligochaete Tubifex tubifex
Researchers exposed the freshwater oligochaete Tubifex tubifex to polyethylene microplastics at environmentally relevant concentrations, finding negligible effects on oxidative stress markers after the exposure period. The results suggest this bioindicator species may have some tolerance to microplastic exposure at tested concentrations.
Effects of microplastics on marine copepods
This review examines how microplastics affect marine copepods, the tiny crustaceans that form a critical link in ocean food chains. Researchers found that copepods readily ingest microplastics, which can block their digestive tracts, reduce feeding, trigger immune responses, deplete energy reserves, and impair reproduction. The effects depend on the size, shape, and chemical properties of the plastic particles, and microplastics can also carry other toxic pollutants that amplify the harm.
Evaluation of microplastic toxicity in accordance with different sizes and exposure times in the marine copepod Tigriopus japonicus
Researchers exposed marine copepods to polystyrene microbeads of two different sizes to understand how particle size and exposure duration affect toxicity. They found that both nano-sized and micro-sized particles increased reactive oxygen species levels inside cells and altered antioxidant gene expression and enzyme activity. The study provides important molecular-level evidence that microplastic toxicity in marine organisms depends on both the size of the particles and how long organisms are exposed.
Does microplastic induce oxidative stress in marine invertebrates
This review examined whether microplastic ingestion induces oxidative stress in marine invertebrates, finding evidence that microplastics can elevate reactive oxygen species and disrupt antioxidant defenses in species including mussels, sea urchins, and copepods. Oxidative stress is a key mechanism through which microplastics may cause cellular damage in marine animals.
Marine Copepods as a Microbiome Hotspot: Revealing Their Interactions and Biotechnological Applications
This paper is not primarily about microplastics. It reviews the microbiome (bacteria and fungi) living on and around marine copepods, tiny crustaceans that dominate ocean zooplankton, exploring applications in aquaculture and bioremediation of polluted marine environments. While copepods can interact with microplastics in the ocean food web, this study focuses on microbiology and biotechnology rather than microplastic contamination.
Bioinformatics studies and comparison of mRNA transcription of glutathione S-transferase gene in some tissues of common carp (Cyprinus carpio) and brown trout (Salmo trutta)
Not relevant to microplastics — this study compares gene expression of glutathione S-transferase (a detoxification enzyme) across multiple tissues in common carp and brown trout using bioinformatics and qPCR.
Microplastics at an environmentally relevant dose enhance mercury toxicity in a marine copepod under multigenerational exposure: Multi-omics perspective
Researchers exposed tiny marine organisms called copepods to microplastics and mercury together across three generations at levels found in the environment. While microplastics alone had little effect, they made mercury much more toxic by increasing how much mercury built up in the organisms' bodies. This study shows that microplastics can act as carriers that amplify the harmful effects of other environmental pollutants, with the damage worsening over generations.
Transgenerational Proteome Plasticity in Resilience of a Marine Copepod in Response to Environmentally Relevant Concentrations of Microplastics
Marine copepods were exposed to polystyrene microbeads at environmentally relevant concentrations for two generations followed by one recovery generation, with microplastic-exposed F1 copepods showing proteome changes linked to oxidative stress and energy metabolism, and F2 copepods raised in clean water showing partial but not complete proteome recovery. The findings demonstrate transgenerational effects of microplastic exposure at the protein level in a marine keystone organism.
Global Meta-Analysis and Review of Microplastic in Marine Copepods
This global meta-analysis examines how copepods — tiny crustaceans at the base of the ocean food chain — interact with microplastics. It finds that despite individually low ingestion rates, the sheer abundance of copepods makes them significant microplastic reservoirs, with potential consequences that ripple up the food chain to fish and ultimately humans.
Invertebrate responses to microplastic ingestion: Reviewing the role of the antioxidant system
Microplastic ingestion poses an oxidative challenge to invertebrates requiring upregulation of antioxidant defenses, but studies are limited to only seven taxa, dominated by polystyrene spheres <10 µm, and the lack of systematic experiments prevents identifying which specific microplastic characteristics drive the oxidative stress response.
Assessment of the effects of leachates from plastic items and boat coatings on Nitokra spinipes in the context of global change
Researchers assessed the toxicological effects of leachates derived from plastic items and boat antifouling coatings on the marine harpacticoid copepod Nitokra spinipes, exposing this ecotoxicology test organism to extracts generated as plastics and biocide-containing coatings physically degrade in aquatic environments. The study evaluated how chemical leaching from both plastic debris and boat coatings affects crustacean survival and reproduction, contributing to understanding of the combined chemical hazards of plastic pollution in coastal waters.
Toxicity of microplastic particles and adsorbed fluoranthene to epibenthic copepods
Researchers exposed small bottom-dwelling copepods to polyethylene microplastics and fluoranthene-coated microplastics over several weeks, measuring effects on growth, reproduction, and survival. The study found that both the plastic particles and the attached chemical caused toxic effects, providing evidence that microplastics and their sorbed pollutants harm even tiny marine invertebrates.
Toxicological Impacts of Microplastics: Effects on Levels of Cellular Thiols in Mytilus galloprovincialis
Researchers investigated how microplastic exposure affects cellular thiol antioxidants in Mediterranean mussels, finding that short-term exposure altered glutathione and ovothiol levels, indicating oxidative stress as a key mechanism of microplastic toxicity in benthic species.
First Report of OvoA Gene in Marine Arthropods: A New Candidate Stress Biomarker in Copepods
Researchers reported the first identification of the OvoA gene in marine arthropods, specifically in copepods, finding that OvoA expression increases under oxidative stress conditions, establishing it as a candidate stress biomarker for marine pollution monitoring.
First Assessment of Plasticizers in Marine Coastal Litter-Feeder Fauna in the Mediterranean Sea
Five small-sized Mediterranean amphipod crustacean species from coastal litter-feeder habitats were analyzed for plasticizer contamination, finding detectable levels and identifying these litter-feeding invertebrates as potential monitors of microplastic-associated chemical pollution.
Do microplastics induce oxidative stress in marine invertebrates?
This review examined whether marine invertebrates exposed to microplastics show evidence of oxidative stress — a common cellular response to toxic injury — finding support for this effect across multiple species and polymer types. Oxidative stress is a key mechanism by which microplastics may harm marine organisms.