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61,005 resultsShowing papers similar to Antioxidant Capacity, Enzyme Activities Related to Energy Metabolism, and Transcriptome Analysis of Crassostrea hongkongensis Exposed to Hypoxia
ClearHemocyte Responses of the Oyster Crassostrea hongkongensis Exposed to Diel-Cycling Hypoxia and Salinity Change
Researchers examined hemocyte immune responses of Hong Kong oysters exposed to diel-cycling hypoxia and salinity fluctuations, conditions that co-occur in estuarine environments and were linked to mass mortality events in the field.
Hypoxia in the Blue Mussel Mytilus chilensis Induces Transcriptome Shift Associated with Endoplasmic Reticulum Stress, Metabolism, and Immune Response.
Scientists used gene expression analysis to study how low-oxygen conditions affect the blue mussel Mytilus chilensis at the molecular level. Researchers found that hypoxia triggered stress responses in the mussels' gills, digestive glands, and muscles, including cellular stress pathways, metabolic shifts, and immune changes. The study highlights how climate-driven oxygen depletion in coastal waters can stress economically important shellfish species.
Genome-wide identification and characterization of superoxide dismutases in four oyster species reveals functional differentiation in response to biotic and abiotic stress
Genome-wide analysis of superoxide dismutase (SOD) genes in four oyster species revealed that most extracellular Cu/Zn-SOD proteins appear to have lost enzymatic activity, with only one cytosolic form likely retaining function. Expression patterns differed in response to biotic and abiotic stressors, suggesting functional differentiation among SOD family members that may serve as biomarkers of environmental stress.
Effects of Hypoxia Stress on Survival, Antioxidant and Anaerobic Metabolic Enzymes, and Related Gene Expression of Red Swamp Crayfish Procambarus clarkii
Researchers studied how hypoxia stress affects the survival, antioxidant defenses, and metabolic enzyme activity of red swamp crayfish at different temperatures. The study found that oxygen consumption rates and stress responses varied significantly with both temperature and dissolved oxygen levels, providing important data for managing crayfish aquaculture conditions to reduce mortality from low-oxygen events.
Environmental and Sublethal Concentrations of Polystyrene Nanoplastics Induced Antioxidant System, Transcriptomic Responses, and Disturbed Gut Microbiota in Oyster Magallana Hongkongensis
Researchers exposed Hong Kong oysters to polystyrene nanoplastics at both environmentally realistic and higher concentrations. Even at the lower, real-world concentrations, the nanoplastics significantly altered the oysters' gut bacteria and gene expression patterns, while higher doses also triggered immune and antioxidant stress responses, raising concerns about food safety and ecosystem health.
Metabolic profiles and protein expression responses of Pacific oyster (Crassostrea gigas) to polystyrene microplastic stress
Researchers exposed Pacific oysters to polystyrene microplastics for 21 days and found the particles caused oxidative stress and disrupted the oysters' metabolism, particularly amino acid processing. Different microplastic concentrations triggered different metabolic changes in the oysters. Since oysters are a popular seafood, these findings raise questions about food safety and whether microplastic-stressed shellfish could affect consumer health.
Marine mussel metabolism under stress: Dual effects of nanoplastics and coastal hypoxia
This study examined how nanoplastics and low oxygen levels together affect marine mussels, finding that both stressors disrupted the animals' internal balance and energy metabolism. The combination of nanoplastics and oxygen-depleted water was more harmful than either stressor alone, damaging cellular defenses against oxidative stress. Since mussels are widely consumed as seafood, these findings raise questions about the safety of shellfish harvested from polluted, oxygen-poor coastal waters.
Effects of Acute Ammonia Stress on Antioxidant Responses, Histopathology and Ammonia Detoxification Metabolism in Triangle Sail Mussels (Hyriopsis cumingii)
Triangle sail mussels exposed to sub-lethal ammonia concentrations showed antioxidant enzyme activation followed by inhibition, with the highest stress responses in gills and hepatopancreas and histopathological damage suggesting oxidative stress as a key mechanism of ammonia toxicity.
Evaluation of antioxidant capacity and digestive enzyme activities in Mytilus galloprovincialis exposed to nanoplastics under different patterns of hypoxia
Mytilus galloprovincialis mussels exposed to polystyrene nanoplastics under hypoxic conditions showed compounded antioxidant impairment and digestive enzyme disruption compared to nanoplastic exposure alone. The study highlights that hypoxia, an increasingly common marine stressor, can amplify the toxicity of nanoplastic contamination.
The Combined Effects of Toxic Microcystis aeruginosa and Thermal Stress on the Edible Clam (Corbicula fluminea): Insights into Oxidative Stress Responses and Molecular Networks
Researchers exposed the edible clam Corbicula fluminea to combined thermal stress and toxic Microcystis aeruginosa cyanobacteria, finding that the combined stressors caused greater oxidative stress and physiological disruption than either alone, with implications for bivalve aquaculture during cyanobacterial bloom events.
Oxidative and metabolic responses in Crassostrea gasar under combined stressors of elevated temperature and microplastic exposure
Researchers exposed oysters (Crassostrea gasar) to polystyrene microplastics at different temperatures to assess their combined effects on oxidative stress and energy metabolism. The study found that both gills and digestive glands accumulated microplastics regardless of temperature, and that the combination of thermal stress and microplastic exposure produced distinct patterns of oxidative stress and metabolic disruption compared to either stressor alone.
H2O2-Induced Oxidative Stress Responses in Eriocheir sinensis: Antioxidant Defense and Immune Gene Expression Dynamics
This study examined how Chinese mitten crabs respond to oxidative stress caused by hydrogen peroxide, finding that their antioxidant defenses and immune gene activity initially ramp up but then collapse under prolonged or high-dose exposure. While not directly about microplastics, the findings are relevant because microplastics are known to trigger similar oxidative stress in aquatic organisms, and this research helps map the biological pathways involved.
Noncoding Variation and Transcriptional Plasticity Promote Thermal Adaptation in Oysters by Altering Energy Metabolism
Comparative genomic and transcriptomic analysis of two closely related oyster species from warm and cold environments found that noncoding sequence divergence and adaptive transcriptional plasticity underpin thermal adaptation, with warm-adapted oysters showing higher plasticity in energy metabolism genes that up-regulate ATP production and lipid catabolism in response to heat.
State of the antioxidant defense system in wedge clams from Bulgarian Black Sea as a measure of resistance to environmental impacts
Researchers assessed the antioxidant defense status of wedge clams (Donax trunculus) collected from multiple Bulgarian Black Sea sites in summer and autumn, measuring catalase, superoxide dismutase, glutathione peroxidase, glutathione-S-transferase, and glutathione. They found that enzyme activity varied seasonally and by site, with elevated GST at tourist-heavy localities in summer suggesting heightened detoxification responses to anthropogenic environmental pressure.
Impact of ocean acidification on the physiology of digestive gland of razor clams Sinonovacula constricta
Razor clams were exposed to CO2-driven seawater acidification for 35 days to examine effects on digestive gland physiology. Ocean acidification did not significantly reduce growth or survival but altered digestive enzyme activities and antioxidant responses in the digestive gland, suggesting sublethal effects on nutrient processing under future ocean conditions.
Adaptive response of triploid Fujian oyster (Crassostrea angulata) to nanoplastic stress: Insights from physiological, metabolomic, and microbial community analyses
Researchers exposed triploid Fujian oysters to nanoplastics for 14 days and studied their physiological, metabolic, and microbial responses. They found that the oysters showed strong adaptive capacity, adjusting their metabolism and gut microbial communities to cope with nanoplastic stress. The study provides important insights into how shellfish respond to increasing nanoplastic pollution in ocean environments.
Microplastics and low tide warming: Metabolic disorders in intertidal Pacific oysters (Crassostrea gigas)
Researchers exposed Pacific oysters to environmentally relevant concentrations of microplastics during a simulated tidal cycle and then subjected them to warming during low tide. They found that microplastic exposure disrupted the oysters' metabolism and made them more vulnerable to heat stress, with effects worsening over time even at very low particle concentrations. The study suggests that microplastic pollution may reduce the ability of intertidal shellfish to cope with rising temperatures.
Microplastic Contamination in Pacific Oysters (Crassostrea gigas) from Haizhou Bay: Tissue-Specific Distribution, Digestive Enzyme Dysfunction, and Lipid Metabolism Perturbation
This study systematically evaluated microplastic distribution in Pacific oysters from Haizhou Bay, China, finding MP contamination across all tissues examined and documenting that MP accumulation altered digestive enzyme activities and fatty acid metabolism in these commercially harvested shellfish.
Microplastic intake and enzymatic responses in Mytilus galloprovincialis reared at the vicinities of an aquaculture station
Researchers evaluated antioxidant defenses and oxidative stress markers in gills of Mediterranean mussels (Mytilus galloprovincialis) reared near an aquaculture station, finding that microplastics derived from aquaculture activities induced significant enzymatic stress responses.
Cytotoxicity of polystyrene nanoplastics involves mitochondrial dysfunction and DNA damage in hemocytes of the Pacific oyster
Researchers used an in vitro cellular bioassay with Pacific oyster hemocytes to investigate the toxicity of polystyrene nanoplastics, finding that 24-hour exposure caused mitochondrial dysfunction, elevated reactive oxygen species, and DNA damage. The results identify immune cell mitochondria as key targets of nanoplastic cytotoxicity in marine bivalves.
Hypoxic Preconditioning Enhances the Hypoxia Tolerance of the Pearl Oyster Pinctada fucata martensii and Is Associated with Changes in the Intestinal Microbiota
Scientists found that gradually exposing pearl oysters to low-oxygen conditions helped them survive better when oxygen levels dropped dangerously low, partly by changing the helpful bacteria in their guts. This "training" approach boosted the oysters' immune systems and increased the variety of gut bacteria that help with digestion and health. While this study focused on oysters, it shows how gut bacteria play an important role in helping animals adapt to stress, which could lead to insights about how our own gut health affects our ability to handle environmental challenges.
Combined effects of salinity and polystyrene microplastics exposure on the Pacific oysters Crassostrea gigas: Oxidative stress and energy metabolism
Researchers studied how salinity levels affect the toxicity of polystyrene microplastics in Pacific oysters and found that low salinity reduced microplastic uptake but created complex interactions with oxidative stress and energy metabolism. Smaller microplastics generally caused more biological disruption than larger ones across all salinity conditions. This is important because coastal oyster habitats frequently experience salinity changes, and the findings suggest environmental conditions can alter how harmful microplastics are to shellfish.
Microplastics induce dose-specific transcriptomic disruptions in energy metabolism and immunity of the pearl oyster Pinctada margaritifera
Pearl oysters (Pinctada margaritifera) exposed to three doses of polystyrene microbeads showed dose-dependent reductions in energy balance, and transcriptomic analysis revealed disruptions to pathways controlling immunity and energy metabolism that scaled with exposure concentration.
Hydrocarbons occurrence and transcriptomic response of oyster Crassostrea virginica from lagoons of the Southern Gulf of Mexico
Researchers measured polycyclic aromatic hydrocarbons and aliphatic hydrocarbons in water, sediment, and oyster tissue across eight lagoons in Mexico's Gulf coast, finding that contamination levels and detoxification gene expression in Crassostrea virginica oysters varied significantly by location, reflecting local oil and industrial pollution.