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Survival Costs Flavor: Microplastics Reprogram Metabolic Resource Allocation and Compromise Oyster Quality under Ocean Acidification.
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Pacific oysters exposed to ocean acidification and microplastics in a lab study showed reduced texture quality, depleted protein and lipid reserves, and changes in flavor-related compounds. Gene activity analysis showed the oysters shifted energy toward cellular repair and stress responses, using up nutrients otherwise linked to taste and nutritional quality.
Ocean acidification (OA) and microplastic (MP) pollution are widespread marine stressors, yet their interactive effects on seafood quality and molecular metabolism remain unclear. This study investigated the combined effects of OA (pH 7.7) and MPs (2 and 200 μg/L) on the Pacific oyster (Magallana gigas). OA was the primary driver of textural deterioration, significantly reducing springiness and chewiness, while combined stress synergistically depleted protein and lipid reserves. Distinct lipid remodeling strategies were identified: OA induced DHA accumulation potentially associated with membrane stabilization, whereas MPs triggered EPA and ARA upregulation associated with stress and immune responses. The flavor profile was severely compromised, characterized by depletion of umami amino acids, nucleotide redistribution, and altered succinate contribution. Transcriptomic analysis revealed that high MP exposure activated genome maintenance and DNA repair-associated pathways, including the Fanconi anemia pathway, superimposed on OA-associated metabolic suppression. Concurrent upregulation of nucleotide salvage (APRT, HPRT) and amino acid catabolic genes (GLS, GDH) suggests increased utilization of flavor metabolites for energetic demands. These findings support a bioenergetic trade-off in which oysters exposed to OA and MPs reallocate resources from nutritional and sensory quality toward cellular maintenance and stress adaptation, highlighting underrecognized consequences of climate change and plastic pollution for seafood quality.
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Researchers exposed oysters to polystyrene microplastics of two sizes under both normal and acidified ocean conditions to simulate climate change. They found that ocean acidification and microplastics interacted in complex ways, with smaller microplastics under acidic conditions altering the oysters' metabolic profiles in their digestive organs. This study highlights that climate change may change how microplastics affect the shellfish many people eat.
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Researchers exposed Pacific oysters to different concentrations of microplastics for 15 days and then measured changes in flavor-related compounds. They found that microplastic exposure altered the oysters' odor characteristics and amino acid profiles, with moderate concentrations actually increasing the umami taste value. The study raises new questions about how microplastic contamination might affect the quality and safety of commercially important shellfish.
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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.
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