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PVC Does Not Influence Cadmium Uptake or Effects in the Mussel (Mytilus edulis)
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Researchers found that PVC microparticles did not significantly influence cadmium uptake or its biological effects in the blue mussel (Mytilus edulis), suggesting that this particular plastic-metal combination does not enhance cadmium bioavailability under the tested conditions. The study cautions against generalizing the 'Trojan horse' hypothesis across all plastic types and contaminant pairings.
Microplastics have become a global concern in recent years. In this study, we studied (i) whether the presence of polyvinyl chloride (PVC) microparticles may affect cadmium (Cd) uptake in mussel (Mytilus edulis); and (ii) the biological effects of PVC microparticles exposure alone or in combination with Cd. Significant Cd uptake in digestive gland was observed following Cd exposure. However, PVC did not significantly increase Cd uptake compared with Cd alone treatment. In terms of biological impacts, significantly lower neutral red retention (NRR) time and elevated expression of Metallothionein isoform 20-IV (MT-20) were observed in mussels exposed to Cd alone, or combined with microplastics, yet there was no significant difference between them. catalase (CAT) expression only showed a significant increase in mussels exposed to Cd alone. This work provides an insight into the relationship on resulting biological impacts between these two contaminants.
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Scientists found that tiny plastic particles in the ocean can carry toxic cadmium and deliver it to mussels, but surprisingly, the plastic-bound cadmium was actually less harmful than cadmium alone, possibly because the metal doesn't fully release from the plastic once eaten. Interestingly, plastics that had already been weathered by sun and seawater picked up less cadmium than fresh plastic. Since mussels and other seafood are a major way microplastics and their hitchhiking pollutants enter the human food chain, this research helps clarify how much of a risk these combined pollutants actually pose to the mar
A comparison with natural particles reveals a small specific effect of PVC microplastics on mussel performance
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Effects of PVC microplastics on marine animals were compared to effects of natural particles at equivalent concentrations, to distinguish plastic-specific effects from generic particle effects. The comparison revealed a small specific effect of PVC microplastics beyond what natural particle exposure causes, suggesting that many microplastic impacts may be partly attributable to physical particle load rather than plastic chemistry alone.
In Vitro Effects of Mercury (Hg) on the Immune Function of Mediterranean Mussel (Mytilus Galloprovincialis) Are Enhanced in Presence of Microplastics in the Extracellular Medium
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Researchers investigated whether the presence of microplastics in seawater amplifies mercury toxicity in Mediterranean mussels by acting as a vector for metal accumulation. They found that microplastics enhanced mercury uptake in mussel immune cells, supporting the Trojan horse hypothesis that plastic particles deliver concentrated doses of co-contaminants to filter feeders. The study raises concern about the combined toxicity of microplastics and heavy metals in marine organisms.
Effects of microplastics alone or with sorbed oil compounds from the water accommodated fraction of a North Sea crude oil on marine mussels (Mytilus galloprovincialis)
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Researchers investigated whether polystyrene microplastics could act as a Trojan horse for oil pollutants in marine mussels and found that while mussels accumulated PAHs from crude oil exposure, microplastics alone did not significantly enhance pollutant transfer or cause additional toxic effects.
Co-exposure to Microplastics and Cadmium: Effects on DNA Damage in Mytilus Galloprovincialis
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This study investigated how co-exposure to microplastics and cadmium affects DNA damage in the Mediterranean mussel Mytilus galloprovincialis. Microplastics acted as vectors for cadmium, and combined exposure resulted in greater genotoxic effects than either pollutant alone.
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.