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Exploring the Impact of Polystyrene Microplastic Beads on Male Gonads of the Marine Mussel, Mytilus galloprovincialis
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Researchers exposed marine mussels to polystyrene microplastic beads and examined the effects on male reproductive tissue. They found that the microplastics disrupted the structure of sperm-producing cells in a dose-dependent manner, accompanied by signs of oxidative stress and metabolic disturbance. The study raises concerns about the potential impact of microplastic pollution on the reproductive health of commercially and ecologically important marine species.
Plastic, with its remarkable versatility and numerous applications, has greatly benefited humanity. However, its extreme resistance to natural degradation means it persists in the environment for long periods, causing global environmental problems. Furthermore, the fragmentation of plastic waste leads to the formation of microplastics (MP), which are minuscule particles that can accumulate in aquatic ecosystems. This poses a threat to marine fauna and, indirectly, to humans, as it also endangers the reproductive health of individuals. This study aimed to investigate the effects of microplastics on the structure and function of the testis of Mytilus galloprovincialis, chosen as a model species for its ecological and commercial relevance. Mussels were exposed for 48 h to 5 μm polystyrene MPs at two concentrations (0.5 and 1 μg/mL), then the testes were subjected to morphological and molecular analyses. Morphological analyses revealed that MPs alter the structure of the sperm cyst in a dose-dependent manner, disrupting cellular interactions between germ cells. These structural deviations may be linked to contact damage and the onset of oxidative stress. Alongside specific histological staining, this condition is primarily demonstrated through biochemical, molecular, and metabolic investigations. Metabolomics, based on proton nuclear magnetic resonance (1H NMR), combined with chemometrics, made it possible to comprehensively explore the time-dependent metabolic disturbances triggered by MPs in the gonads of mussels during the short-term study. Ultimately, the dose-dependent stress condition caused by MPs also disrupts the proper chromatin folding of spermatozoa. This suggests that these particles, in addition to hindering gametogenesis, may also impact the fertilizing capacity of these cells.
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Polystyrene Microplastic Exposure Adversely Affects Oocyte Quality and Ovary Health Status in Mytilus galloprovincialis
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Scientists found that mussels exposed to tiny plastic beads (the same kind found in everyday plastic pollution) for just 48 hours showed damaged egg cells, stress responses, and disrupted metabolism in their reproductive organs. Since mussels are filter feeders often used to gauge ocean pollution levels—and are also a food source for humans—this research is a warning sign that microplastics may harm reproductive health in marine life, raising questions about what similar exposure could mean for other animals, including us, as plastic pollution continues to build up in the food chain.
Unveiling the impact of environmental microplastics on mussel spermatozoa: First evidence of prothymosin-α detection in invertebrate’s male gametes
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Researchers exposed mussel sperm cells to environmental microplastics collected from a Mediterranean beach and observed significant damage to their viability, motility, and DNA integrity. The study also provided the first-ever detection of the protein prothymosin-alpha in invertebrate sperm cells, showing it was affected by microplastic exposure. These findings suggest that microplastic pollution could threaten the reproductive capacity of mussels and potentially impact marine populations over time.
Environmental contamination with polystyrene micro and nano plastic affects Mytilus galloprovincialis ovaries
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Researchers exposed Mediterranean mussels (Mytilus galloprovincialis) to 5 µm microplastics and 0.1 µm nanoplastics and found that both triggered oxidative stress, disrupted cytoskeletal proteins, and impaired oocyte maturation, with nanoplastics causing more severe suppression of egg cell proliferation and higher rates of cell death — raising concerns for coastal mollusk reproductive health.
Polystyrene Nanoplastics in Aquatic Microenvironments Affect Sperm Metabolism and Fertilization of Mytilus galloprovincialis (Lamark, 1819)
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Researchers exposed mussel sperm to amino-modified polystyrene nanoplastics of different sizes and measured the effects on fertilization. The study found that 50-nanometer particles caused structural damage to sperm membranes, DNA damage, and reduced motility and fertilizing capacity, while 100-nanometer particles had no significant effect. These findings suggest that the smallest nanoplastic particles may pose the greatest threat to reproductive success in marine organisms.
Environmental microplastics compromise reproduction of the marine invertebrate Mytilus galloprovincialis: A holistic approach
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Exposing Mediterranean mussel (Mytilus galloprovincialis) gametes to 50 or 100 µg/L environmental microplastics for 1 hour reduced fertilization success, increased larval malformation rates, and caused DNA degradation, demonstrating reproductive toxicity from environmentally realistic MP concentrations.
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