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Nanoplastics disrupt Thyroid Hormone Homeostasis and Neurodevelopment in Zebrafish: A Systems-Level Assessment
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Simulated Environmental Nanoplastics Induce Zebrafish Developmental Toxicity and Stress Response
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Scientists exposed zebrafish embryos to nanoplastics that were specially broken down to mimic how plastic actually degrades in oceans and rivers, and found they caused more harm than the lab-made plastic beads typically used in research, stunting growth, slowing hatching, and triggering stress hormone spikes even at very low doses. Because these effects showed up at concentrations similar to what's found in real water sources, the findings suggest current safety testing may be underestimating the risks nanoplastics pose to both aquatic life and, potentially, to people who drink that water or eat seafood from it.
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This review pulls together existing studies showing that tiny plastic particles (micro- and nanoplastics) can build up in fish, damaging their gut, gills, heart, brain, and immune system by causing inflammation and cellular stress. While this research was done in fish, it matters for us too, since these plastics are widespread in water and seafood, and fish share many biological similarities with humans, meaning our bodies could face similar risks from ongoing plastic exposure.
Bioaccumulation and Toxic Effects of Micro- and Nanoplastics in Zebrafish: A Critical Review
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Researchers comprehensively reviewed micro- and nanoplastic bioaccumulation and toxicity in zebrafish, finding that these particles accumulate in digestive organs, gills, liver, and brain, inducing oxidative stress, developmental delays, neurotoxicity, and transgenerational reproductive impairments that highlight broad ecological risks.
Ecotoxicity of microplastics and nanoplastics in endocrine systems: a systematic review
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Researchers reviewed 15 studies on microplastic and nanoplastic effects on endocrine systems in mice, zebrafish, trout, and human placental tissue, finding that polystyrene particles consistently cause oxidative stress leading to thyroid and reproductive hormone imbalances, ovarian dysfunction, and fertility impairment.
Toxicity and behavioral response of zebrafish exposed to combined microplastic and bisphenol analogues
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Co-exposure of zebrafish larvae to polystyrene microplastics combined with bisphenol A or F increased larval lethality by 7–51% compared to either pollutant alone, while also causing stronger behavioral effects including reduced movement and activity. This synergistic toxicity — not seen in embryos — highlights the danger of treating microplastics and chemical contaminants as independent hazards, since real-world exposures are always mixed.
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