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Nanoplastics disrupt thyroid hormone homeostasis and neurodevelopment in zebrafish: a systems-level assessment
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Tiny plastic particles (nanoplastics) fed to developing zebrafish embryos got absorbed into their bodies, disrupted thyroid hormone levels, and interfered with brain development—leading to problems like impaired eyesight, heart issues, and abnormal behavior. Even at very low doses (far below what you might expect matters), these effects showed up, and the researchers couldn't find a "safe" level where no harm occurred. Since zebrafish are a common stand-in for studying how chemicals affect early human development, this raises real concerns about whether the nanoplastics we're increasingly exposed to in food, water
Nanoplastics are increasingly detected in the environment, raising concerns about their endocrine disruption during vertebrate development. Here, zebrafish embryos were exposed from 0 to 120 hpf to environmentally informed concentrations of 30 nm polystyrene nanoplastics (PSNP; 0-3 mg/L) to assess internal burden, hypothalamus-pituitary-thyroid (HPT) axis disruption and neurodevelopmental outcomes in an intact early-life model. Time-lapse confocal imaging revealed rapid chorion-associated accumulation, progressive internalization and widespread distribution, with only partial clearance after depuration. Fluorescence/NTA-derived estimates confirmed concentration-dependent internal particle-equivalent burdens, with approximately 49% remaining after washout at 3 mg/L. PSNP exposure reduced whole-body TSH, T4, and T3 levels at 120 hpf, and altered thyroid-related transcription, including marked tshb downregulation and compensatory changes in genes involved in thyroid hormone synthesis, transport and metabolism. Neurodevelopmental genes related to oligodendrocyte lineage specification, myelination, synaptogenesis, and neuronal differentiation were also dysregulated, and embryos showed altered early motor output. At the organism level, PSNP induced multisystem developmental phenotypes, including reduced pigmentation, impaired eye and otolith development, swim bladder deflation, tachycardia, pericardial edema and stimulus-dependent locomotor and anxiety-like changes, some persisting after depuration. Effects were detected at the lowest tested concentration (LOAEL = 0.01 mg/L; 31,507 particle-equivalents/larva), with no NOAEL established. Eye-size reduction provided the most robust apical BMD fit (BMD 0.008 mg/L; BMDL 0.004 mg/L), corresponding to an exploratory internal bioactivity anchor of 25,206 and a conservative internal PoD of 12,603 particle-equivalents/larva. These findings link sustained internal PSNP exposure with multi-level HPT-axis disruption and endocrine-related developmental neurotoxicity, supporting their relevance for hazard and risk assessment of nanoplastics.
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Impacts of Environmental Concentrations of Nanoplastics on Zebrafish Neurobehavior and Reproductive Toxicity
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Researchers exposed zebrafish to environmentally realistic levels of polystyrene nanoplastics and found they caused both brain and reproductive damage. The nanoplastics disrupted neurotransmitter signaling and impaired the hormonal pathway connecting the brain to reproductive organs, with different effects in males and females. These findings suggest that even low-level nanoplastic exposure could affect both brain function and fertility in aquatic life that humans may consume.
Zebrafish embryos as a biological model to study the effects of nanoplastics
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This study used zebrafish embryos as a model system to investigate the toxic effects of nanoplastics, finding developmental disruptions at concentrations relevant to environmental exposure. Zebrafish embryos are a widely used model because their transparency allows direct visualization of organ development during toxicant exposure.
Nanoplastic Exposure Mediates Neurodevelopmental Toxicity by Activating the Oxidative Stress Response in Zebrafish (Danio rerio)
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Exposure to 20-nanometer plastic particles caused developmental problems in zebrafish embryos, including shorter body length, heart defects, and lower survival rates. The nanoplastics specifically damaged the development of motor neurons and triggered oxidative stress, a harmful chemical imbalance in cells. These results suggest that very small plastic particles could interfere with early brain and nerve development.
Early-life exposure to five biodegradable plastics impairs eye development and visually-mediated behavior through disturbing hypothalamus-pituitary-thyroid (HPT) axis in zebrafish larvae
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Zebrafish exposed to five types of biodegradable plastic microplastics during early development showed impaired eye growth, damaged retinas, and disrupted thyroid hormone signaling. Some plastics also caused abnormal visual behavior, suggesting actual vision loss. These findings are important because biodegradable plastics are marketed as safer alternatives, yet they may still harm developing organisms, including potentially affecting human fetal development.
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