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Elevated PMMA levels in dental clinic wastewater induce retinal developmental toxicity in zebrafish by disrupting dhrs9-mediated retinol metabolism
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Dental clinics routinely release tiny plastic particles (PMMA, a common material in dentures and fillings) into wastewater, and this study found that in zebrafish, the smallest of these particles can damage developing eyes by disrupting a gene needed for normal vitamin A processing in the retina. While this research was done in fish, not humans, it highlights an overlooked source of microplastic pollution and raises questions about how these particles might affect eye development in other animals exposed to contaminated water. More research is needed to know if similar risks apply to humans, but it's a reminder that everyday medical and dental procedures can be an underappreci
Dental clinic wastewater has emerged as a significant yet understudied source of microplastic pollution, yet its ecotoxicological risks to aquatic organisms remain poorly characterized. Polymethyl methacrylate (PMMA), the primary matrix material of dental restorative and prosthetic materials, is ubiquitously released during clinical procedures. This study characterized microplastic contamination in wastewater samples from five randomly selected dental clinics and found that PMMA accounted for 12.07% of total detected microplastics and was present in all samples, confirming its status as a ubiquitous dental-derived microplastic pollutant. Subsequently, we evaluated the toxic effects of micron- and nanoscale PMMA (PMMA-MNPs) on zebrafish larvae, revealing that nanoscale PMMA (PMMA-NPs) exhibited significantly greater developmental toxicity than micron-sized particles. Exposure to PMMA-NPs induced concentration-dependent growth retardation, locomotor dysfunction, and ocular developmental defects, including reduced eye area, impaired ocular angiogenesis, and extensive retinal cell apoptosis. Transcriptomic sequencing identified the retinol metabolism pathway as the core dysregulated pathway underlying PMMA-NPs-induced ocular toxicity, with dhrs9 identified as a critical functional mediator. In vivo functional validation using dhrs9 knockdown and mRNA rescue assays demonstrated that dhrs9 deficiency recapitulated PMMA-NPs-induced retinal structural damage and apoptosis, while exogenous dhrs9 mRNA supplementation effectively reversed these toxic effects. Our findings reveal that dental-derived PMMA-NPs induce retinal developmental toxicity in zebrafish by inhibiting dhrs9 expression and disrupting retinol metabolism homeostasis. This study provides the first mechanistic evidence in zebrafish linking dental microplastic exposure to visual system damage in aquatic organisms, offering critical baseline data for the ecological risk assessment and discharge control of dental-source microplastics.
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Researchers exposed zebrafish embryos to PET plastic micro and nanoparticles at levels found in the environment and observed toxic effects including reduced tail movement, faster heart rates, and changes in eye development. The smaller nanoplastic particles were especially concerning because they are more easily absorbed by developing organisms. These findings suggest that PET plastic pollution in water could harm fish development, raising questions about effects on other species exposed through contaminated water.
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Scientists exposed baby zebrafish to tiny plastic particles (nanoplastics) and found they disrupted normal bone and skull development—in ways strikingly similar to a known hormone-disrupting chemical found in birth control pills. This matters because it suggests nanoplastics, which are increasingly found in water, food, and even human blood, could potentially interfere with healthy development by acting like an endocrine disruptor. While this study was done in fish, not humans, it raises important questions about how the growing amount of plastic pollution in our environment might affect bone health, especially during early development.
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