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The Effects of Microplastics and Acetaminophen on Regeneration in the Planarian Dugesia
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Researchers exposed planarian flatworms to microplastics and acetaminophen to assess effects on nervous system regeneration, observing slowed blastema formation and increased premature death in microplastic-treated worms, suggesting both pollutants impair regenerative capacity in a widely used model organism for neurotoxicology.
Planarian flatworms are a good model system to investigate the effects of environmental pollutants on the nervous system because of their unique ability to regenerate it entire body from one segment. Microplastics have become a ubiquitous pollutant, so many questions have emerged regarding the effects of microplastics on public health. Additionally, acetaminophen use during pregnancy has been under scrutiny because of its potential negative effects upon fetal development. The goal of our study is to determine whether either microplastic exposure or acetaminophen exposure has any impact on planarian regeneration, specifically the nervous system. To test our hypotheses, we have been incubating flatworm segments in acetaminophen and microplastic solutions to observe changes in regeneration. We cut the flatworms in half and then tracked their regeneration after being incubated in acetaminophen concentrations of 0.1mM, 0.01mM and microplastic concentrations of 0.1 mg/L. While the acetaminophen flatworms are put into solution immediately after being divided, the worms in the microplastic solution are fed and pre-incubated in the 0.1 mg/L solution to accurately mimic an environmental exposure. We have observed acetaminophen exposure results in premature death compared to controls; we are continuing to work towards finding an acetaminophen solution concentration that has an effect on regeneration without killing the worms. The microplastic solution also has similar effects on regeneration and premature death compared to controls, and we have observed a slowed regeneration time and slowed blastema formation in worms that have survived. Additional work will need to be done to understand how these results can be used to indicate differences in nervous system regeneration. Both the effects acetaminophen and microplastic exposure to human heath and development is understudied and must be better understood to avoid potential negative health outcomes.
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Researchers exposed freshwater planarians to nanoplastics and found that even very low concentrations significantly reduced feeding rates. Higher concentrations also delayed the worms' ability to regenerate lost body parts, a key biological function for these organisms. The study suggests that nanoplastic pollution in freshwater environments may impair fundamental survival behaviors and biological processes in aquatic invertebrates.
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This study exposed planarians (Dugesia japonica) to polystyrene microplastics at 0.5, 5, and 20 µm sizes and found size-dependent toxicity affecting stem cells, nervous system function, and regenerative ability. Smaller particles caused greater harm, disrupting homeostasis and impairing the planarians' well-known regenerative capacity.
Advances in ecotoxicological research using planarians: a comprehensive review
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Scientists use tiny flatworms called planarians—famous for their ability to regrow body parts—to study how pollutants like pesticides, microplastics, and heavy metals damage living tissue. This review of existing research found that many different pollutants cause the same underlying problem: they trigger cellular stress that disrupts the worms' repair systems, which can impair healing, behavior, and reproduction. One particularly concerning finding is that microplastics can act like a "Trojan horse," carrying harmful metals into the body more easily—a reminder that combined pollution exposure (as we experience in everyday life) may be riskier than expos
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