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Potential toxicity of polystyrene microplastic particles
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Researchers investigated the cellular-level toxicity of polystyrene microplastic particles and found that they stimulated immune responses in a size- and concentration-dependent manner. The particles triggered the production of cytokines and chemokines, which are signaling molecules involved in inflammation. The study challenges the common assumption that microplastics pose minimal risk to human health, suggesting they may have immunological effects upon direct contact with cells.
Environmental pollution arising from plastic waste is a major global concern. Plastic macroparticles, microparticles, and nanoparticles have the potential to affect marine ecosystems and human health. It is generally accepted that microplastic particles are not harmful or at best minimal to human health. However direct contact with microplastic particles may have possible adverse effect in cellular level. Primary polystyrene (PS) particles were the focus of this study, and we investigated the potential impacts of these microplastics on human health at the cellular level. We determined that PS particles were potential immune stimulants that induced cytokine and chemokine production in a size-dependent and concentration-dependent manner.
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Researchers tested the cytotoxicity of polystyrene microplastics on four human cell lines at concentrations relevant to real-world human exposure from food, water, and packaging. At environmentally realistic doses, microplastics were taken up by cells but did not cause significant toxicity, though higher concentrations did produce cell damage, suggesting that current exposure levels may be near a threshold of concern.
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Researchers exposed immune cells called macrophages to polystyrene microplastics and found that the cells rapidly absorbed the particles within two hours. Higher concentrations caused mitochondrial damage, disrupted cellular recycling processes, and triggered inflammation-related signaling. The study provides evidence that microplastics can impair the function of key immune cells responsible for defending the body against foreign threats.
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Researchers found that polystyrene microplastics taken up by macrophages — immune cells lining the gut and lungs — triggered a metabolic shift toward an inflammatory state. This finding suggests microplastics reaching human tissues may alter immune function in ways that could contribute to inflammation-related diseases.
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Researchers exposed human macrophage cells to polystyrene nanoparticles smaller than 450 nanometers and observed significant decreases in cell viability, increased oxidative stress, and DNA damage. The particles also reduced mitochondrial membrane potential and inhibited cell proliferation. The findings suggest that microplastic exposure may impair immune cell function in humans, highlighting potential risks to the immune system.
Role of Residual Monomers in the Manifestation of (Cyto)toxicity by Polystyrene Microplastic Model Particles
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Researchers investigated whether the toxicity observed in laboratory studies using polystyrene microplastic particles might actually come from leftover styrene monomer trapped in the particles rather than the plastic itself. They found that standard commercial polystyrene particles containing residual monomers showed mild toxicity to mammalian cells, while thoroughly purified particles did not. The study suggests that some reported toxic effects of microplastics in lab settings may be partly attributed to chemical residues rather than the plastic particles alone.
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