ArticleNanomaterials (Basel, Switzerland)2026
Polystyrene Nanoplastics Increase Macrophage Bactericidal Activity Through a Mechanism Involving Reactive Oxygen Species and Itaconate.
Article in Nanomaterials (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Nanoplastics are persistent environmental pollutants with potential risks to human health. Due to their small size, nanoplastics are internalized by macrophages, potentially altering their function. In this study we found that, in macrophages, 50 nm polystyrene nanoplastics were predominantly present in endosomes, lysosomes, and in the endoplasmic reticulum. Internalization of polystyrene nanoplastics increased the bactericidal activity of macrophages, which was inhibited by the NADPH oxidase inhibitor diphenyleneiodonium. Consistently, measurements of cellular and mitochondrial reactive oxygen species by flow cytometry revealed that polystyrene nanoplastics induced reactive oxygen species production in macrophages. In contrast, internalization of polystyrene nanoplastics reduced the levels of nitric oxide released by macrophages in response to
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