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Assessing the NLRP3 Inflammasome Activating Potential of a Large Panel of Micro- and Nanoplastics in THP-1 Cells
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Researchers developed an in vitro screening system using immune cells to assess whether various micro- and nanoplastics can activate the NLRP3 inflammasome, a key component of the innate immune system involved in inflammatory responses. The study tested a large panel of plastic particles of different sizes, shapes, and polymer types, providing insights into which characteristics may trigger inflammatory responses.
Due to the ubiquity of environmental micro- and nanoplastics (MNPs), inhalation and ingestion by humans is very likely, but human health effects remain largely unknown. The NLRP3 inflammasome is a key player of the innate immune system and is involved in responses towards foreign particulate matter and the development of chronic intestinal and respiratory inflammatory diseases. We established NLRP3-proficient and -deficient THP-1 cells as an alternative in vitro screening tool to assess the potential of MNPs to activate the NLRP3 inflammasome. By investigating cytokine release (IL-1β and IL-8) and cytotoxicity after treatment with engineered nanomaterials, this in vitro approach was compared to earlier published ex vivo murine bone marrow-derived macrophages and in vivo data. This approach showed a strong correlation with previously published data, verifying that THP-1 cells are a suitable model to investigate NLRP3 inflammasome activation. We then investigated the proinflammatory potential of eight MNPs of different size, shape, and chemical composition. Only amine-modified polystyrene (PS-NH2) acted as a direct NLRP3 activator. However, polyethylene terephthalate (PET), polyacrylonitrile (PAN), and nylon (PA6) induced a significant increase in IL-8 release in NLRP3-/- cells. Our results suggest that most MNPs are not direct activators of the NLRP3 inflammasome, but specific MNP types might still possess pro-inflammatory potential via other pathways.
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This review examined how micro- and nano-plastics trigger inflammatory responses through interactions with immune cells, finding that particles activate multiple signaling pathways including NF-kB and NLRP3 inflammasome, potentially contributing to chronic low-grade inflammation linked to cardiovascular disease, autoimmune disorders, and cancer.
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When your body encounters tiny particles—like asbestos, quartz dust, or even microplastics—it can trigger an internal "alarm system" (called the NLRP3 inflammasome) that causes inflammation, which over time may contribute to disease. This review pulls together decades of research showing this link is well-proven for workplace dusts, but says scientists still don't fully know how risky everyday exposure to things like microplastics or air pollution really is. The authors argue that testing new materials for this inflammation trigger should become a standard safety check before they end up in products or the environment.
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