We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Polystyrene nanoplastics promote tumor lung metastasis by inducing sodium overload in macrophages in an NMDAR-dependent way
Summary
New research in mice found that inhaling tiny nanoplastic particles can help breast cancer spread to the lungs more easily. The particles seem to do this by overloading immune cells called macrophages with sodium, causing them to swell and die, which triggers lung inflammation that makes it easier for cancer to take hold. While this study was done in mice, not humans, it adds to growing evidence that the nanoplastics we're constantly exposed to in daily life could have real effects on cancer progression, not just general health.
Micro- and nanoplastics (MNPs) are increasingly recognized as ubiquitous environmental pollutants; however, their role in tumor metastasis remains poorly understood. This study aimed to investigate the impact of polystyrene nanoplastics on breast cancer lung metastasis and to elucidate the underlying mechanisms. Using a mouse model of breast cancer, we demonstrated that inhalation of amino-modified polystyrene nanoplastics (NPS) significantly increased the number of metastatic nodules in the lungs. Mechanistically, NPS were found to bind integrins on the macrophage membrane and activated membrane-localized N-methyl-D-aspartate receptor (NMDAR), thereby inducing intracellular sodium overload. This process led to macrophage swelling, detachment, and subsequent pulmonary inflammation. Importantly, pharmacological inhibition or genetic knockdown of NMDARs effectively suppressed NPS-induced sodium influx and macrophage death, and markedly alleviated pulmonary inflammation in vivo. Collectively, these findings reveal that nanoplastics promote lung metastasis by disrupting cellular sodium homeostasis and thereby providing new insights into the potential health risks associated with nanoplastics exposure.