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A heart-on-a-chip simultaneously monitoring mechanical and electrophysiologic signals reveals charge-dependent micro/nano plastic cardiotoxicity
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Scientists using a lab-made "heart-on-a-chip" found that tiny plastic particles (microplastics) can weaken heart cell function, and the particles' electrical charge matters a lot—positively charged plastic bits caused the most damage by disrupting calcium channels that help heart cells beat properly. This matters because microplastics are already being found in human blood and heart tissue, and this research suggests that not all plastic pollution poses equal risk—the charge on these particles, which can change as plastic breaks down in the environment, may be a key factor in how harmful they are to our hearts.
Environmental micro/nano plastics (MNPs) have recently been identified within the human circulation and myocardial tissues, yet the specific biophysical drivers of their toxicity remain poorly defined. While previous models have demonstrated general cardiotoxic effects, they typically utilize single-type particles that fail to account for the diverse surface charges acquired during environmental aging. Here, using a multimodal heart-on-a-chip platform, we show that the cardiotoxicity of polystyrene MNPs is strongly associated with their surface charge, with positive charged particles (pPS-MNPs) producing the most pronounced suppression of electromechanical function. Further, we observed that pPS-MNPs preferentially accumulate within cardiomyocytes and may physically interfere with L-type calcium channels (Cav1.2). This spatial association is consistent with the observed suppression of Ca transients and mitochondrial stress, and suggests a contribution of Cav1.2-associated Ca dysregulation to electromechanical impairment. Our findings, validated in a long-term rat exposure model, identify surface charge as a key determinant of MNP cardiotoxicity and highlight the necessity of charge-specific risk assessments for plastic pollution.
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Charge Matters, but So Does Species: Amphibian Early Development under Exposure to Clean Dialyzed Nanoplastics
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Scientists exposed frog embryos to tiny plastic particles (nanoplastics) with different electrical charges and found that both the charge and the dose affected how harmful they were—causing growth problems, developmental defects, and disrupted gene activity linked to energy production and cell structure. While this study was done in frogs, not humans, it matters because it shows nanoplastics can cause biological harm even at low, "sublethal" levels, and gives researchers a faster, more precise way to test how these increasingly common pollutants might affect development in humans and other animals.
Emerging cardiovascular risks of micro- and nanoplastics: toxic effects and mechanistic pathways
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Tiny plastic particles called micro- and nanoplastics are getting into our bodies through food, air, and skin contact, and researchers have found them building up in people's hearts and blood vessels. This review of existing studies shows these plastic bits may contribute to heart disease by causing inflammation and damaging cells in the cardiovascular system. While more research is needed, this suggests that plastic pollution isn't just an environmental problem—it could be directly harming our heart health.
Charge Matters,but So Does Species: Amphibian EarlyDevelopment under Exposure to Clean Dialyzed Nanoplastics
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Scientists exposed developing frog embryos to tiny plastic particles (nanoplastics) with different electrical charges and found that both the charge and the amount mattered a lot: some particles caused higher death rates, while others caused body deformities and disrupted genes involved in energy production and cell structure. While this study was done in frogs, not humans, it adds to growing evidence that nanoplastics—which are increasingly found in water, food, and even human blood—can interfere with healthy development at the cellular level, underscoring why researchers are working to understand these tiny, hard-to-detect pollutants before they become a bigger health concern.
Micro- and nanoplastic as new modifiable cardiovascular risk factors
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Tiny plastic particles from everyday pollution, called microplastics and nanoplastics, may be quietly harming your heart, according to this review that pulls together over a decade of research. Scientists found these particles can disrupt cholesterol processing, make blood more likely to clot, and directly damage heart cells, partly by causing inflammation and stress inside cells. While more research is needed to fully understand the risks, this adds plastic pollution to the growing list of factors, alongside diet and exercise, that may affect your cardiovascular health.
Toxicity of long term exposure to low dose polystyrene microplastics and nanoplastics in human iPSC-derived cardiomyocytes
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Researchers exposed human heart cells grown from stem cells to very low doses of polystyrene micro- and nanoplastics over an extended period and found that the particles reduced the cells' ability to contract and disrupted their electrical signaling. The smaller nanoplastics (50 nm) caused more severe damage than the larger microplastics (1 micrometer), including increased cell death and calcium handling problems. This study provides direct evidence that even low-level microplastic exposure could harm human heart function.
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