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Polystyrene nanoplastics induce mitochondrial dysfunction and stress responses in human PBMCs
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Scientists exposed human immune cells to tiny plastic particles (like those found in our air, food, and water) and found that within just one hour, the plastics got inside the cells and started damaging their "power plants" (mitochondria), while also triggering stress signals inside the cells. This is early-stage lab research, not proof of harm in living people, but it suggests that everyday nanoplastic exposure could interfere with how our immune system functions—something worth watching as plastic pollution keeps increasing.
Plastics continuously fragment into micro- and nanoplastics (MPs/NPs), which are increasingly recognized as emerging environmental contaminants of global concern. Human exposure to nanoplastics through air, food, and water is becoming unavoidable; however, their direct effects on human immune cells remain poorly understood. Due to their small size, NPs can enter the circulation and directly interact with immune cells, yet their cellular effects in humans remain poorly understood. In this study, we investigated the impact of polystyrene NPs on human peripheral blood mononuclear cells (PBMCs) using an integrated approach that combined imaging, mitochondrial stress testing, basophil activation assays, and single-cell RNA sequencing. Confocal microscopy confirmed efficient cytoplasmic internalization of 25-nm NPs. Optical diffraction tomography revealed that even short-term (1 h) exposure induced pronounced biophysical remodeling, including reduced cell volume and dry mass alongside increased intracellular density and refractive index. Seahorse metabolic profiling demonstrated substantial suppression of mitochondrial respiration across major immune subsets, reflected in reduced basal and maximal respiration, ATP-linked oxygen consumption, and spare respiratory capacity. Basophil activation remained unaffected by NP exposure. Single-cell transcriptomics identified a distinct NP-induced "stress-cell" population, characterized by upregulation of heat-shock and proteostasis pathways and concomitant downregulation of mitochondrial-encoded transcripts. Together, these data show that NPs rapidly disrupt mitochondrial function and activate proteotoxic stress programs in human immune cells. By situating these mechanisms within the One Health framework (human, animal and the planet health), our findings highlight how environmental nanoplastic pollution may translate into immune dysregulation and inform integrated environmental-public health risk assessments.
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Scientists exposed human cells to tiny plastic particles (from common plastics like polystyrene, polypropylene, and PVC) and found they damage the cell's "power plants" (mitochondria), triggering stress, inflammation, and even changes in how mitochondrial genes are switched on or off. Different plastic types caused different kinds of damage, but all disrupted a key energy-producing process, suggesting nanoplastics may harm cells in ways that could affect long-term health. Since this was a lab study on cells rather than in people, more research is needed to confirm what this means for real-world plastic exposure in humans.
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Scientists exposed human liver cells to tiny plastic particles (nanoplastics) at levels that didn't kill the cells, but found the cells' "power plants" (mitochondria) were already struggling—burning less fuel and producing less energy—along with other changes in how the cells process fat and nutrients. This matters because it suggests nanoplastics, which have already been found in real human liver tissue, may quietly stress liver cells and disrupt their metabolism even before any visible damage occurs, raising questions about long-term effects of everyday plastic exposure on liver health.
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Human stem cells grown in a lab dish were exposed to tiny polystyrene plastic particles for 24 hours. The particles entered the cells, increased harmful molecules called reactive oxygen species, and disrupted the cells' mitochondria, the parts that produce energy, affecting their function and membrane health.
Polystyrene Nanoplastics Induce Early Mitochondrial Dysfunction in H9c2 Cardiomyoblasts Without Substantial Cell Damage
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Scientists exposed heart muscle cells to nanoplastics (tiny plastic particles similar to those found in human blood and heart tissue) and found that even without killing the cells or causing obvious damage, the plastics quietly disrupted the cells' mitochondria — the "power plants" that generate energy. This means the heart cells' ability to produce extra energy during stress or exertion may be weakened, even though everything looks normal on the surface. While this was a lab study on cells (not people), it raises concern that everyday plastic exposure could be subtly straining our hearts' energy reserves over time.
Polystyrene nanoplastics impair mitochondrial function, quality control, and ER–mitochondria crosstalk in HeLa cells
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Researchers exposed human HeLa cells (grown in the lab) to polystyrene nanoplastics and measured effects on mitochondria, the cell's energy-producing structures. The nanoplastics disrupted mitochondrial energy production, increased oxidative stress markers, and interfered with communication between mitochondria and another cell structure called the endoplasmic reticulum.
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