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Microplastics: First Proteomic Analysis on Kidney Tubular Cells
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Scientists exposed human kidney cells to microplastics and BPA (a chemical often found in plastics) and found that these substances changed the levels of several key proteins linked to cell stress, damage, and repair. This is early lab research, not proof of harm in real people yet, but it's one of the first studies to show microplastics may directly disrupt kidney cell function, suggesting we need more research into whether everyday plastic exposure could contribute to kidney disease.
Background: Microplastics (fragments < 5 mm in diameter) and nanoplastics (< 1 μm) are ubiquitous in the environment. Microplastics (MPs) absorb environmental pollutants, such as bisphenol A (BPA), and release them into tissues increasing their toxicity. Their presence has been proved in human blood and human tissues, such as placenta and lung, and in cirrhotic liver. Biological effects of MPs are inflammation, oxidative stress and alteration of metabolic pathways. We performed proteomic analysis to evaluate the toxicity of polyethylene (PE) and bisphenol-A (BPA) MPs on renal tubular cells (HK2). Methods: HK-2 cultures were exposed to BPA, PE Microspheres (PE-MP) and MP combined with BPA. We performed a proteomic analysis by mass spectrometry (MS). Analysis of data were performed using unsupervised hierarchical clustering using multidimensional scaling, non-linear support vector machine (SVM) learning, and partial least squares discriminant analysis. In SVM learning, a fourfold cross-validation approach was applied to estimate the prediction and classification accuracy. Results: Analysis showed a clear differentiation of the HK2 proteome based on conditioning and identified a “core” of proteins, significant at ANOVA and above the 95th percentile for “fold increase” and significant at T-test compared with controls, highly discriminatory between groups. A final set of 5 proteins was selected to be validated for distinguishing features. PPIAL4C accelerate the folding of proteins. Nephronectin is involved in cellular adhesion. GDF15 is a markers of stress conditions. IGFBP7 is a biomarker of acute kidney damage. CDKN1C is a negative regulator of cell proliferation. Conclusions: MP and BPA significantly modify the protein expression in renal tubular cells. These findings highlight the urgent need for additional research into the toxic effects of plastic debris on human kidneys and the eventual link to kidney diseases.Multidimensional scaling. Highly performance discrimination of all the experimental groups, different conditions and times compared with controls
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Microplastics and Bisphenol A Coexposure on Human Kidney Proximal Tubular Cells
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Scientists exposed human kidney cells in a lab dish to microplastics and BPA (a chemical found in plastics), both separately and together, to see how they affect kidney health. When combined, these two substances caused more cell damage, stress, and inflammation than either one alone, suggesting that everyday exposure to plastic-related chemicals might team up to harm our kidneys more than we'd expect from studying them individually. While this was a cell study (not in actual humans), it adds to growing evidence that plastic pollution in our bodies could have real consequences for organ health.
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Researchers are using genomics and proteomics to identify and engineer microbes and enzymes capable of breaking down microplastics in the environment, a field that holds promise for biological cleanup of plastic pollution. Understanding which genes and proteins drive plastic degradation could lead to targeted bioremediation strategies for soils and waterways contaminated with persistent plastic fragments.
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