Abstract
Perfluorooctanoic acid (PFOA), a widely used chemical substance, causes an increased risk of human type 2 diabetes (T2D), but its underlying mechanism is not well elucidated. The aim of the present study was to investigate whether PFOA regulates the functions of pancreatic β cells, which are specialized for the biosynthesis and secretion of insulin. The treatment of the mouse pancreatic β cell line (MIN6 cells) with PFOA caused a time- and dose-dependent inhibition of cell viability in CCK-8 assays. Annexin V/PI and TUNEL staining results confirmed that exposure to a high PFOA dose (500 μM) promoted apoptosis of β cells, while a low dose (300 μM) had no effects on β cell survival. PFOA treatment, even at a low dose, diminished glucose-stimulated insulin secretion (GSIS) in both primary islet perfusion and MIN6 cell experiments. RNA-sequencing data showed significantly increased expression of endoplasmic reticulum (ER) stress-associated genes, with tribbles homolog 3 (Trib3) ranking first among the altered genes. The activation of ER stress pathways was verified by qRT-PCR assays, and the ATF4/CHOP/TRIB3 pathway contributed to PFOA-induced β cell damage. The inhibition of TRIB3 expression significantly protected MIN6 cells from PFOA-induced GSIS defects and apoptosis by ameliorating ER stress. These findings reveal a link between ER stress and PFOA-induced β cell defects, opening up a new set of questions about the pathogenesis of T2D due to environmental chemicals.
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PFOA exposure results in pancreatic β cell apoptosis.
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PFOA treatment diminishes glucose-stimulated insulin secretion in β cells.
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PFOA activates endoplasmic reticulum stress and increases TRIB3 expression.
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Inhibition of TRIB3 expression ameliorates PFOA-caused β cell dysfunction and apoptosis.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by grants from the National Natural Science Foundation of China (81770773 to W. T.; 81870531 and 82070843 to Y-X. Z.), the Natural Science Foundation of Jiangsu Province (BK20171499), the Science and Technology Development Fund of Nanjing Medical University (NMUB2018172), and the Scientific Research Project of Jiangsu Health Vocational College (JKFY201809).
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X. H., investigation and writing — original draft. D. W., data curation and formal analysis. Y. X., validation. Y. Z., investigation. Y. S., methodology. X. C., resources. Y. Z., visualization and writing — reviewing and editing. W. T., conceptualization and project administration.
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He, X., Wu, D., Xu, Y. et al. Perfluorooctanoic acid promotes pancreatic β cell dysfunction and apoptosis through ER stress and the ATF4/CHOP/TRIB3 pathway. Environ Sci Pollut Res 29, 84532–84545 (2022). https://doi.org/10.1007/s11356-022-21188-9
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DOI: https://doi.org/10.1007/s11356-022-21188-9