Abstract
Environmental chemicals such as inorganic arsenic (iAs) significantly contribute to redox toxicity in the human body by enhancing oxidative stress. Imbalanced oxidative stress rapidly interferes with gut homeostasis and affects variety of cellular processes such as proliferation, apoptosis, and maintenance of intestinal barrier integrity. It has been shown that gut microbiota are essential to protect against iAs3+-induced toxicity. However, the effect of microbial metabolites on iAs3+-induced toxicity and loss of gut barrier integrity has not been investigated. The objectives of the study are to investigate impact of iAs on gut barrier function and determine benefits of gut microbial metabolite, urolithin A (UroA) against iAs3+-induced adversaries on gut epithelium. We have utilized both colon epithelial cells and in a human intestinal 3D organoid model system to investigate iAs3+-induced cell toxicity, oxidative stress, and gut barrier dysfunction in the presence or absence of UroA. Here, we report that treatment with UroA attenuated iAs3+-induced cell toxicity, apoptosis, and oxidative stress in colon epithelial cells. Moreover, our data suggest that UroA significantly reduces iAs3+-induced gut barrier permeability and inflammatory markers in both colon epithelial cells and in a human intestinal 3D organoid model system. Mechanistically, UroA protected against iAs3+-induced disruption of tight junctional proteins in intestinal epithelial cells through blockade of oxidative stress and markers of inflammation. Taken together, our studies for the first time suggest that microbial metabolites such as UroA can potentially be used to protect against environmental hazards by reducing intestinal oxidative stress and by enhancing gut barrier function.
Highlights
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The gut microbial metabolite Urolithin A (UroA) enhances cell viability during inorganic arsenic (iAs3+) exposure and prevents arsenite-induced cell death in colon epithelial cells.
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UroA reduced iAs3+-induced oxidative stress in intestinal epithelial cells.
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UroA alleviated iAs3+-induced barrier dysfunction in both colon epithelial cell monolayers and a human 3D small intestinal tissue model.
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The protective effect of UroA is associated with enhanced accumulation of tight junctional proteins including Zonula occludens-1, Occludin, and Claudin-4 to repair iAs3+-induced intestinal barrier damage.
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Acknowledgements
VRJ is supported by NIH/NCI (CA191683), NIH/NIGMS CoBRE Grant (P20GM125504-01), P30ES030283 (NIH/NIEHS), The Jewish Heritage Fund for Excellence Research Enhancement Grant, and JGBCC. The authors thank Dr. F.M. Ausubel for proof reading the manuscript and for insightful discussions. The authors thank Dr. Xu Jason from Integrated Toxicomics and Environmental Measurement Facility Core (ITEMFC), U of L for determining intra-cellular arsenic levels in cell lysates.
Funding
VRJ is supported by NIH/NCI (CA191683), NIH/NIGMS CoBRE Grant (P20GM125504-01), P30ES030283 (NIH/NIEHS), The Jewish Heritage Fund for Excellence Research Enhancement Grant, and UofL Health-BCC.
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VRJ is one of the scientific co-founders of Artus Therapeutics. SG, MB, and BH have no conflicts of interest to declare.
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Ghosh, S., Banerjee, M., Haribabu, B. et al. Urolithin A attenuates arsenic-induced gut barrier dysfunction. Arch Toxicol 96, 987–1007 (2022). https://doi.org/10.1007/s00204-022-03232-2
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DOI: https://doi.org/10.1007/s00204-022-03232-2