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Tungsten toxicity on kidney tubular epithelial cells induces renal inflammation and M1-macrophage polarization

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Abstract

Tungsten is widely used in medical, industrial, and military applications. The environmental exposure to tungsten has increased over the past several years, and few studies have addressed its potential toxicity. In this study, we evaluated the effects of chronic oral tungsten exposure (100 ppm) on renal inflammation in male mice. We found that 30- or 90-day tungsten exposure led to the accumulation of LAMP1-positive lysosomes in renal tubular epithelial cells. In addition, the kidneys of mice exposed to tungsten showed interstitial infiltration of leukocytes, myeloid cells, and macrophages together with increased levels of proinflammatory cytokines and p50/p65-NFkB subunits. In proximal tubule epithelial cells (HK-2) in vitro, tungsten induced a similar inflammatory status characterized by increased mRNA levels of CSF1, IL34, CXCL2, and CXCL10 and NFkB activation. Moreover, tungsten exposure reduced HK-2 cell viability and enhanced reactive oxygen species generation. Conditioned media from HK-2 cells treated with tungsten induced an M1-proinflammatory polarization of RAW macrophages as evidenced by increased levels of iNOS and interleukin-6 and decreased levels of the M2-antiinflammatory marker CD206. These effects were not observed when RAW cells were exposed to conditioned media from HK-2 cells treated with tungsten and supplemented with the antioxidant N-acetylcysteine (NAC). Similarly, direct tungsten exposure induced M1-proinflammatory polarization of RAW cells that was prevented by NAC co-treatment. Altogether, our data suggest that prolonged tungsten exposure leads to oxidative injury in the kidney ultimately leading to chronic renal inflammation characterized by a proinflammatory status in kidney tubular epithelial cells and immune cell infiltration.

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All data supporting the findings of this study are available within the paper and its Supplementary Information.

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Acknowledgements

We thank Dr. Koren K. Mann for providing invaluable feedback and thoughtful discussions on the manuscript.

Funding

This work was supported by grants from the Canadian Institutes of Health Research (CIHR Project Grant #428250 to C. Gerarduzzi), the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery Grant #DGECR-2019-00141 to C. Gerarduzzi), Kidney Foundation of Canada (Kidney Health Research Grant #674586 to C.Gerarduzzi) and the Hôpital Maisonneuve-Rosemont Foundation (to C. Gerarduzzi). C. Gerarduzzi is a recipient of the Fonds de Recherche – Santé (Bourses de chercheurs-boursiers Junior 1 #298956) and the Support pour jeunes chercheur·euse·s: Mentorat et projet intercentre du réseau de recherche en santé Cardiométabolique, Diabète et Obésité (CMDO).

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Contributions

Study design and conduct: C.G. and J.B.C. Data collection: J.B.C., N.H., M.G., and S.C. Data analysis and interpretation: C.G., J.B.C., M.G., P.G., and V.P. Drafting manuscript: J.B.C. and M.G. Revising manuscript content and approving the final version of manuscript: all authors reviewed the manuscript.

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Correspondence to Casimiro Gerarduzzi.

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In vivo experiments were carried out according to the Canadian Council on Animal Care guidelines for the use of laboratory animals, under the supervision and approval of our local animal care committee (Comité de protection des animaux du Centre Intégré Universitaire de Santé et de Services Sociaux (CIUSSS) de l’Est-de-l’île-de-Montréal) with the approved protocol number 2018-1261, in compliance with the Animal Research: Reporting of in vivo Experiments (ARRIVE) Guidelines.

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The authors declare no competing interests.

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Barrera-Chimal, J., Henley, N., Grant, M. et al. Tungsten toxicity on kidney tubular epithelial cells induces renal inflammation and M1-macrophage polarization. Cell Biol Toxicol 39, 3061–3075 (2023). https://doi.org/10.1007/s10565-023-09817-6

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  • DOI: https://doi.org/10.1007/s10565-023-09817-6

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