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Cystine crystal-induced reactive oxygen species associated with NLRP3 inflammasome activation: implications for the pathogenesis of cystine calculi

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Abstract

Purpose

To investigate whether cystine crystal-induced production of reactive oxygen species (ROS) and activation of NLRP3 inflammasome contribute to cystine calculi formation.

Methods

Slc7a9-knockout rats were created as cystine calculi animal models. Kidney histological examination using TEM and immunohistochemistry were performed. The protein expression of NLRP3 and IL-1β and the concentrations of oxidative stress markers such as ROS, MDA and H2O2 in kidney tissues were estimated. In parallel, HK-2 human renal proximal tubule cells were exposed to cystine crystals and NAC treatment. The protein and mRNA expression levels of NLRP3 were evaluated. Finally, cell apoptosis and cystine crystal adherence were also assessed.

Results

Activation of the NLRP3 inflammasome and marked elevations in MDA, H2O2 and ROS levels were observed both in vivo and in vitro. In particular, the protein and mRNA expression of NLRP3 was significantly increased by cystine crystals, but could be restored by an inhibitor of ROS. In addition, cell apoptosis and cystine crystal adherence were promoted by the NLRP3 inflammasome. The expression of CD44, OPN and HA in HK-2 cells was markedly increased by cystine crystals, but could be decreased by NLRP3 siRNA treatment.

Conclusion

Notably, we found that the activation of NLRP3 by cystine crystal-induced ROS production was of major importance in the pathogenesis of cystine calculi formation.

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Data availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This work was supported by grants from the National Natural Science Foundation of China (NSFC) (Grant Numbers 81570613 and 81370853), Medical research project of Jiangsu Commission of Health (Grant Numbers Z2021074) and Xinghuo Talent Program of Nanjing First Hospital.

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Authors and Affiliations

Authors

Contributions

ZYF, SLM and CW were responsible for the conception and design, collection and/or assembly of data, manuscript writing, and final approval of the manuscript. XLW was responsible for the data analysis, manuscript writing and final approval of the manuscript. XZ performed the experiments and data collection. JRP was responsible for the conception and design, manuscript correction, financial and administrative support, and final approval of the manuscript. ZY, SL and CW are co-first authors.

Corresponding author

Correspondence to Jia Ruipeng.

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Yifan, Z., Luming, S., Wei, C. et al. Cystine crystal-induced reactive oxygen species associated with NLRP3 inflammasome activation: implications for the pathogenesis of cystine calculi. Int Urol Nephrol 54, 3097–3106 (2022). https://doi.org/10.1007/s11255-022-03347-6

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