Abstract
Renal tubular cell injury induced by oxalate plays an important role in kidney stone formation. Water containing oxygen nano-bubbles (nanometer-sized bubbles generated from oxygen micro-bubbles; ONB) has anti-inflammatory effects. Therefore, we investigated the inhibitory effects of ONB water on kidney stone formation in ethylene glycol (EG)-treated rats. We divided 60 rats, aged 4 weeks, into 5 groups: control, the water-fed group; 100 % ONB, the 100 % ONB water-fed group; EG, the EG treated water-fed group; EG + 50 % ONB and EG + 100 % ONB, water containing EG and 50 % or 100 % ONB, respectively. Renal calcium oxalate (CaOx) deposition, urinary excretion of N-acetyl-β-d-glucosaminidase (NAG), and renal expression of inflammation-related proteins, oxidative stress biomarkers, and the crystal-binding molecule hyaluronic acid were compared among the 5 groups. In the control and 100 % ONB groups, no renal CaOx deposits were detected. In the EG + 50 % ONB and EG + 100 % ONB groups, ONB water significantly decreased renal CaOx deposits, urinary NAG excretion, and renal monocyte chemoattractant protein-1, osteopontin, and hyaluronic acid expression and increased renal superoxide dismutase-1 expression compared with the EG group. ONB water substantially affected kidney stone formation in the rat kidney by reducing renal tubular cell injury. ONB water is a potential prophylactic agent for kidney stones.
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Acknowledgments
We thank Yoshihiro Mano of the Hyperbaric Medical Center, Hospital of Medicine, Tokyo Medical and Dental University for providing ONB water and valuable comments and Masayoshi Takahashi of the National Institute of Advanced Industrial Science and Technology for providing valuable comments. This study was supported by grants-in-aid from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT/JSPSKAKENHI Grant Number 22791483 and 24659716 and 23592374).
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All the authors declared no competing interests.
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Hirose, Y., Yasui, T., Taguchi, K. et al. Oxygen nano-bubble water reduces calcium oxalate deposits and tubular cell injury in ethylene glycol-treated rat kidney. Urolithiasis 41, 279–294 (2013). https://doi.org/10.1007/s00240-013-0576-5
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DOI: https://doi.org/10.1007/s00240-013-0576-5