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Osteopontin knockdown in the kidneys of hyperoxaluric rats leads to reduction in renal calcium oxalate crystal deposition

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Abstract

Osteopontin (OPN) expression is increased in kidneys of rats with ethylene glycol (EG) induced hyperoxaluria and calcium oxalate (CaOx) nephrolithiasis. The aim of this study is to clarify the effect of OPN knockdown by in vivo transfection of OPN siRNA on deposition of CaOx crystals in the kidneys. Hyperoxaluria was induced in 6-week-old male Sprague–Dawley rats by administering 1.5 % EG in drinking water for 2 weeks. Four groups of six rats each were studied: Group A, untreated animals (tap water); Group B, administering 1.5 % EG; Group C, 1.5 % EG with in vivo transfection of OPN siRNA; Group D, 1.5 % EG with in vivo transfection of negative control siRNA. OPN siRNA transfections were performed on day 1 and 8 by renal sub-capsular injection. Rats were killed at day 15 and kidneys were removed. Extent of crystal deposition was determined by measuring renal calcium concentrations and counting renal crystal deposits. OPN siRNA transfection resulted in significant reduction in expression of OPN mRNA as well as protein in group C compared to group B. Reduction in OPN expression was associated with significant decrease in crystal deposition in group C compared to group B. Specific suppression of OPN mRNA expression in kidneys of hyperoxaluric rats leads to a decrease in OPN production and simultaneously inhibits renal crystal deposition.

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Acknowledgments

This work was supported in part by research grants “kidney disease” from the Osaka Kidney Bank. Dr. Khan’s research is supported by National Institute of Health grant # RO1-DK 078602.

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Authors and Affiliations

  1. Department of Urology, Kinki University Faculty of Medicine, 377-2 Ohnohigashi, Osakasayama, Osaka, 589-8511, Japan

    Hidenori Tsuji, Nobutaka Shimizu, Masahiro Nozawa, Tohru Umekawa, Kazuhiro Yoshimura, Marco A. De Velasco & Hirotsugu Uemura

  2. Department of Pathology and Laboratory Medicine, College of Medicine, University of Florida, Gainesville, FL, USA

    Saeed R. Khan

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  1. Hidenori Tsuji
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  2. Nobutaka Shimizu
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Correspondence to Hidenori Tsuji.

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Tsuji, H., Shimizu, N., Nozawa, M. et al. Osteopontin knockdown in the kidneys of hyperoxaluric rats leads to reduction in renal calcium oxalate crystal deposition. Urolithiasis 42, 195–202 (2014). https://doi.org/10.1007/s00240-014-0649-0

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  • DOI: https://doi.org/10.1007/s00240-014-0649-0

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