Hydration status affects osteopontin expression in the rat kidney

Su Youn Lee, Sae Jin Lee, Hong Lin Piao, Suk Young Yang, I. David Weiner, Jin Kim, Ki Hwan Han

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Osteopontin (OPN) is a secretory protein that plays an important role in urinary stone formation. Hydration status is associated with the development of urolithiasis. This study was conducted to examine the effects of dehydration and hydration on OPN expression in the rat kidney. Animals were divided into three groups, control, dehydrated, and hydrated. Kidney tissues were processed for light and electron microscope immunocytochemistry, in situ hybridization, and immunoblot analysis. Dehydration induced a significant increase in OPN protein expression, whereas increased fluid intake induced a decrease in protein expression. Under control conditions, OPN protein and mRNA expression were only detected in the descending thin limb (DTL). Dehydration induced increased expression in the DTL and the development of detectable expression in the thick ascending limb (TAL). In contrast, OPN expression levels declined to less than the controls in the DTL after hydration, while no expression of either protein or mRNA was detectable in the TAL. Immunoelectron microscopy demonstrated that hydration status altered tubular ultrastructure and intracellular OPN expression in the Golgi apparatus and secretory cytoplasmic vesicles. These data confirm that changes in oral fluid intake can regulate renal tubular epithelial cell OPN expression.

Original languageEnglish
Pages (from-to)269-277
Number of pages9
JournalJournal of Veterinary Science
Issue number3
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© 2016 The Korean Society of Veterinary Science.


  • Hydration
  • Osteopontin
  • Renal stone
  • Tubular epithelial cells


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