Calponin Expression in Renal Tubulointerstitial Fibrosis Induced in Rats by Cisplatin

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  • Yuasa Takahiro
    Laboratory of Veterinary Pathology, Life and Environmental Sciences, Osaka Prefecture University
  • Yano Ryo
    Laboratory of Veterinary Pathology, Life and Environmental Sciences, Osaka Prefecture University
  • Izawa Takeshi
    Laboratory of Veterinary Pathology, Life and Environmental Sciences, Osaka Prefecture University
  • Kuwamura Mitsuru
    Laboratory of Veterinary Pathology, Life and Environmental Sciences, Osaka Prefecture University
  • Yamate Jyoji
    Laboratory of Veterinary Pathology, Life and Environmental Sciences, Osaka Prefecture University

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Renal tubulointerstitial fibrosis is the common feature of chronic renal failure, regardless of its etiology. Myofibroblasts play important roles in progression of the fibrosis and are characterized by expressions of various cytoskeletons such as vimentin, desmin and α-smooth muscle actin (α-SMA). To pursue the characteristics of the cells, we immunohistochemically investigated the relationship between calponin (a marker of terminal smooth muscles) expression and myofibroblasts in cisplatin-induced rat renal tubulointerstitial fibrosis. Calponin-expressing interstitial cells increased with fibrosis and reacted simultaneously to vimentin or α-SMA (a marker of well-differentiated myofibroblasts) but not desmin or Thy-1 (a marker of myofibroblasts at the early stage). The present study shows that calponin may be expressed transiently in relatively well-developed myofibroblasts in rat renal fibrosis. Calponin could become a marker for myofibroblast development in chronic renal toxicity in rats.

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