The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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Expression of Endothelin-1 and Its Receptors in Cisplatin-Induced Acute Renal Failure in Mice

  • Lee, Seok-Woo (Department of Physiology, Kosin University College of Medicine) ;
  • Ahn, Do-Whan (Department of Physiology, Kosin University College of Medicine)
  • Published : 2008.08.31
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Abstract

Endothelin-1 (ET-1) is unequivocally elevated in the kidney with ischemic acute renal failure (ARF), whereas ET receptors ($ET_AR$ and $ET_BR$) are variably expressed. Although renal functional and structural changes are similar between ischemic and nephrotoxic ARF, there are few reports on the alteration in the ET system in nephrotoxic ARF. This study was, therefore, undertaken to investigate changes in renal expression of ET-l and its receptors in nephrotoxic ARF induced by cisplatin. Mice were intraperitoneally injected with 16 mg of cisplatin/kg at a single dose, and the expression of mRNA and protein was then quantified by real-time RT-PCR and Western blot, respectively. Immunohistochemistry was conducted for localization. Three days after treatment, ET-1 transcript in cisplatin-treated mice was thirteen times higher than that in controls, whereas ET-1 peptide was increased by 1.5-fold. Cisplatin caused a 2-fold increase in the levels of ETAR mRNA and protein. Most of the increased immunoreactive ET-1 and ETAR were localized in damaged tubules. Neither the expression of ETBR mRNA nor the abundance and immunoreactive level of ETBR protein were changed. The findings suggest that the individual components of the renal ET system are differentially regulated in cisplatin-induced nephrotoxic ARF.

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References

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