Nephrol Dial Transplant (2000) 15: 1773-1781
© 2000 European Renal Association-European Dialysis and Transplant Association
An oral sorbent reduces overload of indoxyl sulphate and gene expression of TGF-ß1 in uraemic rat kidneys
1 Nagoya University Daiko Medical Center, 1-1-20, Daiko-minami, Higashi-ku, Nagoya, 2 Kureha Chemical Industry, Tokyo, and 3 Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan
Background. An oral adsorbent (AST-120) delays the progression of chronic renal failure (CRF). The aims of the present study are to determine the effects of AST-120 on the localization of indoxyl sulphate in uraemic rat kidneys, and to examine whether AST-120 reduces the renal cortical gene expression of transforming growth factor (TGF)-ß1, tissue inhibitor of metalloproteinase (TIMP)-1 and pro-
1(I)collagen, and ameliorates glomerular and tubulointerstitial injuries in uraemic rats.
Methods. Two weeks after 5/6-nephrectomy, 10 rats were divided into pairs such that both rats in each pair exhibited almost the same levels of serum creatinine, blood urea nitrogen and creatinine clearance. One rat from each pair was assigned to a control uraemic group, the other to a uraemic group which received AST-120 everyday for 11 weeks. The localization of indoxyl sulphate was studied by immunohistochemistry using a monoclonal anti-indoxyl sulphate antibody we had developed. The renal cortical gene expression was studied by using northern blotting.
Results. Rats treated with AST-120 showed decreased levels of serum creatinine, blood urea nitrogen and urinary protein as well as increased levels of creatinine clearance as compared with control uraemic rats. AST-120 markedly decreased indoxyl sulphate levels in both serum and urine. Immunohistochemistry demonstrated that indoxyl sulphate was localized in the renal proximal tubular epithelial cells, especially of dilated tubules, and that AST-120 markedly reduced the tubular staining of indoxyl sulphate. AST-120 attenuated interstitial fibrosis, tubular injury as well as glomerular sclerosis, and reduced the renal gene expression of TGF-ß1, TIMP-1 and pro-1(I)collagen.
Conclusions. AST-120 reduces the gene expression of TGF-ß1, TIMP-1 and pro-1(I)collagen in the kidneys, and delays the progression of CRF, at least in part, by alleviating the overload of indoxyl sulphate on remnant proximal tubular epithelial cells.
Keywords: chronic renal failure; indoxyl sulphate; oral sorbent; progression; TGF-ß
Correspondence and offprint requests to: Toshimitsu Niwa, Nagoya University Daiko Medical Center, 1-1-20, Daiko-minami, Higashi-ku, Nagoya 461-0047, Japan.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  A. Adijiang, S. Goto, S. Uramoto, F. Nishijima, and T. Niwa Indoxyl sulphate promotes aortic calcification with expression of osteoblast-specific proteins in hypertensive rats Nephrol. Dial. Transplant., June 1, 2008; 23(6): 1892 - 1901. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 H. Y. Li, F. F. Hou, X. Zhang, P. Y. Chen, S. X. Liu, J. X. Feng, Z. Q. Liu, Y. X. Shan, G. B. Wang, Z. M. Zhou, et al. Advanced Oxidation Protein Products Accelerate Renal Fibrosis in a Remnant Kidney Model J. Am. Soc. Nephrol., February 1, 2007; 18(2): 528 - 538. [Abstract] [Full Text] [PDF]
|
|