Fumarate accumulation involved in renal diabetic fibrosis in Goto-Kakizaki rats

Yuri Miura, Atsuko Hayakawa, Shohei Kikuchi, Hiroki Tsumoto, Keitaro Umezawa, Yuko Chiba, Yurie Soejima, Motoji Sawabe, Koji Fukui, Yoshihiro Akimoto, Tamao Endo

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The Goto-Kakizaki (GK) rat is a spontaneous animal model of type 2 diabetes and early stage of diabetic nephropathy. However, the pathophysiological mechanisms contributing to the progression of diabetic nephropathy in GK rats remain unclear. Kidneys from 15-week old male diabetic GK/Jcl rats and age-matched Wistar rats, which have the same genetic background as GK rats, were used. Proteomic analyses of GK and Wistar kidneys were performed using two-dimensional fluorescence difference gel electrophoresis (2D-DIGE). Differentially expressed proteins in GK rats were subjected to pathway analysis, and expression levels of hypoxia inducible factor 1α (HIF-1α) and transforming growth factor-β1 (TGF-β1), and fumarate accumulation in GK kidneys were examined. Azan staining and immunohistochemical staining of α-smooth muscle actin were performed in relation to fibrosis in GK kidneys. Proteomic analysis using 2D-DIGE, analysis of fumarate content, and expression analysis of HIF-1α, TGF-β1, and α-smooth muscle actin of GK rat's kidney, suggested the mechanism of fibrosis characterized as two stages in diabetic nephropathy of GK rats. Abnormalities of glucose metabolism such as elevated levels of 2-oxoglutarate dehydrogenase and reduction of fumarate hydratase caused the accumulation of fumarate followed by the upregulation of HIF-1α and TGF-β1 leading to fibrosis in diabetic nephropathy. Alterations in proteins involved in the tricarboxylic acid cycle are associated with fibrosis through fumarate accumulation in diabetic nephropathy of GK rats.

元の言語English
記事番号108167
ジャーナルArchives of Biochemistry and Biophysics
678
DOI
出版物ステータスPublished - 2019 12 15

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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    Miura, Y., Hayakawa, A., Kikuchi, S., Tsumoto, H., Umezawa, K., Chiba, Y., Soejima, Y., Sawabe, M., Fukui, K., Akimoto, Y., & Endo, T. (2019). Fumarate accumulation involved in renal diabetic fibrosis in Goto-Kakizaki rats. Archives of Biochemistry and Biophysics, 678, [108167]. https://doi.org/10.1016/j.abb.2019.108167