Reactive oxygen species in the presence of high glucose alter ureteric bud morphogenesis

Shao Ling Zhang, Yun Wen Chen, Stella Tran, Isabelle Chenier, Marie Josée Hébert, Julie R. Ingelfinger

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25 Citations (Scopus)


Renal malformations are a major cause of childhood renal failure. During the development of the kidney, ureteric bud (UB) branching morphogenesis is critical for normal nephrogenesis. These studies investigated whether renal UB branching morphogenesis is altered by a high ambient glucose environment and studied underlying mechanism(s). Kidney explants that were isolated from different periods of gestation (embryonic days 12 to 18) from Hoxb7-green fluorescence protein mice were cultured for 24 h in either normal D-glucose (5 mM) or high D-glucose (25 mM) medium with or without various inhibitors. Alterations in renal morphogenesis were assessed by fluorescence microscopy. Paired-homeobox 2 (Pax-2) gene expression was determined by real-time quantitative PCR, Western blotting, and immunohistology. The results revealed that high D-glucose (25 mM) specifically stimulates UB branching morphogenesis via Pax-2 gene expression, whereas other glucose analogs, such as D-mannitol, L-glucose, and 2-deoxy-D-glucose, had no effect. The stimulatory effect of high glucose on UB branching was blocked in the presence of catalase and inhibitors of NADPH oxidase, mitochondrial electron transport chain complex I, and Akt signaling. Moreover, in in vivo studies, it seems that high glucose induces, via Pax-2 (mainly localized in UB), acceleration of UB branching but not nephron formation. Taken together, these data demonstrate that high glucose alters UB branching morphogenesis. This occurs, at least in part, via reactive oxygen species generation, activation of Akt signaling, and upregulation of Pax-2 gene expression.

Original languageEnglish
Pages (from-to)2105-2115
Number of pages11
JournalJournal of the American Society of Nephrology
Issue number7
Publication statusPublished - 2007 Jul

All Science Journal Classification (ASJC) codes

  • Nephrology


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