Regulation of transforming growth factor β1-dependent aldose reductase expression by the Nrf2 signal pathway in human mesangial cells

Fei Wang, Fei Tian, Samantha A. Whitman, Donna Zhang, Toru Nishinaka, Nong Zhang, Tao Jiang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Aldose reductase (AR) is a key enzyme in the alternative glucose metabolism pathway, the polyol pathway. To date, AR is known to be involved in several secondary complications of diabetes and various kidney diseases. The goal of this study was to elucidate how the Nrf2-anti-oxidant response element (ARE) signal pathway plays a role in TGFβ1's regulation of AR expression in human renal mesangial cells (HRMCs). As an in vitro model system, HRMCs were used to investigate AR mRNA by qPCR, protein by Western blot and enzymatic activity by spectrophotometric assay. The ability of TGFβ1 to induce reactive oxygen species (ROS) in cells was measured by electron-spin resonance (ESR) trapping method. Reporter assays were used to test the activity of the AR promoter region, and ChIP was employed to test the direct binding of Nrf2 with the endogenous AR promoter. Treatment of HRMCs with TGFβ1 up-regulated the expression of AR mRNA, protein, and activity level. Additionally, TGFβ1 rapidly increased cellular ROS levels, which in turn activated the Nrf2-ARE pathway. Either inhibition of ROS production or knockdown of Nrf2 in HRMCs decreased the TGFβ1-induction of AR expression. Nrf2 regulated AR luciferase activity specifically via two AREs within the AR promoter, and bound directly to the endogenous AR promoter. Furthermore, the TGFβ1-mediated expression of AR required Nrf2 and was significantly abrogated in Nrf2-/- cells. These data show the regulation of AR by TGFβ1 is induced by TGFβ1 stimulation of ROS, which activates the Nrf2-ARE pathway allowing Nrf2 to directly increase AR expression in HRMCs.

Original languageEnglish (US)
Pages (from-to)774-781
Number of pages8
JournalEuropean Journal of Cell Biology
Volume91
Issue number10
DOIs
StatePublished - Oct 2012

Fingerprint

Aldehyde Reductase
Mesangial Cells
Transforming Growth Factors
Signal Transduction
Antioxidant Response Elements
Reactive Oxygen Species
Spin Trapping
Messenger RNA
Electron Spin Resonance Spectroscopy
Kidney Diseases
Diabetes Complications
Luciferases
Genetic Promoter Regions

Keywords

  • AR
  • Nrf2
  • ROS
  • TGFβ1

ASJC Scopus subject areas

  • Cell Biology
  • Histology
  • Pathology and Forensic Medicine

Cite this

Regulation of transforming growth factor β1-dependent aldose reductase expression by the Nrf2 signal pathway in human mesangial cells. / Wang, Fei; Tian, Fei; Whitman, Samantha A.; Zhang, Donna; Nishinaka, Toru; Zhang, Nong; Jiang, Tao.

In: European Journal of Cell Biology, Vol. 91, No. 10, 10.2012, p. 774-781.

Research output: Contribution to journalArticle

Wang, Fei ; Tian, Fei ; Whitman, Samantha A. ; Zhang, Donna ; Nishinaka, Toru ; Zhang, Nong ; Jiang, Tao. / Regulation of transforming growth factor β1-dependent aldose reductase expression by the Nrf2 signal pathway in human mesangial cells. In: European Journal of Cell Biology. 2012 ; Vol. 91, No. 10. pp. 774-781.
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