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Up-regulation of the human serum and glucocorticoid-dependent kinase 1 in glomerulonephritis

B Friedrich1, S Wärntges, K Klingel

  • 1Department of Physiology, University of Tübingen, Germany.

Kidney & Blood Pressure Research
|November 19, 2002
PubMed

Insights

Glomerulonephritis increases transforming growth factor-beta (TGF-beta), which upregulates human serum and glucocorticoid-dependent kinase 1 (hSGK1) transcription in the kidneys. This study investigated hSGK1 regulation in kidney biopsies from patients with glomerulonephritis.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Genetics

Background:

  • Glomerulonephritis involves excessive transforming growth factor-beta (TGF-beta) production.
  • Human serum and glucocorticoid-dependent kinase 1 (hSGK1), a novel TGF-beta target, regulates Na+ transport.
  • Understanding hSGK1's role in glomerulonephritis is crucial for disease pathophysiology.

Purpose of the Study:

  • To investigate the transcriptional regulation of hSGK1 in glomerulonephritis.
  • To determine hSGK1 expression levels in kidney biopsies of patients with glomerulonephritis.

Main Methods:

  • In situ hybridization was performed on kidney biopsies from patients diagnosed with glomerulonephritis.
  • hSGK1 transcript levels were quantified in glomerular and distal nephron epithelial cells.

Main Results:

  • hSGK1 transcript levels were elevated in 7 out of 9 glomerulonephritis patients.
  • Glomerular hSGK1 transcripts showed moderate to strong enhancement.
  • Distal nephron epithelial cells exhibited markedly enhanced hSGK1 transcripts in 2 out of 9 patients.

Conclusions:

  • Glomerulonephritis induces transcriptional upregulation of hSGK1 in the glomeruli.
  • Epithelial hSGK1 transcription is also upregulated in some cases of glomerulonephritis.
  • TGF-beta-mediated hSGK1 regulation is implicated in glomerulonephritis pathogenesis.

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