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Modeling Hypoxia/Reoxygenation Injury in Proximal Tubular Epithelial Cells
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The serum and glucocorticoid-regulated kinase 1 in hypoxic renal injury

Krisztina Rusai1, Bettina Wagner, Marcel Roos

  • 1First Department of Pediatrics, Semmelweis University, Budapest, Hungary.

Cellular Physiology and Biochemistry : International Journal of Experimental Cellular Physiology, Biochemistry, and Pharmacology
|November 14, 2009
PubMed

Insights

Serum- and glucocorticoid-inducible kinase 1 (SGK1) protects against cell death. This study found SGK1 counteracts apoptosis during kidney hypoxia and ischemia, highlighting its protective role in renal injury.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Renal Physiology

Background:

  • Serum- and glucocorticoid-inducible kinase 1 (SGK1) is a kinase activated by the PI3-kinase pathway.
  • SGK1 activation and expression increase under cellular stress conditions.
  • SGK1 is known to counteract apoptosis.

Purpose of the Study:

  • To investigate the role of SGK1 in apoptosis induced by renal hypoxia/ischemia.
  • To determine if SGK1 expression and activation are altered during renal ischemia-reperfusion injury.

Main Methods:

  • In vitro experiments using HEK 293 cells exposed to hypoxia/reoxygenation (H/R).
  • In vivo studies utilizing gene-targeted mice lacking SGK1 subjected to renal ischemia/reperfusion (I/R).
  • Analysis of SGK1 transcript levels, protein abundance, phosphorylation, and apoptosis rates.

Main Results:

  • In vitro H/R increased SGK1 transcript, protein levels, and phosphorylation in HEK 293 cells.
  • Overexpression of SGK1 significantly reduced apoptosis in cells exposed to H/R.
  • In vivo I/R injury elevated SGK1 transcript and protein levels in the kidney.
  • Apoptosis following I/R was significantly exacerbated in mice lacking SGK1.

Conclusions:

  • SGK1 is upregulated in response to both in vitro and in vivo renal ischemia.
  • SGK1 plays a crucial protective role by counteracting apoptosis during renal hypoxic/ischemic injury.

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