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Cellular responses to hypoxia after renal segmental infarction
Christian Rosenberger1, Wanja Griethe, Gertrud Gruber
1Department of Nephrology and Medical Intensive Care, Charité, Humboldt University, Berlin, Germany.
Kidney International
|August 13, 2003
Summary
Kidney cells adapt to low oxygen (hypoxia) by activating hypoxia-inducible factors (HIFs), promoting gene expression and proliferation, which may aid recovery from renal ischemia.
Area of Science:
- Nephrology
- Renal Pathophysiology
- Cellular Biology
Background:
- Hypoxia is implicated in kidney disease pathogenesis.
- Cellular responses to renal hypoxia are not well understood.
Purpose of the Study:
- To investigate the effects of regional hypoxia on kidney cells.
- To analyze adaptive responses to renal ischemia.
Main Methods:
- Induced renal infarcts in rats to create an oxygen gradient.
- Assessed cell morphology, hypoxia-inducible factors (HIFs), HIF target genes, and cell proliferation.
Main Results:
- Hypoxia induced tubular necrosis, with sparing around venous structures.
- HIF-1alpha and HIF-2alpha were upregulated in various renal cells.
- Upregulation of HIF target genes (heme oxygenase-1, VEGF) preceded capillary and tubular proliferation.
Conclusions:
- Renal tissue demonstrates significant adaptive potential to regional ischemia.
- Angiogenesis is a key adaptive response to renal hypoxia.