Angiotensin II stimulates hypoxia-inducible factor 1α accumulation in glomerular mesangial cells

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Abstract

Hypoxia increases hypoxia-inducible factor 1α (HIF-1α) protein levels by inhibiting ubiquitination and degradation of HIF-1α, which regulates the transcription of many genes. Recent studies have revealed that many ligands can stimulate HIF-1α accumulation under nonhypoxic conditions. In this study, we show that angiotensin II (Ang II) increased HIF-1α protein levels in a time- and dose-dependent manner under normoxic conditions. Treatment of mesangial cells with Ang II (100 nM) increased production of reactive oxygen species (ROS). Ang II (100 nM) increased the phosphorylation of PDK-1 and Akt/PKB in glomerular mesangial cells. Ang II-stimulated HIF-1α accumulation was blocked by the phosphatidylinositol 3-kinase (PI-3K) inhibitors, Ly 294001, and wortmannin, suggesting that PI-3K was involved. Because increased ROS generation by Ang II may activate the PI-3K-PKB/Akt signaling pathway, these results suggest that Ang II may stimulate a ROS-dependent activation of the PI-3K-PKB/Akt pathway, which leads to HIF-1α accumulation.

Original languageEnglish
Pages (from-to)286-293
Number of pages8
JournalAnnals of the New York Academy of Sciences
Volume1042
DOIs
Publication statusPublished - 2005

Fingerprint

Hypoxia-Inducible Factor 1
Mesangial Cells
Angiotensin II
Phosphatidylinositol 3-Kinase
Reactive Oxygen Species
Phosphorylation
Ubiquitination
Transcription
Oxygen
Cells
Proteins
Genes
Chemical activation
Ligands
Degradation
Protein
Pathway

Keywords

  • Akt
  • Angiotensin II
  • Hypoxia-inducible factor 1
  • Phosphatidylinositol 3-kinase
  • Reactive oxygen species

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • History and Philosophy of Science

Cite this

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abstract = "Hypoxia increases hypoxia-inducible factor 1α (HIF-1α) protein levels by inhibiting ubiquitination and degradation of HIF-1α, which regulates the transcription of many genes. Recent studies have revealed that many ligands can stimulate HIF-1α accumulation under nonhypoxic conditions. In this study, we show that angiotensin II (Ang II) increased HIF-1α protein levels in a time- and dose-dependent manner under normoxic conditions. Treatment of mesangial cells with Ang II (100 nM) increased production of reactive oxygen species (ROS). Ang II (100 nM) increased the phosphorylation of PDK-1 and Akt/PKB in glomerular mesangial cells. Ang II-stimulated HIF-1α accumulation was blocked by the phosphatidylinositol 3-kinase (PI-3K) inhibitors, Ly 294001, and wortmannin, suggesting that PI-3K was involved. Because increased ROS generation by Ang II may activate the PI-3K-PKB/Akt signaling pathway, these results suggest that Ang II may stimulate a ROS-dependent activation of the PI-3K-PKB/Akt pathway, which leads to HIF-1α accumulation.",
keywords = "Akt, Angiotensin II, Hypoxia-inducible factor 1, Phosphatidylinositol 3-kinase, Reactive oxygen species",
author = "Chen, {Tso Hsiao} and Wang, {Jin Fong} and Paul Chan and Lee, {Horng Mo}",
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AU - Chan, Paul

AU - Lee, Horng Mo

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N2 - Hypoxia increases hypoxia-inducible factor 1α (HIF-1α) protein levels by inhibiting ubiquitination and degradation of HIF-1α, which regulates the transcription of many genes. Recent studies have revealed that many ligands can stimulate HIF-1α accumulation under nonhypoxic conditions. In this study, we show that angiotensin II (Ang II) increased HIF-1α protein levels in a time- and dose-dependent manner under normoxic conditions. Treatment of mesangial cells with Ang II (100 nM) increased production of reactive oxygen species (ROS). Ang II (100 nM) increased the phosphorylation of PDK-1 and Akt/PKB in glomerular mesangial cells. Ang II-stimulated HIF-1α accumulation was blocked by the phosphatidylinositol 3-kinase (PI-3K) inhibitors, Ly 294001, and wortmannin, suggesting that PI-3K was involved. Because increased ROS generation by Ang II may activate the PI-3K-PKB/Akt signaling pathway, these results suggest that Ang II may stimulate a ROS-dependent activation of the PI-3K-PKB/Akt pathway, which leads to HIF-1α accumulation.

AB - Hypoxia increases hypoxia-inducible factor 1α (HIF-1α) protein levels by inhibiting ubiquitination and degradation of HIF-1α, which regulates the transcription of many genes. Recent studies have revealed that many ligands can stimulate HIF-1α accumulation under nonhypoxic conditions. In this study, we show that angiotensin II (Ang II) increased HIF-1α protein levels in a time- and dose-dependent manner under normoxic conditions. Treatment of mesangial cells with Ang II (100 nM) increased production of reactive oxygen species (ROS). Ang II (100 nM) increased the phosphorylation of PDK-1 and Akt/PKB in glomerular mesangial cells. Ang II-stimulated HIF-1α accumulation was blocked by the phosphatidylinositol 3-kinase (PI-3K) inhibitors, Ly 294001, and wortmannin, suggesting that PI-3K was involved. Because increased ROS generation by Ang II may activate the PI-3K-PKB/Akt signaling pathway, these results suggest that Ang II may stimulate a ROS-dependent activation of the PI-3K-PKB/Akt pathway, which leads to HIF-1α accumulation.

KW - Akt

KW - Angiotensin II

KW - Hypoxia-inducible factor 1

KW - Phosphatidylinositol 3-kinase

KW - Reactive oxygen species

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