Sonic hedgehog (Shh) regulates the expression of angiogenic growth factors in oxygen-glucose-deprived astrocytes by mediating the nuclear receptor NR2F2

Mol Neurobiol. 2013 Jun;47(3):967-75. doi: 10.1007/s12035-013-8395-9. Epub 2013 Feb 3.

Abstract

Sonic hedgehog (Shh) has been found to regulate the angiogenic growth factor such as VEGF, Ang-1, and Ang-2 during ischemic insults, but the underlying mechanism is not fully understood. In this study, we employed oxygen-glucose deprivation (OGD) in astrocytes to mimic the ischemia in vitro. We found that OGD could induce the expressions of VEGF, Ang-1, and Ang-2, with the expression of Shh signaling components increased. Moreover, inhibiting the Shh signaling pathway with 5EI, a specific antibody, could decrease the expressions of VEGF, Ang-1, and Ang-2. Furthermore, the administration of exogenous Shh could induce the expressions of VEGF, Ang-1, and Ang-2 in astrocytes. The results of silencing Gli-1, or NR2F2, exhibited that exogenous Shh could regulate the expressions of VEGF, Ang-1, and Ang-2 in astrocytes by activating the NR2F2, but not the Gli-1. These results suggested that Shh could regulate the angiogenic growth factor after ischemic insults in astrocytes, and the regulation was partially mediated by the NR2F2.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiopoietin-1 / genetics*
  • Angiopoietin-1 / metabolism
  • Angiopoietin-2 / genetics*
  • Angiopoietin-2 / metabolism
  • Animals
  • Astrocytes / drug effects
  • Astrocytes / metabolism*
  • COUP Transcription Factor II / drug effects
  • COUP Transcription Factor II / metabolism*
  • Disease Models, Animal
  • Gene Expression Regulation / drug effects
  • Glucose / deficiency*
  • Hedgehog Proteins / pharmacology*
  • Kruppel-Like Transcription Factors / metabolism
  • Oxygen / pharmacology*
  • Rats
  • Rats, Sprague-Dawley
  • Up-Regulation / drug effects
  • Vascular Endothelial Growth Factor A / genetics*
  • Vascular Endothelial Growth Factor A / metabolism
  • Zinc Finger Protein GLI1

Substances

  • Angiopoietin-1
  • Angiopoietin-2
  • COUP Transcription Factor II
  • Gli1 protein, rat
  • Hedgehog Proteins
  • Kruppel-Like Transcription Factors
  • Vascular Endothelial Growth Factor A
  • Zinc Finger Protein GLI1
  • Glucose
  • Oxygen