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A Mouse Model of Hemorrhagic Transformation Induced by Acute Hyperglycemia Combined with Transient Focal Ischemia
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Manganese superoxide dismutase deficiency exacerbates ischemic brain damage under hyperglycemic conditions by

Suresh L Mehta1, Yanling Lin, Wenge Chen

  • 1Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technology Enterprise (BRITE), North Carolina Central University, BRITE Building, 302 East Lawson Street, Durham, NC 27707, USA.

Translational Stroke Research
|July 2, 2011
PubMed

Insights

Superoxide dismutase 2 (SOD2) deficiency worsens ischemic brain damage in hyperglycemia by increasing oxidative stress and DNA damage. This exacerbation is linked to suppressed autophagy regulation, highlighting SOD2

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Genetics

Background:

  • Preischemic hyperglycemia and reduced Superoxide Dismutase 2 (SOD2) activity worsen ischemic brain damage.
  • SOD2 plays a crucial role in mitigating oxidative stress within cells.

Purpose of the Study:

  • To investigate the impact of SOD2 mutation on ischemic brain damage in hyperglycemic mice.
  • To explore the relationship between SOD2 deficiency, autophagy regulation, and brain injury under hyperglycemic conditions.

Main Methods:

  • Hyperglycemic wild-type (WT) and heterozygous SOD2 knockout (SOD2(-/+)) mice were subjected to 30-min transient focal ischemia.
  • Brain samples were analyzed post-ischemia for infarct volume, superoxide production, oxidative DNA damage, and levels of autophagy markers (Beclin 1, DRAM, LC3).

Main Results:

  • Hyperglycemic SOD2(-/+) mice exhibited significantly larger infarct volumes compared to WT mice.
  • SOD2(-/+) mice showed early increases in superoxide production and oxidative DNA damage, alongside reduced SOD2 activity.
  • Ischemia suppressed autophagy stimulator levels in hyperglycemic SOD2(-/+) mice, contrasting with increased levels in WT mice.

Conclusions:

  • SOD2 deficiency exacerbates ischemic brain damage in hyperglycemic conditions through enhanced oxidative stress and DNA oxidation.
  • The detrimental effect of SOD2 knockdown is associated with the suppression of key autophagy regulators.

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