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Hyperglycemia aggravates decrease in alpha-synuclein expression in a middle cerebral artery occlusion model.

Ju-Bin Kang1, Dong-Kyun Kim1, Dong-Ju Park1

  • 1Department of Anatomy, College of Veterinary Medicine, Research Institute of Life Science, Gyeongsang National University, Jinju, Korea.

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|January 24, 2019
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Hyperglycemia worsens stroke outcomes by increasing brain damage. This study found that high blood sugar reduces neuroprotective alpha-synuclein levels after ischemic injury.

Keywords:
MCAOhyperglycemiaα-Synuclein

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Pathology

Background:

  • Hyperglycemia is a significant risk factor for stroke.
  • It exacerbates neuronal damage and infarct volume following cerebral ischemia.
  • Alpha-synuclein is crucial in neuronal tissue and implicated in neurodegenerative diseases.

Purpose of the Study:

  • To investigate the effect of hyperglycemia on alpha-synuclein expression in middle cerebral artery occlusion (MCAO)-induced ischemic brain injury.
  • To determine if hyperglycemic conditions alter the neuroprotective role of alpha-synuclein.

Main Methods:

  • Induction of hyperglycemia in male Sprague-Dawley rats using streptozotocin.
  • Induction of focal cerebral ischemia via middle cerebral artery occlusion (MCAO).
  • Analysis of neurological deficits, infarct volume, and alpha-synuclein expression (Western blot, RT-PCR) in cerebral cortex tissues 24 hours post-MCAO.

Main Results:

  • MCAO induced significant neurological deficits and cerebral infarction, which were more severe in hyperglycemic rats.
  • Alpha-synuclein expression was decreased following MCAO injury.
  • Diabetic rats exhibited a more pronounced reduction in alpha-synuclein levels compared to non-diabetic rats.

Conclusions:

  • Hyperglycemia exacerbates cerebral ischemic injury.
  • The observed increase in brain damage in hyperglycemic conditions is associated with a significant decrease in alpha-synuclein expression.
  • Reduced alpha-synuclein may contribute to the heightened susceptibility to brain damage under hyperglycemic states.