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Nicotinamide attenuates the injury-induced decrease of hippocalcin in ischemic brain injury.

Phil-Ok Koh1

  • 1Department of Anatomy, College of Veterinary Medicine and Research Institute of Life Science, Gyeongsang National University, Jinju, South Korea. pokoh@gnu.ac.kr

Neuroscience Letters
|April 24, 2013
PubMed
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Nicotinamide treatment reduces brain damage from focal cerebral ischemia by restoring hippocalcin expression. This key protein helps prevent neuronal cell death during ischemic injury.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Focal cerebral ischemia causes brain damage.
  • Nicotinamide is a cofactor in preventing this damage.
  • Hippocalcin is a calcium buffer protein that reduces apoptosis.

Purpose of the Study:

  • To investigate if nicotinamide affects hippocalcin expression during cerebral ischemia.
  • To understand the role of hippocalcin in nicotinamide's neuroprotective effects.

Main Methods:

  • Middle cerebral artery occlusion (MCAO) model in Sprague-Dawley rats.
  • Proteomic analysis, RT-PCR, and Western blot to assess hippocalcin expression.
  • In vitro study using cultured hippocampal cells exposed to glutamate toxicity.

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Main Results:

  • Nicotinamide treatment reduced infarct volume in MCAO rats.
  • Proteomics revealed decreased hippocalcin in MCAO, which nicotinamide attenuated.
  • RT-PCR and Western blot confirmed nicotinamide restored hippocalcin levels.
  • Nicotinamide prevented glutamate-induced decrease in hippocalcin in vitro.

Conclusions:

  • Nicotinamide modulates hippocalcin expression during cerebral ischemic injury.
  • Restoration of hippocalcin by nicotinamide contributes to preventing neuronal cell death.
  • Hippocalcin is a potential therapeutic target for ischemic stroke.