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Related Experiment Video

Updated: Apr 24, 2026

Sex Differences in Mouse Hippocampal Astrocytes after In-Vitro Ischemia
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Estradiol alleviates the ischemic brain injury-induced decrease of neuronal calcium sensor protein hippocalcin.

Phil-Ok Koh1

  • 1Department of Anatomy, College of Veterinary Medicine and Research Institute of Life Science, Gyeongsang National University, 501 Jinjudaero, Jinju 660-701, Gyeongnam, South Korea.

Neuroscience Letters
|September 7, 2014
PubMed
Summary
This summary is machine-generated.

Estradiol protects against brain injury by regulating hippocalcin expression and calcium levels. This study shows estradiol

Keywords:
EstradiolHippocalcinNeuroprotection

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Cell Biology

Background:

  • Estradiol exhibits neuroprotective effects in neurodegenerative conditions.
  • Hippocalcin is a critical neuronal calcium-binding protein involved in calcium buffering.
  • Intracellular calcium dysregulation is implicated in ischemic brain injury.

Purpose of the Study:

  • To investigate the effect of estradiol on hippocalcin expression in a rat model of focal cerebral ischemia.
  • To determine if estradiol modulates hippocalcin expression and calcium levels in glutamate-exposed neuronal cells.

Main Methods:

  • Ovariectomized rats underwent middle cerebral artery occlusion (MCAO) with vehicle or estradiol administration.
  • Proteomics, reverse transcription-PCR, and Western blot analyses were used to assess hippocalcin expression.
  • Primary hippocampal cell cultures were exposed to glutamate with or without estradiol to measure intracellular calcium and hippocalcin levels.

Main Results:

  • Estradiol treatment attenuated the decrease in hippocalcin expression observed in MCAO rats.
  • Estradiol prevented the reduction in hippocalcin expression induced by MCAO injury.
  • In cultured cells, estradiol normalized glutamate-induced increases in intracellular calcium and prevented hippocalcin downregulation.

Conclusions:

  • Estradiol exerts neuroprotection in ischemic brain injury by modulating hippocalcin expression.
  • Estradiol helps regulate intracellular calcium homeostasis in neuronal cells during ischemic stress.
  • These findings highlight estradiol's therapeutic potential in managing ischemic brain damage.