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Related Experiment Videos

Early postischemic 45Ca accumulation in rat dentate hilus.

H Benveniste1, N H Diemer

  • 1Institute of Neuropathology, University of Copenhagen, Denmark.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|October 1, 1988
PubMed
Summary

Early calcium accumulation in the hippocampus after ischemia, specifically in the dentate hilus, indicates increased cellular uptake before irreversible damage. This finding is crucial for understanding ischemic cell changes and potential therapeutic targets.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Ischemic Pathophysiology

Background:

  • Postischemic calcium accumulation correlates with ischemic cell damage progression.
  • Vulnerable hippocampal cells are expected to show early, specific calcium uptake after ischemia.

Purpose of the Study:

  • To investigate the time-dependent regional accumulation of calcium (45Ca) in the rat hippocampus 1 hour after transient ischemia.
  • To differentiate between active calcium uptake and passive influx across compromised cell membranes.

Main Methods:

  • Autoradiography was used to map the distribution of 45Ca and 3H-inulin (extracellular marker) in rat hippocampus.
  • 45Ca was administered via microdialysis probes and intraventricular injection.
  • Comparisons were made between control conditions and 1 hour post-20 minute ischemia.

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Main Results:

  • Control 45Ca distribution mirrored 3H-inulin distribution, reflecting extracellular space.
  • A significant accumulation of 45Ca was observed in the dentate hilus 1 hour after ischemia.
  • No alterations in 3H-inulin distribution were detected, indicating intact extracellular space.

Conclusions:

  • Massive 45Ca accumulation in the dentate hilus suggests increased Ca2+ uptake by cells.
  • This uptake occurs before irreversible cell damage, distinguishing it from passive calcium influx.
  • The findings highlight early cellular calcium handling as a key event in post-ischemic hippocampal changes.