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Thick brain slices model the ischemic penumbra.

G C Newman1, F E Hospod, P Wu

  • 1Department of Neurology, SUNY, Stony Brook 11794.

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

Thicker brain slices (over 600 µm) show increased anaerobic metabolism and potential ischemic injury, impacting 2-deoxyglucose (2DG) uptake. These models aid research into the ischemic penumbra.

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Area of Science:

  • Neuroscience
  • Cellular Metabolism
  • Brain Slice Physiology

Background:

  • Hypothalamic brain slices are crucial models for studying neuronal function and injury.
  • Understanding metabolic changes in varying slice thicknesses is vital for accurate experimental interpretation.

Purpose of the Study:

  • To investigate the impact of hypothalamic brain slice thickness on 2-deoxyglucose (2DG) metabolism, lactate accumulation, and morphology.
  • To evaluate the utility of different slice thicknesses as models for studying the ischemic penumbra.

Main Methods:

  • Assessment of 2-deoxyglucose (2DG) metabolism, lactate accumulation, and inulin spaces in hypothalamic slices (400-1000 µm).
  • Morphological analysis at light and ultrastructural levels.
  • Evaluation of in vitro glucose utilization over time.

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Main Results:

  • Increased glycolytic flux and anaerobic metabolism observed in slices >600 µm, correlated with increased inulin-exclusion space.
  • 700-µm slices exhibited surface metabolism similar to 540-µm slices but with central 2DG phosphorylation.
  • 1000-µm slices showed reduced 2DG and increased 2DG6P, indicating impaired 2DG transport and potential ischemic injury spread.

Conclusions:

  • Slice thickness significantly influences metabolic profiles and can induce ischemic-like changes.
  • Thicker slices (700-1000 µm) present a useful, albeit complex, model for investigating the neurochemistry and neuropharmacology of the ischemic penumbra.
  • Despite metabolic alterations, significant morphological damage was minimal in thicker slices, suggesting preserved cellular integrity for a limited duration.