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Related Experiment Videos

Postmortem decay in glucocorticoid binding in human and primate brain.

R M Sapolsky1, M J Meaney

  • 1Department of Biological Sciences, Stanford University, CA 94305.

Brain Research
|May 10, 1988
PubMed
Summary

Glucocorticoid receptor levels in the human brain decrease significantly after death. Studies show binding is halved within 3.5 hours postmortem and undetectable by 24 hours, impacting research.

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Area of Science:

  • Neuroscience
  • Endocrinology

Background:

  • Glucocorticoid receptors (GRs) in the rodent brain are well-studied.
  • Translating these findings to human studies is valuable for understanding normal and diseased human brains.
  • Postmortem tissue degradation poses a significant challenge for accurate GR quantification.

Purpose of the Study:

  • To investigate the stability and potential decay of glucocorticoid receptors in postmortem human brain tissue.
  • To determine the impact of postmortem interval on the integrity of glucocorticoid receptors.

Main Methods:

  • Optimized assay conditions to remove endogenous glucocorticoids.
  • Quantified [3H]dexamethasone binding in human hippocampus at varying postmortem intervals (3-4.5 h and 12-24 h).
  • Assessed binding in primate temporal cortex slices left at room temperature to model postmortem decay.

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Main Results:

  • [3H]dexamethasone binding in human hippocampus was reduced by approximately 50% at 3-4.5 hours postmortem compared to fresh tissue.
  • No detectable binding was observed in human hippocampus at 12-24 hours postmortem.
  • Primate temporal cortex slices showed a ~50% decline in binding by 6 hours postmortem.

Conclusions:

  • Glucocorticoid receptors in the human brain are susceptible to rapid postmortem decay.
  • The postmortem interval significantly confounds the accurate quantification of brain glucocorticoid receptors.
  • These findings highlight the critical need to consider postmortem degradation when analyzing glucocorticoid receptor levels in human brain studies.