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Related Experiment Videos

Sigma receptors in post-mortem human brains.

A D Weissman1, T P Su, J C Hedreen

  • 1Addiction Research Center, National Institute on Drug Abuse, Baltimore, Maryland.

The Journal of Pharmacology and Experimental Therapeutics
|October 1, 1988
PubMed
Summary

This study characterized sigma receptors in human brains, finding highest densities in the cerebellum, nucleus accumbens, and cerebral cortex. These sigma receptors are stable post-mortem, ensuring reliable research.

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Sigma receptors are a class of non-dopaminergic binding sites in the brain.
  • Understanding their distribution and stability is crucial for neuropharmacological research.

Purpose of the Study:

  • To determine the pharmacological profile and regional distribution of sigma receptors in human autopsy brains.
  • To assess the stability of sigma receptors in post-mortem brain tissue.

Main Methods:

  • Utilized [3H]-haloperidol as a ligand to measure specific binding to sigma receptors, with spiperone blocking D2 dopamine sites.
  • Performed inhibition studies on human cerebellar membranes to characterize the pharmacological profile.
  • Conducted a post-mortem simulation study using guinea pig brains to evaluate receptor stability.

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Main Results:

  • Identified a single, saturable class of sigma receptors in the cerebellum (Kd = 0.95 +/- 0.12 nM).
  • Observed a pharmacological profile in human cerebellum consistent with rodent sigma binding sites.
  • Found highest sigma receptor densities in the cerebellum, nucleus accumbens, and cerebral cortex.
  • Demonstrated remarkable stability of sigma receptors under simulated post-mortem conditions (cooling/freezing).

Conclusions:

  • Sigma receptors exhibit specific pharmacological characteristics and regional distribution in the human brain.
  • The stability of sigma receptors post-mortem supports their reliable investigation in human brain studies.