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Sigma binding parameters in developing rats predict behavioral efficacy of a sigma ligand
M K Hemstreet1, R R Matsumoto, W D Bowen
1Department of Neuroscience, Brown University, Providence, RI 02912.
Brain Research
|November 12, 1993
Summary
This study links sigma binding in rat brain synaptosomes to behavioral effects. Sigma binding sites in synaptosomes, not microsomes, correlate with drug-induced postural changes, suggesting their role in movement control.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Biology
Background:
- Sigma receptors are implicated in various neurological functions.
- Understanding the developmental trajectory of sigma binding is crucial for interpreting its role in behavior.
Purpose of the Study:
- To investigate the relationship between sigma binding and behavioral efficacy of a sigma ligand across different ages in rats.
- To determine if age-related changes in sigma binding correlate with functional outcomes.
Main Methods:
- Scatchard analysis was used to quantify [3H]1,3-di-o-tolylguanidine ([3H]DTG) binding to rat brain synaptosomal and microsomal fractions at various ages.
- The postural effects (dystonia) of rubral microinjections of DTG were assessed in age-matched rats.
Main Results:
- Significant age-related differences in [3H]DTG binding were observed in both synaptosomal and microsomal fractions.
- The degree of DTG-induced dystonia positively correlated with [3H]DTG binding in synaptosomal membranes at low ligand concentrations.
- No significant correlation was found between binding to the microsomal fraction and behavioral efficacy.
Conclusions:
- Sigma binding sites in brain synaptosomal membranes are functional receptors involved in the regulation of movement and posture.
- Developmental changes in synaptosomal sigma binding are functionally relevant to the behavioral effects of sigma ligands.