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Repeated stressful experiences differently affect brain dopamine receptor subtypes.
S Puglisi-Allegra1, E Kempf, C Schleef
1Istituto di Psicobiologia e Psicofarmacologia (CNR), Roma, Italy.
Life Sciences
|January 1, 1991
Summary
Restraint stress significantly alters dopamine receptor density in mice. Chronic stress decreases D2 receptors in the nucleus accumbens and caudate putamen, while increasing D1 receptors in the caudate putamen, causing receptor imbalance.
Area of Science:
- Neuroscience
- Pharmacology
- Stress Research
Background:
- Dopamine receptors (D1 and D2) play crucial roles in brain function.
- Environmental stressors can impact neurotransmitter systems, including dopamine.
- Understanding receptor adaptations to stress is vital for neurological health.
Purpose of the Study:
- To investigate the in vivo binding of D1 and D2 dopamine receptors.
- To examine receptor density changes in specific brain regions (caudate putamen and nucleus accumbens septi).
- To assess the impact of chronic restraint stress on dopamine receptor adaptation.
Main Methods:
- In vivo receptor binding assays using tritiated spiperone (D2 antagonist) and tritiated SCH 23390 (D1 antagonist).
- Administration of ten daily restraint stress sessions to mice.
- Measurement of receptor density (Bmax) in the caudate putamen (CP) and nucleus accumbens septi (NAS) 24 hours after the final stress session.
Main Results:
- A significant 64% decrease in D2 receptor density was observed in the NAS.
- No changes in D1 receptor density were found in the NAS.
- The CP showed an 11% reduction in D2 receptor density alongside a 10% increase in D1 receptor density.
Conclusions:
- Dopamine D1 and D2 receptors exhibit differential adaptations to chronic stress.
- Stress can induce an imbalance between D1 and D2 receptor populations in distinct brain regions.
- These findings highlight the complex neurochemical adaptations to environmental pressure.