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Decrease in mRNA levels but not in the density of D2 dopamine receptors in rat striatum after transient forebrain
F Benfenati1, M Cimino, M Zoli
1Institute of Human Physiology, University of Modena, Italy.
Neuroscience Letters
|May 13, 1991
Summary
Transient forebrain ischemia in rats impairs dopamine D2 receptor mRNA synthesis in the striatum. This suggests a lasting impact on D2 dopaminoceptive neurons, even if receptor density appears normal.
Area of Science:
- Neuroscience
- Molecular Biology
- Ischemia Research
Background:
- Transient forebrain ischemia can cause neuronal damage and alter neurotransmitter systems.
- Dopamine receptors, particularly D2, play crucial roles in striatal function.
- Understanding long-term molecular changes post-ischemia is vital for therapeutic development.
Purpose of the Study:
- To investigate the impact of transient forebrain ischemia on D2 dopamine receptor mRNA and binding sites in the rat striatum.
- To assess the long-term effects on D2 dopaminergic signaling pathways.
Main Methods:
- In situ hybridization histochemistry was used to analyze D2 dopamine receptor mRNA levels.
- D1 and D2 receptor binding sites were quantified in rat striatum 7 days post-ischemia.
Main Results:
- A patchy disappearance of D2 dopamine receptor mRNA was observed in the dorsolateral striatum.
- D1 binding sites decreased in the same region, but D2 receptor density showed no significant change.
Conclusions:
- Forebrain ischemia may lead to a long-lasting impairment in the neosynthesis of D2 dopamine receptors.
- Striatal D2 dopaminoceptive neurons might experience functional deficits despite normal D2 receptor density post-ischemia.