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Does Intravitreal Dopamine Agonist and Antagonist Administration Have Effects on the Brain? An Experimental Study in
Mehmet Nuri Kocak1, Orhan Ates2, Ahmet Hacımuftuoglu3
1Department of Neurology, Atatürk University School of Medicine, Erzurum, Turkey.
The Eurasian Journal of Medicine
|March 21, 2022
Summary
Intravitreal dopamine agonists and antagonists impact brain function. Dopamine agonists improved memory and reduced neuron damage, while antagonists increased it, affecting locomotor activity.
Area of Science:
- Neuroscience
- Ophthalmology
- Pharmacology
Background:
- Dopaminergic pathways may link the retina and brain.
- Understanding these connections is crucial for neurological and visual health.
Purpose of the Study:
- To investigate potential interactions between the retina and basal ganglia via the dopaminergic system.
- To assess the effects of dopamine modulation on neural function and behavior.
Main Methods:
- 32 rats were divided into healthy, sham, dopamine antagonist (risperidone), and dopamine agonist (apomorphine) groups.
- Locomotor activity and Morris water maze tests were used to evaluate changes in movement, memory, and attention.
- Histopathological examination of basal ganglia and hippocampus regions was performed.
Main Results:
- Apomorphine (agonist) increased resting time and improved learning times in the water maze.
- Risperidone (antagonist) led to significantly higher neuron damage in the substantia nigra and hippocampus.
- Apomorphine treatment resulted in significantly lower neuron damage compared to healthy controls.
Conclusions:
- Intravitreal dopamine agonists and antagonists alter the cerebral dopaminergic system.
- These alterations manifest as changes in locomotor activity, memory, and histopathological integrity.
- The retina-basal ganglia dopaminergic connection influences cognitive and motor functions.
