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Dopamine and noradrenaline content in fish retina: modulation by serotonin
1Laboratorio de Neuroquímica, Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela.
Journal of Neuroscience Research
|January 1, 1987
Summary
Serotonin (5-HT) influences noradrenaline (NA) and dopamine (DA) levels in fish retinas. This study reveals 5-HT receptor-mediated modulation of these neurotransmitters, impacting visual processing.
Area of Science:
- Neuroscience
- Ophthalmology
- Pharmacology
Background:
- The retina contains various neurotransmitters, including catecholamines and indoleamines.
- Understanding neurotransmitter interactions is crucial for comprehending retinal function and visual processing.
Purpose of the Study:
- To investigate the presence and role of noradrenaline (NA) and serotonin (5-HT) in the teleost retina.
- To explore the interaction between 5-HT and dopaminergic (DA) and noradrenergic (NA) neuronal elements.
Main Methods:
- Histofluorescence techniques to visualize catecholaminergic and indoleaminergic amacrine cells.
- High-performance liquid chromatography (HPLC) to quantify DA and NA levels.
- In vivo administration of 5-HT, its agonists, and antagonists to assess neurotransmitter level changes.
Main Results:
- Detected significant levels of DA and NA in the Eugerres plumieri retina.
- 5-HT administration increased NA and decreased DA levels.
- 5-HT receptor agonists partially mimicked these effects, while antagonists blocked them, indicating receptor mediation.
Conclusions:
- Serotonin (5-HT) modulates endogenous levels of noradrenaline (NA) and dopamine (DA) in the fish retina.
- This modulation is mediated through specific 5-HT receptors.
- Findings support the interaction between serotoninergic and dopaminergic/noradrenergic systems in the retina.