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KMID : 0356419990170030151
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Journal of Korean Andrology
1999 Volume.17 No. 3 p.151 ~ p.156
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Difference in Serotonin Release after Administration of the Various Catecholamines in Rat Hippocampal Slices
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Song Yun-Seob
Kim Min-Eui
Park Young-Ho
Choi Hyung-Ki
Ahn Young-Soo
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Abstract
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Background and Purpose: Catecholamines have an effect on sexual drive. When the sympathetic nervous system is excited, norepinephrine is released from nerve terminals, epinephrine from the adrenal glands, and dopamine in the central nervous system. Serotonin has a central inhibitory effect on sexual drive. Major adrenergic and serotoninergic innervation is found in the hippocampal slices in the central nervous system in response to various catecholamines.
Materials and Methods: The hippocampus from the male rat brain was sliced. After 30 minutes’ incubation in normal biffer, the slices were incubated for 20 minutes in a buffer containing 0.1 μM [3H]5-HT and then washed. After administration of norepinephrine (10-5 M), dopamine (10-5 M), or epinephrine (10-5 M), the release of [3H]5-HT into the buffer was measured. The radioactivity in each buffer and tissue was counted, and the results were expressed as a percentage of the total activity. The value of released [3H]5-HT was expressed as percent of the value at 40 minutes when a steady atate of [3H]5-HT release had been obtained.
Results: After administration of norepinephrine, dopamine, and epinephrine, the values (mean±SE, %) were 115.7±2.3, 136.8±10.5, 107.4±7.7 at 60 minutes and 105.8±5.5, 140.7±7.7, 94.9±6.2 at 70 minutes vs. 96.6±1.9 at 60 minutes and 89.6±2.3 at 70 minutes for the control group. The release thus was increased significantly after administration of norepinephrine and dopamine, and the effect of dopamine was more significant than that of epinephrine.
Conclusions: Release of serotonin is increased by norepinephrine and dopamine. The effect of dopamine was more significant than that of epinephrine. Reciprocal increase in serotonin release after administration of catecholamines may be involved in their effect on sexual function.
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KEYWORD
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Dopamine, Epinephrine, Hippocampus, Norepinephrine, Serotonin
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