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• W2181551188 abstract "1. Opaline release in Aplysia provides a simple model system for examining the biochemical and electrophysiological mechanisms underlying glandular secretion and its modulation. The opaline gland is a large multivesicular structure, which is innervated by at least three large identified motor neurons located within the right pleural ganglion (28). In this paper we have investigated the roles of dopamine (DA), acetylcholine (ACh), and serotonin (5-HT) in this simple neural system. 2. DA infusion produces a gland contraction that is similar to the response produced by neural activity in the previously identified opaline motor neurons. 3. The gland response to DA infusion is not affected by blocking synaptic transmission in the gland, suggesting that DA acts directly on muscle cells surrounding the gland and not through interposed interneurons. 4. In addition to its effect of producing contractions of the gland, DA enhances the size of subsequent neurally evoked gland contractions and increases the size of excitatory junctional potentials (EJPs) recorded from the opaline gland. Thus DA may have an additional modulatory role in opaline release. 5. DA antagonists such as fluphenazine and haloperidol inhibit the gland response to DA and also block the gland contraction produced by neural activity in the identified motor neurons. In addition, the DA antagonists reversibly block the EJPs recorded from the gland cells. Compounds known to block the effects of ACh or 5-HT have no effect on the dopamine-induced gland contractions, the contractions produced by firing the motor neurons, or the EJPs evoked by motor neuron stimulation. These results suggest that DA may be the neurotransmitter used by the identified opaline motor neurons. 6. ACh produces a decrease in pressure recorded from the lumen of the opaline gland that can be blocked by hexamethonium. 7. While 5-HT does not directly produce a contraction, treatment of the gland with the transmitter increases the size of subsequent gland responses produced either by DA infusion or activity in the opaline motor neurons. This enhancement has a relatively slow onset and long duration and persists for more than 15 min after the serotonin is washed out. In 60% of the experiments 5-HT also increased the size of the EJPs recorded from the opaline gland. The results suggest a modulatory role for serotonin in opaline secretion similar to the one it plays in other neural systems in Aplysia." @default.
• W2181551188 created "2016-06-24" @default.
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• W2181551188 date "1982-12-01" @default.
• W2181551188 modified "2023-10-14" @default.
• W2181551188 title "Neurotransmitters producing and modulating opaline gland contraction in Aplysia californica" @default.
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• W2181551188 doi "https://doi.org/10.1152/jn.1982.48.6.1347" @default.
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