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- W1975078422 abstract "1. The quantities of serotonin that are released from isolated leech ganglia in vitro were measured with the sensitive neurochemical techniques of HPLC-EC. 2. Segmental ganglia were exposed to elevated concentrations of potassium that depolarize leech serotonin-containing neurons by approximately 35 mV per decade. 3. Each segmental ganglion released on average 0.20 pmol of serotonin during 10 min of incubation in a solution containing 64 mM K+. 4. The rate of serotonin release increased nearly four-fold to 0.74 pmol/10 min when ganglia were incubated in 120 mM K+. 5. The rates of ganglionic serotonin release in 120 mM K+ were quantitatively similar in these three, experimentally important species of leeches: Hirudo medicinalis, Macrobdella decora and Haementeria ghilianii. 6. Ionic substitution experiments with the divalent cations Mg2+ and Co2+ indicated that the release of serotonin from leech ganglia is mediated by a Ca2+ dependent process. 7. The serotonin-uptake blockers, imipramine and chlorimipramine, did not increase the amount of serotonin released in elevated potassium. 8. Vitally staining the identified serotonin-containing neurons with Neutral Red dye did not reduce the quantity of serotonin that was released from the ganglia in elevated potassium. 9. This study demonstrates the capacity of leech ganglia to release the neurochemical serotonin, and the rates of transmitter release increase with the degree of depolarization of serotonin-containing neurons." @default.
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- W1975078422 date "1991-01-01" @default.
- W1975078422 modified "2023-09-27" @default.
- W1975078422 title "Serotonin is released from isolated leech ganglia by potassium-induced depolarization" @default.
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- W1975078422 doi "https://doi.org/10.1016/0742-8413(91)90268-x" @default.
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