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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
1
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pubmed:dateCreated |
1983-1-19
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pubmed:abstractText |
The ionic mechanism of a membrane effect of 5-hydroxytryptamine (5-HT) on neuropile glial (NG) cells in ganglia of the medicinal leech was investigated with conventional single-barrelled microelectrodes. Control experiments were made with double-barrelled ion-selective microelectrodes. 5-Hydroxytryptamine hyperpolarized the NG-cell membrane and increased the conductance considerably. Methysergide, a potent 5-HT antagonist, blocked the 5-HT-induced hyperpolarization completely. When leech ganglia were superfused with physiological bathing media free of 5-HT, the NG-cell membrane conductance returned to the original value, but the membrane potential recovered only partially from the hyperpolarization in most experiments. In glial membranes artificially depolarized by means of constant-current injection, the amplitude of the 5-HT response increased. The amplitude decreased with membrane hyperpolarization and reversed at - 73 mV, close to the potassium equilibrium potential. The reversal potential changed by 52 mV when the extracellular potassium concentration was altered by a factor of 10. We conclude that 5-HT increases the potassium conductance of NG-cell membranes.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0006-8993
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
28
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pubmed:volume |
250
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
111-21
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:7139311-Animals,
pubmed-meshheading:7139311-Bufotenin,
pubmed-meshheading:7139311-Cell Membrane,
pubmed-meshheading:7139311-Ganglia,
pubmed-meshheading:7139311-Leeches,
pubmed-meshheading:7139311-Membrane Potentials,
pubmed-meshheading:7139311-Neuroglia,
pubmed-meshheading:7139311-Potassium,
pubmed-meshheading:7139311-Serotonin
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pubmed:year |
1982
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pubmed:articleTitle |
Ionic mechanism of a hyperpolarizing 5-hydroxytryptamine effect on leech neuropile glial cells.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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