2014, Number 2
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Salud Mental 2014; 37 (2)
La liberación de calcio de los depósitos intracelulares promueve la secreción de serotonina en terminales sinápticas
Trueta C
Language: Spanish
References: 68
Page: 103-110
PDF size: 651.83 Kb.
ABSTRACT
This work analyses the role of intracellular calcium pools in serotonin
release from nerve terminals. Experiments were carried out in synapses
formed in culture between serotonergic Retzius neurones and
pressure mechanosensory neurons, isolated from the Central Nervous
System of the leech. In this configuration, serotonin is released from
clear vesicles at synapses or from extrasynaptic dense core vesicles.
Locking ryanodine receptors in a sub-conductance state by incubation
with 100 µM ryanodine caused an elongation of the synaptic
potential in response to a presynaptic action potential or to trains
of them, suggesting that calcium released from the endoplasmic reticulum
through these channels reaches the synaptic vesicles and may
promote their fusion with the plasma membrane. By contrast, depletion
of intracellular calcium pools by incubation with 500 nM thapsigargin
gradually decreased paired-pulse synaptic facilitation and
abolished extrasynaptic axonal serotonin release in response to trains
of impulses. All this occurred without changes in the properties of the
postsynaptic membrane, indicating that intracellular calcium release
participates in a feedback mechanism that enhances presynaptic and
perisynaptic release in serotonergic neurons.
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