Abstract:
Low-threshold voltage-activated calcium conductances (LT-VACCs) play a substantial role in shaping the electrophysiological attributes of neurites. We have investigated how these conductances affect synaptic integration in a premotor nonspiking (NS) neuron of the leech nervous system. These cells exhibit an extensive neuritic tree, do not fire Na+-dependent spikes, but express an LT-VACC that was sensitive to 250 ÷M Ni2+ and 100 μM NNC 55-0396 (NNC). NS neurons responded to excitation of mechanosensory pressure neurons with depolarizing responses for which amplitude was a linear function of the presynaptic firing frequency. NNC decreased these synaptic responses and abolished the concomitant widespread Ca2+ signals. Coherent with the interpretation that the LT-VACC amplified signals at the postsynaptic level, this conductance also amplified the responses of NS neurons to direct injection of sinusoidal current. Synaptic amplification thus is achieved via a positive feedback in which depolarizing signals activate an LT-VACC that, in turn, boosts these signals. The wide distribution of LT-VACC could support the active propagation of depolarizing signals, turning the complex NS neuritic tree into a relatively compact electrical compartment. © 2015 the American Physiological Society.
Registro:
Documento: |
Artículo
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Título: | Graded boosting of synaptic signals by low-threshold voltage-activated calcium conductance |
Autor: | Tano, M.C.; Vilarchao, M.E.; Szczupak, L. |
Filiación: | Departamento de Fisiología, Biología Molecular y Celular, Universidad de Buenos Aires, Buenos Aires, Argentina Instituto de Fisiología Biología Molecular y Neurociencias, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Ciudad Universitaria, Buenos Aires, Argentina
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Palabras clave: | Calcium conductance; Dendritic integration; Nonspiking; Synaptic amplification; Window current; animal cell; Article; calcium conductance; controlled study; electrophysiology; evoked response; leech; motoneuron; nerve cell; nerve cell stimulation; nervous system; neurite; neurophysiology; nonhuman; postsynaptic potential; presynaptic potential; priority journal; sensory nerve cell; spike; synaptic transmission; action potential; animal; drug effects; metabolism; patch clamp technique; physiology; synapse; voltage sensitive dye imaging; calcium; calcium channel; calcium channel blocking agent; Action Potentials; Animals; Calcium; Calcium Channel Blockers; Calcium Channels; Leeches; Neurons; Patch-Clamp Techniques; Synapses; Voltage-Sensitive Dye Imaging |
Año: | 2015
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Volumen: | 114
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Número: | 1
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Página de inicio: | 332
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Página de fin: | 340
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DOI: |
http://dx.doi.org/10.1152/jn.00170.2015 |
Título revista: | Journal of Neurophysiology
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Título revista abreviado: | J. Neurophysiol.
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ISSN: | 00223077
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CODEN: | JONEA
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CAS: | calcium, 7440-70-2, 14092-94-5; Calcium; Calcium Channel Blockers; Calcium Channels
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223077_v114_n1_p332_Tano |
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Citas:
---------- APA ----------
Tano, M.C., Vilarchao, M.E. & Szczupak, L.
(2015)
. Graded boosting of synaptic signals by low-threshold voltage-activated calcium conductance. Journal of Neurophysiology, 114(1), 332-340.
http://dx.doi.org/10.1152/jn.00170.2015---------- CHICAGO ----------
Tano, M.C., Vilarchao, M.E., Szczupak, L.
"Graded boosting of synaptic signals by low-threshold voltage-activated calcium conductance"
. Journal of Neurophysiology 114, no. 1
(2015) : 332-340.
http://dx.doi.org/10.1152/jn.00170.2015---------- MLA ----------
Tano, M.C., Vilarchao, M.E., Szczupak, L.
"Graded boosting of synaptic signals by low-threshold voltage-activated calcium conductance"
. Journal of Neurophysiology, vol. 114, no. 1, 2015, pp. 332-340.
http://dx.doi.org/10.1152/jn.00170.2015---------- VANCOUVER ----------
Tano, M.C., Vilarchao, M.E., Szczupak, L. Graded boosting of synaptic signals by low-threshold voltage-activated calcium conductance. J. Neurophysiol. 2015;114(1):332-340.
http://dx.doi.org/10.1152/jn.00170.2015