Functional contributions of the plasma membrane calcium ATPase and the sodium-calcium exchanger at mouse parallel fibre to Purkinje neuron synapses.
Pflugers Arch
; 465(2): 319-31, 2013 Feb.
Article
em En
| MEDLINE
| ID: mdl-23138229
ABSTRACT
We investigated how two calcium clearance mechanisms, the sodium-calcium exchanger-NCX, and the plasma membrane calcium ATPase-PMCA2, function at the facilitating cerebellar parallel fibre to Purkinje neuron (PF-PN) synapse. Forward mode NCX helped recover PF presynaptic calcium elevations when the PFs received a double stimulation and the calcium load was sufficiently high. A smaller presynaptic calcium load evoked by a single PF stimulation failed to recruit NCX in wild-type mice but did so when PMCA2 was absent in PFs from PMCA2 knockout mice. Simulated calcium dynamics using a simple single-compartment model reported qualitatively similar effects. Functionally, reduced NCX activity in the absence of PMCA also prolonged the recovery of facilitation at the PF-PN synapse, beyond that seen by reduced NCX activity alone. We conclude that PMCA and NCX work in parallel to accurately shape residual presynaptic calcium recovery dynamics and fine-tune facilitation at this important cerebellar synapse.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Células de Purkinje
/
Sinapses
/
Trocador de Sódio e Cálcio
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ATPases Transportadoras de Cálcio da Membrana Plasmática
/
Fibras Nervosas
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Pflugers Arch
Ano de publicação:
2013
Tipo de documento:
Article