Dataset Information

Kinetic properties and functional dynamics of sodium channels during repetitive spiking in a slow pacemaker neuron.

ABSTRACT: We examined the kinetic properties of voltage-gated Na(+) channels and their contribution to the repetitive spiking activity of medullary raphé neurons, which exhibit slow pacemaking and strong spiking adaptation. The study is based on a combination of whole-cell patch-clamp, modeling and real-time computation. Na(+) currents were recorded from neurons in brain slices obtained from male and female neonatal rats, using voltage-clamp protocols designed to reduce space-clamp artifacts and to emphasize functionally relevant kinetic features. A detailed kinetic model was formulated to explain the broad range of transient and stationary voltage-dependent properties exhibited by Na(+) currents. The model was tested by injecting via dynamic clamp a model-based current as a substitute for the native TTX-sensitive Na(+) currents, which were pharmacologically blocked. The model-based current reproduced well the native spike shape and spiking frequency. The dynamics of Na(+) channels during repetitive spiking were indirectly examined through this model. By comparing the spiking activities generated with different kinetic models in dynamic-clamp experiments, we determined that state-dependent slow inactivation contributes significantly to spiking adaptation. Through real-time manipulation of the model-based current, we established that suprathreshold Na(+) current mainly controls spike shape, whereas subthreshold Na(+) current modulates spiking frequency and contributes to the pacemaking mechanism. Since the model-based current was injected in the soma, the results also suggest that somatic Na(+) channels are sufficient to establish the essential spiking properties of raphé neurons in vitro.

SUBMITTER: Milescu LS

PROVIDER: S-EPMC2945634 | biostudies-literature | 2010 Sep

REPOSITORIES: biostudies-literature

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Kinetic properties and functional dynamics of sodium channels during repetitive spiking in a slow pacemaker neuron.

Milescu Lorin S LS Yamanishi Tadashi T Ptak Krzysztof K Smith Jeffrey C JC

The Journal of neuroscience : the official journal of the Society for Neuroscience 20100901 36

We examined the kinetic properties of voltage-gated Na(+) channels and their contribution to the repetitive spiking activity of medullary raphé neurons, which exhibit slow pacemaking and strong spiking adaptation. The study is based on a combination of whole-cell patch-clamp, modeling and real-time computation. Na(+) currents were recorded from neurons in brain slices obtained from male and female neonatal rats, using voltage-clamp protocols designed to reduce space-clamp artifacts and to emphas ...[more]

PMID: 20826674

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Dataset Information

Kinetic properties and functional dynamics of sodium channels during repetitive spiking in a slow pacemaker neuron.

Publications

Kinetic properties and functional dynamics of sodium channels during repetitive spiking in a slow pacemaker neuron.

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