BMC Neuroscience

, 10:P219 | Cite as

Model of synaptic transmission in the calyx of Held

  • Dmitry Bibitchkov
  • Holger Taschenberger
  • Erwin Neher
Open Access
Poster presentation

Keywords

Synaptic Transmission Intracellular Calcium Concentration Patch Clamp Recording Synaptic Terminal Postsynaptic Receptor 

The calyx of Held is a giant synaptic terminal in the MNTB of the auditory brainstem. Observations of postsynaptic responses to repeated stimulation reveal that this synapse exhibits complex behavior, which results from the interplay between processes such as vesicle pool depletion, activity-dependent recovery from depletion, synaptic facilitation and postsynaptic receptor desensitization. Intracellular calcium concentration ([Ca2+]) plays an important role in the neurotransmitter release and the regulation of short-term plasticity [1]. We build a detailed computational model of the synaptic transmission at the calyx, which captures all the above mentioned processes and includes the dynamics of calcium and its influence on the parameters of synaptic dynamics. The model is based on electrophysiological data obtained by patch clamp recordings from postsynaptic MNTB cells in rat brainstem slices. Calcium dynamics and the functional dependences of synaptic parameters on [Ca2+] are modeled based on previously published data [2]. Stimulating the synapse at different frequencies (from 0.2 to 200 Hz) and using pharmacological manipulations, we were able to separate contributions of different processes and determine the parameters of synaptic dynamics, which fit experimental data. We compare the fit with the previous phenomenological model [3], which does not include explicit dynamics of intracellular Ca2+.

Notes

Acknowledgements

Supported by BMBF 01FQ0431 grant.

References

  1. 1.
    Neher E, Sakaba T: Multiple roles of calcium ions in the regulation of neurotransmitter release. Neuron. 2008, 59: 861-872. 10.1016/j.neuron.2008.08.019.PubMedCrossRefGoogle Scholar
  2. 2.
    Hosoi N, Sakaba T, Neher E: Quantitative analysis of calcium-dependent vesicle recruitment and its functional role at the calyx of Held synapse. J Neurosci. 2007, 27: 14286-14298. 10.1523/JNEUROSCI.4122-07.2007.PubMedCrossRefGoogle Scholar
  3. 3.
    Bibitchkov D, Bao J, Neher E: Information transmission by synapses with short-term synaptic plasticity. BMC Neurosci. 2007, 8: P90-10.1186/1471-2202-8-S2-P90.PubMedCentralCrossRefGoogle Scholar

Copyright information

© Bibitchkov et al; licensee BioMed Central Ltd. 2009

This article is published under license to BioMed Central Ltd.

Authors and Affiliations

  • Dmitry Bibitchkov
    • 1
    • 2
    • 3
  • Holger Taschenberger
    • 1
  • Erwin Neher
    • 1
    • 3
  1. 1.Department of Membrane BiophysicsMax-Planck-Institute for Biophysical ChemistryGöttingenGermany
  2. 2.Network Dynamics GroupMax-Planck-Institute for Dynamics and Self-OrganizationGöttingenGermany
  3. 3.Bernstein Center for Computational NeuroscienceGöttingenGermany

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