English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Separation of presynaptic and postsynaptic contributions to depression by covariance analysis of successive EPSCs at the calyx of Held synapse

MPS-Authors
/persons/resource/persons15762

Scheuss,  V.
Department of Membrane Biophysics, MPI for biophysical chemistry, Max Planck Society;

/persons/resource/persons212517

Schneggenburger,  R.
Research Group of Synaptic Dynamics and Modulation, MPI for Biophysical Chemistry, Max Planck Society;

/persons/resource/persons15570

Neher,  E.
Department of Membrane Biophysics, MPI for biophysical chemistry, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Scheuss, V., Schneggenburger, R., & Neher, E. (2002). Separation of presynaptic and postsynaptic contributions to depression by covariance analysis of successive EPSCs at the calyx of Held synapse. Journal of Neuroscience, 22(3), 728-739. Retrieved from http://www.jneurosci.org/cgi/reprint/22/3/728.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-F44B-F
Abstract
Synaptic short-term plasticity is considered to result from multiple cellular mechanisms, which may include presynaptic and postsynaptic contributions. We have recently developed a non- stationary EPSC fluctuation analysis (Scheuss and Neher, 2001) to estimate synaptic parameters and their transient changes during short-term synaptic plasticity. Extending the classical variance-mean approach, a short train of stimuli is applied repetitively, and the resulting EPSCs are analyzed for means, variances, and covariances. This provides estimates of the quantal size and quantal content for each EPSC in the train, and furthermore, an estimate of the number of release sites. The latter is less sensitive to heterogeneity in the release probability than that of the variance-mean approach. Here, we applied this analysis to the calyx of Held synapse in brainstem slices of young rats (postnatal day 8-10). We found significant negative covariance in the amplitude of successive EPSCs in a train. The analysis showed that the 10-fold depression in the EPSC amplitude during 100 Hz trains at elevated extracellular Ca2+ concentration resulted from a 2.5-fold reduction in quantal size caused by postsynaptic AMPA receptor desensitization and saturation, and a fourfold reduction in quantal content, which was partially relieved by application of cyclothiazide. The number of release sites estimated by covariance analysis was approximate to2000 and significantly larger than estimates from variance-mean parabolas.