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- W2296069419 abstract "The specific properties of a synapse determine how neuronal activity evokes neurotransmitter release. Evaluating changes in synaptic properties during sustained activity is essential to understanding how genetic manipulations and neuromodulators regulate neurotransmitter release. Analyses of postsynaptic responses to high-frequency stimulation have provided estimates of the size of the readily-releasable pool (RRP) of vesicles (N0) and the probability of vesicular release (p) at multiple synapses.Here, we introduce a model-based approach at the calyx of Held synapse in which depletion and the rate of replenishment (R) determine the number of available vesicles, and facilitation leads to a use-dependent increase in p when initial p is low.When p is high and R is low, we find excellent agreement between estimates based on all three methods and the model. However, when p is low or when significant replenishment occurs between stimuli, estimates of different methods diverge, and model estimates are between the extreme estimates provided by the other approaches.We compare our model-based approach to three other approaches that rely on different simplifying assumptions. Our findings suggest that our model provides a better estimate of N0 and p than previously-established methods, likely due to inaccurate assumptions about replenishment. More generally, our findings suggest that approaches commonly used to estimate N0 and p at other synapses are often applied under experimental conditions that yield inaccurate estimates.Careful application of appropriate methods can greatly improve estimates of synaptic parameters." @default.
- W2296069419 created "2016-06-24" @default.
- W2296069419 creator A5037488240 @default.
- W2296069419 creator A5053791142 @default.
- W2296069419 date "2016-05-01" @default.
- W2296069419 modified "2023-10-08" @default.
- W2296069419 title "Determining synaptic parameters using high-frequency activation" @default.
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- W2296069419 doi "https://doi.org/10.1016/j.jneumeth.2016.02.021" @default.
- W2296069419 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4833598" @default.
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