Vesicular release probability sets the strength of individual Schaffer collateral synapses
Vesicular release probability sets the strength of individual Schaffer collateral synapses
复制标题
囊泡释放概率决定了单个谢弗侧支突触的强度
DOI:
10.1101/2020.08.02.232850
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Dürst C
中科院分区:
文献类型:
--
作者:
Dürst C
Information processing in the brain is controlled by quantal release of neurotransmitters, a tightly regulated process. From ultrastructural analysis, it is known that presynaptic boutons along single axons differ in the number of vesicles docked at the active zone. It is not clear whether the probability of these vesicles to get released (pves) is homogenous or also varies between individual boutons. Here, we optically measure evoked transmitter release at individual Schaffer collateral synapses at different calcium concentrations, using the genetically encoded glutamate sensor iGluSnFR. Fitting a binomial model to measured response amplitude distributions allowed us to extract the quantal parametersN,pves, andq. We find that Schaffer collateral boutons typically release single vesicles under lowpvesconditions and switch to multivesicular release in high calcium saline. The potency of individual boutons is highly correlated with their vesicular release probability while the number of releasable vesicles affects synaptic output only under highpvesconditions.
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