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MicroRNAs (miRNAs) are noncoding RNAs that suppress translation of specific mRNAs. The miRNA machinery interacts with fragile X mental retardation protein (FMRP), which functions as translational repressor. We show that miR-125b and miR-132, as well as several other miRNAs, are associated with FMRP in mouse brain. miR-125b and miR-132 had largely opposing effects on dendritic spine morphology and...
Many types of synapses throughout the nervous system are transiently depressed during high-frequency stimulation. Several mechanisms have been proposed to account for this depression, including depletion of release-ready vesicles. However, numerous studies have raised doubts about the importance of depletion in depression of central synapses and have implicated alternative mechanisms, such as decreased...
Synapses that reliably activate their postsynaptic targets typically release neurotransmitter with high probability, are not very sensitive to changes in calcium entry, and depress. We have determined the mechanisms that give rise to these characteristic features at the climbing fiber to Purkinje cell synapse. We find that saturation of presynaptic calcium entry, of presynaptic release, and of postsynaptic...
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