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• W2120383851 abstract "Activity-dependent changes in synaptic strength such as long-term potentiation (LTP) and long-term depression (LTD) are considered to be cellular mechanisms underlying learning and memory. Strengthening of a synapse for a few seconds or minutes is termed short-term potentiation (STP) and is normally unable to take part in the processes of synaptic tagging/capture due to its inability to set the “synaptic tags.” Here, we report that priming of synapses with ryanodine receptor agonists such as ryanodine (10 μM) or caffeine (10 mM) facilitates subsequent synaptic tagging/capture, enabling an STP protocol to establish a late-LTP in response to strong tetanization of a heterosynaptic input. We identified calcium/calmodulin-dependent protein kinase II (CaMKII) as mediating the primed synaptic tag setting, which persisted for 1 h. We also identified protein kinase Mζ (PKMζ), presumably captured from the strongly tetanized heterosynaptic input, as a plasticity-related protein maintaining the LTP at the tagged synapses. In addition, synaptic tags in primed STP were erased or interfered with by delivering low-frequency depotentiating stimulation 5 or 10 min after its induction, thus preventing capture of newly synthesized proteins. These data reveal a novel form of metaplasticity, whereby ryanodine receptor activation lowers the threshold for subsequent synaptic tagging/capture, thus priming weakly activated synapses for heterosynaptic interactions that promote long-term functional plasticity." @default.
• W2120383851 created "2016-06-24" @default.
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• W2120383851 date "2009-02-17" @default.
• W2120383851 modified "2023-09-23" @default.
• W2120383851 title "Priming of short-term potentiation and synaptic tagging/capture mechanisms by ryanodine receptor activation in rat hippocampal CA1" @default.
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• W2120383851 doi "https://doi.org/10.1101/lm.1255909" @default.
• W2120383851 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19223601" @default.
• W2120383851 hasPublicationYear "2009" @default.
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