The time course of the requirement for local protein synthesis in the stabilization of learning-related synaptic growth and the persistence of long-term memory was examined using Aplysia bifurcated sensory neuron-motor neuron cultures. We find that, following repeated pulses of serotonin (5-HT), the local perfusion of emetine, an inhibitor of protein synthesis, or a TAT-AS oligonucleotide directed against ApCPEB blocks long-term facilitation (LTF) at either 24 or 48 hr and leads to a selective retraction of newly formed sensory neuron varicosities induced by 5-HT. By contrast, later inhibition of local protein synthesis, at 72 hr after 5-HT, has no effect on either synaptic growth or LTF. These results define a specific stabilization phase for the storage of long-term memory during which newly formed varicosities are labile and require sustained CPEB-dependent local protein synthesis to acquire the more stable properties of mature varicosities required for the persistence of LTF.
Sustained CPEB-dependent local protein synthesis is required to stabilize synaptic growth for persistence of long-term facilitation in Aplysia / Miniaci, Maria; Kim, J. H.; Puthanveettil, S; Si, K; Zhu, H; Kandel, E. R. AND BAILEY C. H.. - In: NEURON. - ISSN 0896-6273. - 59:(2008), pp. 1024-1036. [10.1016/j.neuron.2008.07.036]
Sustained CPEB-dependent local protein synthesis is required to stabilize synaptic growth for persistence of long-term facilitation in Aplysia.
MINIACI, MARIA;
2008
Abstract
The time course of the requirement for local protein synthesis in the stabilization of learning-related synaptic growth and the persistence of long-term memory was examined using Aplysia bifurcated sensory neuron-motor neuron cultures. We find that, following repeated pulses of serotonin (5-HT), the local perfusion of emetine, an inhibitor of protein synthesis, or a TAT-AS oligonucleotide directed against ApCPEB blocks long-term facilitation (LTF) at either 24 or 48 hr and leads to a selective retraction of newly formed sensory neuron varicosities induced by 5-HT. By contrast, later inhibition of local protein synthesis, at 72 hr after 5-HT, has no effect on either synaptic growth or LTF. These results define a specific stabilization phase for the storage of long-term memory during which newly formed varicosities are labile and require sustained CPEB-dependent local protein synthesis to acquire the more stable properties of mature varicosities required for the persistence of LTF.File | Dimensione | Formato | |
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