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2004 Jan 01;113:318-27. doi: 10.1101/lm.72704.
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Selective modulation of some forms of schaffer collateral-CA1 synaptic plasticity in mice with a disruption of the CPEB-1 gene.
Alarcon JM, Hodgman R, Theis M, Huang YS, Kandel ER, Richter JD.
???displayArticle.abstract??? CPEB-1 is a sequence-specific RNA binding protein that stimulates the polyadenylation-induced translation of mRNAs containing the cytoplasmic polyadenylation element (CPE). Although CPEB-1 was identified originally in Xenopus oocytes, it has also been found at postsynaptic sites of hippocampal neurons where, in response to N-methyl-D-aspartate receptor activation, it is thought to induce the polyadenylation and translation of alphaCaMKII and perhaps other CPE-containing mRNAs. Because some forms of synaptic modification appear to be influenced by local (synaptic) protein synthesis, we examined long-term potentiation (LTP) in CPEB-1 knockout mice. Although the basal synaptic transmission of Schaffer collateral-CA1 neurons was not affected in the knockout mice, we found that there was a modest deficit in LTP evoked by a single train of 100 Hz stimulation, but a greater deficit in LTP evoked by one train of theta-burst stimulation. In contrast, LTP evoked by either four trains of 100 Hz stimulation or five trains of theta-burst stimulation were not or were only modestly affected, respectively. The deficit in LTP evoked by single stimulation in knockout mice appeared several minutes after tetanic stimulation. Long-term depression (LTD) evoked by 1 Hz stimulation was moderately facilitated; however, a stronger and more enduring form of LTD induced by paired-pulse 1 Hz stimulation was unaffected. These data suggest that CPEB-1 contributes in the translational control of mRNAs that is critical only for some selected forms of LTP and LTD.
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