Abstract
Recently, substantial amount of data was accumulated in the literature suggesting an important role of epigenetics in formation of long-term synaptic plasticity - the main cellular mechanism of learning and memory. In this work, we studied the effect of inhibition of histone deacetylases, one of the types of epigenetic modifications, on the formation of long-term potentiation of synaptic responses in premotor (command) neurons of the avoidance behavior of the grape snail. Potentiation of synaptic inputs in these neurons underlies aversive memory in this animal. We showed that histone deacetylase inhibitor sodium butyrate increases the amplitude of long-term potentiation caused by five tetanizations of the sensory nerve, combined with application of serotonin. We also found that application of sodium butyrate by itself caused an increase in EPSP amplitude 4 hours after application. However, this increase cannot underlie the observed effect of long-term potentiation, which was observed throughout the experiment. Thus, in our work, we have demonstrated the role of histone modifications in long-term changes in synaptic plasticity.
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