Publications by authors named "J Nakai"

To test the hypothesis that a sleep-like quiescent state enhances memory consolidation in the pond snail , we interposed a period in which snails experienced either a quiescent, sleeping state or an active, non-sleeping state following escape behavior suppression learning (EBSL). During EBSL training, the number of escapes made by a snail from a container was significantly suppressed using an external aversive stimulus (punishment). After training, the snails were divided into two groups.

View Article and Find Full Text PDF

Heterozygous de novo mutations in Munc18-1, which is essential for neurotransmitter release, cause early infantile epileptic encephalopathy. Munc18-1-linked epilepsy is currently an untreatable disorder and its precise disease mechanism remains elusive. Here, we investigated how Munc18-1 pathogenic variants affect inhibitory neurons using .

View Article and Find Full Text PDF
Article Synopsis
  • VPS45 is crucial for SNARE-mediated membrane fusion in endosomal trafficking, but its specific function is still unclear.
  • A genetic suppressor screen revealed that a mutation in another SM protein, VPS33A, can counteract the negative effects of losing VPS45, specifically a temperature-sensitive lethality.
  • The mutation (M376I) in VPS33A targets domain 3a, which is important for assembling SNARE complexes, emphasizing its significance in the function of endosomal SM proteins and membrane fusion processes.
View Article and Find Full Text PDF

In the gastropod mollusk , insulin-like peptides in the central nervous system (CNS) control behavioral changes associated with associative learning. Insulin administration to the CNS enhances the synaptic plasticity involved in this type of learning, but it has remained unclear which molecules in the insulin response cascade are involved. Here, to advance a comprehensive analysis, we used two-dimensional electrophoresis and comparative quantitative mass spectrometry to perform a protein analysis investigating the CNS molecules that respond to insulin administration.

View Article and Find Full Text PDF