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117 167<br />
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Alterations of synaptic transcytosis induced by ethanol exposure:<br />
apocrinelike structure in the rat<br />
Tomiko Yakura 1 , Takanori Miki 1 , JunQian Liu 1 , Kenichi Ohta 1 ,<br />
Katsuhiko Warita 1 , Yoshiki Matsumoto 2 , Shingo Suzuki 1 , Motoki Tamai 1 ,<br />
Yoshiki Takeuchi 1<br />
1<br />
Department of Anatomy and Neurobiology, Faculty of Medicine, Kagawa<br />
University, 2 Laboratory of Animal Science, Faculty of Agriculture, Kagawa<br />
University<br />
Effects of alcohol exposure on synaptic structure were investigated in the NST<br />
in the rat. Ethanolfed animals were allowed free access to liquid diet containing<br />
ethanol for 3 weeks. A few terminals were characterized by deep indentation<br />
of axodendritic membranes into the postsynaptic neurons which was similar to<br />
the apocrine structure. Other animals of ethanol exposure received injection of<br />
WGAHRP into the vagus nerve and were prepared for electron microscopy.<br />
HRPreaction product RP was recognized easily as electron dense lysosomal<br />
substance when lead citrate staining was omitted. The terminals containing HRP<br />
RP also revealed quite similar structure to indentation of axodendritic membranes<br />
described above. The results are considered to confirm that terminals forming<br />
“apocrine-like structure” are originated from afferent fibers of the vagus nerve.<br />
The present study raised the possibility that remarkable alteration of the synaptic<br />
structure induced by ethanol exposure leads neuronal transcytosis of materials<br />
including proteins which is absolutely different from vesicular exocytosis involved<br />
in chemical synaptic transmission.<br />
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Lysosomeassociated membrane protein2 LAMP2<br />
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GM130 <br />
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LC3 LAMP2 <br />
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Synergistic interaction between Golgi outposts and RNA granules in<br />
postlocal translational secretory pathway<br />
Souichi Oe, Yasuko Noda<br />
Jichi Med. Univ. Tochigi, Japan<br />
In the central nervous system, neurons have Golgi outposts in dendrites and<br />
it has been shown that its subcellular distribution and morphology are related<br />
with various aspects of cellular event. In this study, we analyzed the subcellular<br />
localization of Golgi outposts under the various stimulations in cultured<br />
hippocampal neurons. In normal conditions, Golgi outposts localized in basal<br />
dendrites and contained some Golgi matrix proteins including GM130, GRASP65<br />
and BicaudalD2. When the neurons were cultured with several stimulations, the<br />
distribution of Golgi outposts were enhanced towards the distal dendrites. This<br />
observation was similar to the dynamics of RNA granules, and in fact, Golgi<br />
outposts colocalized with CPEB which is the translational repressor and the<br />
component of the RNA granules. Furthermore, we constructed the GFP based<br />
reporter plasmid that has the signal sequence and the dendritic localization signal<br />
of CaMKII mRNA and observed the localization in dendrites with or without the<br />
stimulations. These results suggest that Golgi outposts act synergistically with<br />
RNA granules and contribute to the postlocal translational secretory pathway in<br />
dendrites.