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第117回日本解剖学会総会・全国学術集会 講演プログラム・抄録集 PDF ...

第117回日本解剖学会総会・全国学術集会 講演プログラム・抄録集 PDF ...

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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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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.

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