| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2017: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2016: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2015: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
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| Outline of Final Research Achievements |
The axon initial segment (AIS) is a highly excitable axonal domain near the soma and involved in initiation of action potentials in neurons. In the aim of elucidating mechanisms underlying determination of AIS distribution, we examined development of AIS in avian nucleus magnocellularis (NM), which is known to show differentiation of AIS distribution along the tonotopic axis. What we found was that the differentiation of AIS started after hearing onset and completed after hatch in vivo, while the differentiation was abolished in organotypic culture, where afferent input was totally absent during development, suggesting the importance of neuronal activity in defining the distribution of AIS. We also found that the activity-dependent changes of AIS distribution accompanied rearrangement of potassium channel expression at the AIS.
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