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Disorders of Erythrocytes
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ドーパミナージックニューロンは,GABAの非正規の放出を通じて,ストライタル出力を阻害する
Nicolas X Tritsch1, Jun B Ding, Bernardo L Sabatini
1Department of Neurobiology, Howard Hughes Medical Institute, Harvard Medical School, 220 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|October 5, 2012
まとめ
ドーパミンニューロンは,VGATから独立して,彼らの軸索から抑制性神経伝達物質GABA (γ-アミノバター酸) を放出します. このGABAの放出はVMAT2に依存し,脳内のドーパミンニューロンのための新しい共伝達物質の役割を明らかにします.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- 神経化学 神経化学とは
背景:
- substantia nigraとventral tegmental領域のドーパミンニューロンは,ストライタル回路を調節する.
- ドーパミンの放出は,運動制御と報酬学習に不可欠です.
- ドーパミンニューロンシグナル伝達の正確なメカニズムはまだ研究中です.
研究 の 目的:
- ドーパミンニューロン媒介による線状投射ニューロンの阻害のメカニズムを調査する.
- ドーパミナージックアクソンから神経伝達物質の放出に責任のある分子機構を特定する.
- モノアミナージックニューロンにおけるGABAの潜在的共伝達物質の役割を調査する.
主な方法:
- ストライアタルスライスによる電気生理学的記録.
- 膀輸送体の遺伝子操作 (VGATとVMAT2)
- トランスポーター発現を評価するための免疫ヒストキミストリー.
主要な成果:
- ドーパミンニューロンの活性化により,GABAの放出によるストライタルプロジェクションニューロンが急速に抑制されます.
- ドーパミナージックアクソンからのGABA放出はVGATとは独立しているが,VMAT2.2に依存している.
- VGAT欠乏GABAergicニューロンにおけるVMAT2発現はGABAの放出をサポートする.
結論:
- ドーパミンニューロンは,GABAの放出のための新しいメカニズムを利用し,VMAT2.2を使用します.
- GABAは,ドーパミナージックニューロンにおける共伝達物質として作用し,そのシグナリングレパートリーを拡大します.
- これらの発見は,ドーパミンニューロンによるベースガンリア回路調節に関する新しい洞察を明らかにします.
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