報酬を求める側頭部下垂体オレクシンニューロンの役割
Glenda C Harris1, Mathieu Wimmer, Gary Aston-Jones
1Laboratory of Neuromodulation and Behavior, Department of Psychiatry, University of Pennsylvania, 705 Stellar Chance/6100 422 Curie Blvd, Philadelphia, Pennsylvania 19104-6100, USA. glenda@dolphin.upenn.edu
Nature
|August 16, 2005
まとめ
横部下垂体にあるオレキシンニューロンは,報酬を求める行動や薬物再発に不可欠です. これらのニューロンを活性化すると,報酬のシュープの好みを促進し,薬物探求を回復させ,中毒における彼らの役割を強調します.
科学分野:
- 神経科学は神経科学である.
- 神経生物学 神経生物学とは
- 依存症の研究 依存症の研究
背景:
- 側視床下部は,歴史的に報酬と動機付けと結びついています.
- オレキシン (ハイポクレチン) は,横向下垂体ニューロンに存在する神経ペプチドです.
- 以前の研究では,オレキシンニューロンが興奮,睡眠,食事,報酬における役割を示唆しています.
研究 の 目的:
- 報酬を求める行動における横向性下垂体オレクシンニューロンの役割を調査する.
- オレキシンニューロンが薬物と食物報酬に関与しているかどうかを判断する.
- 薬物再発と中毒におけるオレクシンシグナル伝達の可能性を調査する.
主な方法:
- 横部下垂体オレクシンニューロンの活性化.
- 薬物や食物に対する好みを測定する行動分析は,報酬のシグナルである薬物や食物に対する好みを測定する行動分析である.
- 化学遺伝子の活性化により,消滅した薬物探求行動を再生する.
- オレキシンAアンタゴニストとオレキシンAペプチドの投与は,腹部テグメンタル領域に直接投与する.
主要な成果:
- 横部下垂体オレクシンニューロンの活性化は,薬物と食物に対する好みと強く相関しています.
- これらのニューロンの化学的活性化は,消えた薬物探しの行動を回復させた.
- オレキシンAの対抗作用は,薬物探求行動の回復を阻害しました.
- 直接オレキシン 腹部テグメンタル領域への投与も,薬物探しの行動を回復させた.
結論:
- 側視床下垂体にあるオレキシンニューロンは,報酬を求める行動において重要な役割を果たします.
- これらのニューロンは,薬物再発と中毒に関与しています.
- ベントラル・テグメンタル領域におけるオレキシンシグナル伝達は,薬物探しの行動に不可欠である.
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