BDNFは,モルヒンの作用の負の調節剤である
Ja Wook Koo1, Michelle S Mazei-Robison, Dipesh Chaudhury
1Fishberg Department of Neuroscience and Friedman Brain Institute, Mount Sinai School of Medicine, New York, NY 10029, USA.
まとめ
脳由来神経栄養因子 (BDNF) は驚くほど VTA と NAc のドーパミンニューロンを調節することによって,モルヒンの報酬に逆らいます. VTAにおけるBDNFを抑制すると,モルヒンは強化されます.
科学分野:
- 神経科学は神経科学である.
- 分子生物学は分子生物学である.
- 薬理学 薬理学とは
背景:
- 脳由来ニューロトロフィック因子 (BDNF) は,神経の可塑性と薬物報酬を高めることが知られています.
- 慢性的なモルヒン曝露と報酬回路の文脈におけるその役割は完全に理解されていません.
研究 の 目的:
- 慢性的なモルヒネ曝露の影響を媒介するBDNFのベントラル・テグメンタル領域 (VTA) と核アクンベンス (NAc) の役割を調査する.
- モルヒンの報酬とドーパミンのニューロン活動に対するBDNFの影響の基礎となる分子メカニズムを解明する.
主な方法:
- VTAにおけるBDNFの遺伝的抑制を活用した.
- NAc.におけるVTAドーパミン (DA) 端末の光学刺激を使用した.
- 慢性的なモルヒン曝露とBDNF操作後のNAcにおける遺伝子発現を分析した.
主要な成果:
- VTAにおけるBDNFの抑制は,DAニューロンの興奮性を高め,報酬を促進するモルヒンの能力を強化した.
- NAcにおけるVTA DA端末の光学刺激により,モルヒンの報酬に対するBDNFの抑制効果が逆転した.
- BDNFによって調節されるNAcの特定の遺伝子を特定し,慢性的なモルヒン曝露におけるその対作用機能を媒介する.
結論:
- BDNFは,慢性的なモルヒン曝露に対する脳の反応を調節する上で,重要な対抗的な役割を果たします.
- これらの発見は,モルヒネ依存症を理解し,潜在的に治療するためのVTA-NAc回路内の新しい分子標的を明らかにします.
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