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Nucleus accumbens D2/3受容体は,特性の衝動性とコカイン強化を予測する
Jeffrey W Dalley1, Tim D Fryer, Laurent Brichard
1Behavioral and Clinical Neuroscience Institute, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK. jwd20@cam.ac.uk
まとめ
ネズミの特性の衝動性は,より高いコカイン使用を予測し,薬物曝露前にドーパミンD2/3受容体の可用性の低下と関連しています. これは,先発性要因が依存症の脆弱性に影響を及ぼすことを示唆しています.
科学分野:
- 神経科学は神経科学である.
- 依存症の研究 依存症の研究
- 行動科学は,行動科学である.
背景:
- 刺激剤依存症は衝動性に関連しているが,その背後にあるメカニズムは不明である.
- 薬物自己投与における衝動性の役割と,ドーパミン (DA) 機能との関係については,さらなる調査が必要である.
研究 の 目的:
- ネズミの特性の衝動性とコカインの自己投与との予測的関係を調査する.
- ドーパミン (DA) D2/3受容体における薬物曝露前の変化を,衝動性のラットで調べる.
主な方法:
- 特徴の衝動性を評価するためにラットモデルを使用した.
- ドーパミンD2/3受容体の核アキュンベンスの可用性を測定するためにポジトロン放出トモグラフィー (PET) を採用した.
- コカインの自己投与率と受容体の利用可能性と相関する衝動性の測定値.
主要な成果:
- 衝動的なネズミは,静脈内コカインの自己投与率が著しく高かった.
- ドーパミンD2/3受容体の可用性の低下は,コカインに曝露される前に衝動性ラットの核アキュンベンスで観察されました.
- これらの受容体の変化は,ドーパミンの放出とは無関係であった.
結論:
- 特質の衝動性は,コカイン強化の重要な予測因子である.
- 刺激剤依存症の個体におけるドーパミンD2受容体の機能不全は,前症候群の特徴の影響を受けることがあります.
- これらの発見は,中毒の脆弱性における既にある神経生物学的要因の役割を強調しています.
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