様々な心理模倣薬は,共通のシグナル伝達経路を介して作用する
Per Svenningsson1, Eleni T Tzavara, Robert Carruthers
1Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, NY 10021, USA.
Science (New York, N.Y.)
|November 25, 2003
まとめ
様々な薬によって誘発される統合失調症のような行動は,DARPP-32.2を含む共通の経路によって媒介されます. DARPP-32の遺伝子または分子変異は,マウスの薬物誘発による行動変化を著しく減少させた.
科学分野:
- 神経科学は神経科学である.
- 薬理学 薬理学とは
- 分子生物学は分子生物学である.
背景:
- ドーパミナージック,セロトナージック,グルタマタージック剤を含む異なる薬物クラスは,動物モデルで統合失調症の症状に似た精神相似状態を誘発することができます.
- これらの薬物誘発状態の基礎にある共通の分子機構を特定することは,統合失調症の病理生理学を理解するために重要である.
研究 の 目的:
- D-アンフェタミン,LSD,PCPの心理的作用を媒介する共有信号経路を調査する.
- これらの薬物誘発行動における32キロダルトン (DARPP-32) のドーパミンおよびアデノシン3',5'-モノフォスファート (cAMP) 調節されたフォスフォタンパク質 (DARPP-32) の役割を決定する.
主な方法:
- DARPP-32が欠けているか,またはそのリン酸化部位に点変異がある遺伝子組み換えマウスを利用した.
- D-アンフェタミン,LSD,PCPを投与し,センサーモーターゲートと繰り返しの動きへの影響を評価した.
- DARPP-32のリン酸化状態と,タンパク質フォスファタゼ-1,GSK-3,CREB,c-Fos.などの下流エフェクターへの影響を調べました.
主要な成果:
- DARPP-32は3つの主要部位でリン酸化/脱リン酸化を施し,タンパク質フォスファタゼ-1. 1のシナギスティック阻害につながります.
- DARPP-32の遺伝的削除または変異は,D-アンフェタミン,LSD,PCPの行動効果を著しく弱めた.
- これらの発見は,DARPP-32が薬物誘発の心理模倣行動の重要な仲介者であることを示唆しています.
結論:
- 共通のシグナル伝達経路がDARPP-32に収束し,さまざまな心理模倣薬の行動効果を媒介する.
- DARPP-32は,統合失調症のような症状に関連した状態のための潜在的な治療目標を表しています.
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