ドーパミンD2受容体の2つの同型体の異なる機能
A Usiello1, J H Baik, F Rougé-Pont
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS, INSERM, ULP, Illkirch, C.U. de Strasbourg, France.
Nature
|November 23, 2000
まとめ
ドーパミンD2受容体は,異なる役割を持っています:D2Lはポストシナプスであり,抗精神病薬によって標的にされ,D2Sはプレシナプス的に作用し,D1受容体の機能を抑制します. これは,神経精神疾患の新たな治療標的を明らかにしています.
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:
- ドーパミンD2受容体は,移動,ホルモン放出,報酬経路を含む重要な生理学的機能を調節する.
- これらの受容体は,統合失調症やその他の神経精神疾患の治療に使用される抗精神病薬の主要な標的である.
- D2受容体遺伝子の代替スプライシングにより,D2ショート (D2S) とD2ロング (D2L) の2つの同型が生成され,以前は機能的に同一であると信じられていた.
研究 の 目的:
- D2SおよびD2Lドーパミン受容体イソフォームの独特のインビボ機能を調査する.
- D2LとD2Sがそれぞれシナプス前とシナプス後のシグナル伝達における特定の役割を決定する.
- 抗精神病薬の作用とドーパミン受容体の回路に対する同型特異的機能の影響を調査する.
主な方法:
- D2L欠乏マウスモデルの生成と分析.
- 野生型およびノックアウト型マウスにおけるカタレプシーを含む運動行動の評価.
- ハロペリドールのような抗精神病薬剤による薬理学的挑戦.
- ドーパミン受容体のシグナル伝達相互作用の調査,特にD2S受容体とD1受容体の間の相互作用.
主要な成果:
- D2L受容体は主にポストシナプス部位で機能し,ハロペリドールなどの抗精神病薬に対する反応を媒介する.
- D2S受容体は,ドーパミンの放出を調節するプレシナプス自己受容体として機能します.
- D2L欠乏マウスは,ハロペリドール誘発のカタレプシーの欠如を示し,D2Lが主要な標的であることを示しています.
- D2L機能の喪失は,D1受容体媒介のシグナル伝達におけるD2Sの抑制作用を明らかにし,ドーパミン受容体タイプ間のクロストークを明らかにします.
結論:
- ドーパミンD2受容体イソフォームであるD2LとD2Sは,体内では異なる非冗長な機能を有する.
- D2Lは,ハロペリドールなどの抗精神病薬の重要なポストシナプス標的であり,標的治療の可能性を秘めている.
- D2SとD1受容体の相互作用は,治療上の意味を持つドーパミン受容体シグナル干渉の新しいメカニズムを強調しています.
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