P75は,Nogo,MAG,OMgppの共受容体として,Nogo受容体と相互作用する
Kevin C Wang1, Jieun A Kim, Rajeev Sivasankaran
1Division of Neuroscience, Children's Hospital and Program in Neuroscience, Harvard Medical School, 320 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|November 8, 2002
まとめ
Nogo-Aのようなミエリン阻害剤は,Nogo受容体 (NgR) 経由で神経の成長を阻害する. p75タンパク質はNgRと相互作用し,この阻害のための重要な信号変換器として作用します.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
背景:
- いくつかのミエリン成分は,Nogo受容体 (NgR) を通してシグナルを送り,ニューライトの増殖を阻害する.
- グリコシル・フォスファティディル・イノシトール (GPI) に固定されたNGRは,信号をニューロンに伝達するために共受容体を必要とします.
研究 の 目的:
- 信号伝達のためにNgRと相互作用するトランスメブランタンパク質を識別する.
- ミエリン由来ニューライトの増殖抑制を媒介するp75の役割を調査する.
主な方法:
- p75-NgRの相互作用を証明するための共免疫プレシピテーション.
- P75ノックアウトマウスを用いたニューロン応答アッセイ.
- 主要ニューロンにおける切断されたp75タンパク質による機能研究.
主要な成果:
- p75は特にNogo受容体 (NgR) と相互作用する.
- p75 が欠けているニューロンは,ミエリン阻害剤とNgRリガンドに反応しない.
- p75-NgRの相互作用を遮断したり,断絶されたp75を過剰に発現させたりすると,抑制信号が弱まります.
結論:
- p75は,NGR媒介による神経細胞増殖の抑制のための信号トランスデューサーとして機能します.
- p75-NgR複合体を標的にすることは,中枢神経系における軸索再生を促進するための潜在的な治療戦略を提供します.
関連する概念動画
G-protein Coupled Receptors
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Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
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Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
G-protein Coupled Receptors
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
Assembly of Signaling Complexes
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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G Protein-coupled Receptors
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
G Protein-coupled Receptors
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...


