GDNFの機能的受容体は,c-retプロトオンコゲン遺伝子によってコードされています
M Trupp1, E Arenas, M Fainzilber
1Laboratory of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden.
Nature
|June 27, 1996
まとめ
膠質細胞系由来ニュートロフィック因子 (GDNF) はRet受容体チロシンキナーゼと結合し,神経栄養効果を媒介する. これは,Retを機能的なGDNF受容体として識別し,モーターおよびドーパミナージックニューロンの生存に不可欠です.
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.
- 細胞生物学 細胞生物学
背景:
- 膠質細胞系派生中性因子 (GDNF) は,ドーパミンやモーターニューロンを含む様々なニューロンの生存をサポートします.
- GDNF受容体は,神経栄養的な役割にもかかわらず,未確認のままでした.
- GDNFは,TGF-βスーパーファミリーと構造的類似性を共有しており,受容体系を示唆しています.
研究 の 目的:
- グリアル細胞系由来ニュートロフィック因子 (GDNF) の機能的受容体を特定する.
- GDNFの神経栄養効果を媒介するc-retプロトオンコゲン製品の役割を調査する.
主な方法:
- GDNFに反応するモーターニューロン細胞系を用いたバインディングアッセイとチロシンリン酸化試験.
- GDNF媒介反応を評価するために,ネイブ線維芽細胞をRetで感染させる.
- 大人の substantia nigraにおけるc-ret mRNA発現の分析と,Ret陽性ニューロンに対するGDNFの保護効果.
主要な成果:
- GDNFは,レセプターチロシンキナーゼであるRetプロトオンコゲン産物のチロシンリン酸化を直接結合し,誘導する.
- Retは,GDNF誘発の生存および成長信号を,ネイブ細胞で発現すると,媒介する.
- c-ret mRNAはドーパミナージックニューロンに高度に発現し,GDNFはこれらのRet陽性ニューロンを細胞死から保護します.
結論:
- c-retプロトオンコゲン産物は,GDNF受容体として機能する.
- Retは,GDNFがモーターニューロンとドーパミナージックニューロンに与える神経栄養効果を媒介する.
- この発見は,これらのニューロン集団に影響を与える神経変性疾患を理解し,潜在的に治療するための分子標的を提供します.
関連する概念動画
Enzyme-linked Receptors
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Enzyme-linked Receptors
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
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 are ligand-binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that traverses 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 hold onto the G-protein.The G-protein, or guanine nucleotide-binding protein, is a large heterotrimeric complex. Its three subunits...
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...
Transducer Mechanism: G Protein–Coupled Receptors
G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical, 7TM, or...
GPCRs are also called heptahelical, 7TM, or...


