alphaE-cateninは,ヘッジホッグのシグナル伝達経路を調節することによって,脳皮質の大きさを制御します
Wen-Hui Lien1, Olga Klezovitch, Tania E Fernandez
1Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
まとめ
中枢神経系におけるアルファE-カタニンの消去は,ヘッジホッグ経路を活性化し,脳の過剰成長につながります. これは,アルファE-カテニンが通常,負のフィードバックループを通じて脳のサイズを調節することを示唆しています.
科学分野:
- 神経発達生物学 神経発達生物学とは
- 細胞生物学 細胞生物学
- 分子遺伝学 分子遺伝学
背景:
- 細胞の蓄積率は,臓器の発達とサイズ決定に極めて重要です.
- アデレンス結合は,細胞間の結合と組織組織において重要な役割を果たします.
- ヘッジホッグのシグナル伝達経路は,胚の発達の主な調節器である.
研究 の 目的:
- 中枢神経系の発達におけるalphaE-cateninの役割を調査する.
- アデレンス交差点とヘッジホッグ経路の間のつながりを解明する.
- 脳皮質の大きさを制御するメカニズムを理解するために.
主な方法:
- 発達モデルにおけるアルファE-カテニンの中枢神経系特異的な遺伝子消去.
- 細胞サイクルダイナミクスとアポトーシス速度の分析.
- ヘッジホッグ経路の活性化と,交差点の整合性を保持する.
主要な成果:
- alphaE-cateninの削除は異常なヘッジホッグ経路の活性化につながった.
- 細胞サイクルの短縮とアポトーシスの減少が観察されました.
- その結果,発達中の脳の有意な皮質増殖 (過剰成長) が起こりました.
結論:
- AlphaE-cateninは,細胞密度に依存するアデレンス接合点と,ヘッジホッグの発達経路の間の重要なリンクとして機能します.
- この相互作用は,脳皮質の大きさを制御する潜在的ネガティブなフィードバックメカニズムを形成します.
- この経路の不調は,脳の大きさの発達異常につながる可能性があります.
関連する概念動画
Cell Motility through Blebbing
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
Catenins
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Cadherins in Tissue Organization
The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
Cell Sorting During Development
Cell sorting plays an...
Tension Response at Adherens Junctions
The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...


