関連する実験動画
Updated: Jun 14, 2026

11:32
Nucleofection of Rodent Neuroblasts to Study Neuroblast Migration In vitro
Published on: November 13, 2013
ネズミのニューロブラストーマ細胞におけるニューライトの成長に先立つ微小管の開始部位の集積
Cell
|February 1, 1979
まとめ
神経芽細胞の細胞分化中に,マイクロチューブルの開始部位は劇的に変化します. 不分化細胞には複数の小さな部位があり,分化細胞は単一の大きな部位を形成し,マイクロチューブルの成長をニューライトに導きます.
科学分野:
- 細胞生物学 細胞生物学
- 神経科学は神経科学である.
- 細胞骨格のダイナミクス
背景:
- 微小管は細胞の構造と機能に不可欠です.
- 微小管の開始部位 (MTIS) は,微小管の組織化の主要な調節体です.
- MTISのダイナミクスを理解することは,細胞の分化と形態論を理解するために不可欠です.
研究 の 目的:
- ネズミのニューロブラストーマ細胞におけるMTISの構造と細胞内局所を調査する.
- 微分化ニューロブラストーマ細胞と未微分化ニューロブラストーマ細胞のMTISを比較する.
- 微分化中のニューライト形成におけるMTISの役割を明らかにする.
主な方法:
- 抗チューブリン抗体を用いた免疫光顕微鏡.
- マイクロチューブルの再生の分析.
- フェーズコントラストと微分干渉コントラスト顕微鏡.
主要な成果:
- 不分化ニューロブラストーマ細胞は,核の近くで約12個の小さなMTISを有し,放射線微小管の成長を開始します.
- 分化ニューロブラストーマ細胞は,ニューライトと並行して細胞体内に位置する単一の大きなMTIS (3-4μm) を表しています.
- この大きなMTISは,24時間前にニューライトの拡張を先導するより小さなサイトの集積から形成されたようです.
- 分化MTISからの微小管の成長は,神経細胞のプロセスに高度に指向しています.
結論:
- MTISの構造と位置における重大な変化は,神経芽細胞細胞の分化に伴います.
- 複数の小さなMTISから1つの大きなMTISへの移行は,神経細胞の成長にとって非常に重要です.
- MTISにおける同様の変化は,微分化の過程で他の細胞タイプにおける形態学的変化の根底にある可能性があります.
関連する概念動画
Microtubule Formation
Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation of...
Microtubule Associated Proteins (MAPs)
Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
Destabilization of Microtubules
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
Assembly of Complex Microtubule Structures
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
Microtubule Instability
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated assembly and...

