関連する実験動画
Updated: May 31, 2026

07:47
Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
Published on: May 10, 2022
メタフェーズスピンドルのマイクロメカニカル特性に関する洞察
Yuta Shimamoto1, Yusuke T Maeda, Shin'ichi Ishiwata
1Laboratory of Chemistry and Cell Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.
Cell
|June 28, 2011
まとめ
メタフェーズ・スピンドル
科学分野:
- 細胞生物学 細胞生物学
- バイオフィジックス 生物物理学
- 細胞骨格のダイナミクス
背景:
- ダイナミックなマイクロチューブル構造であるメタフェーズ・スピンドルは,細胞分裂に不可欠です.
- その微力学的性質と力への反応は十分に理解されていないため,その安定性の説明を妨げています.
- スピンドルメカニズムを理解することは,染色体分離と細胞周期調節を理解する鍵です.
研究 の 目的:
- 脊椎動物のメタフェーズスパインドルの粘弾性特性を調査するために.
- タイムスケールと力方向がスパインドル力学にどのように影響するか判断する.
- スピンドルのマイクロメカニクスに関する定量モデルを開発する.
主な方法:
- 精密な力の適用と測定のために,力校正された針を使用しました.
- 高解像度顕微鏡を用いて,スパインドル構造を可視化しました.
- 微小管の性質を調節するために生化学的混乱を適用した.
主要な成果:
- スピンドルの粘性は,微小管のクロスリンクと密度に依存しています.
- スピンドルの弾力性は,微小管の剛性とスピンドルの極の組織によって影響されます.
- キネシン5とダイネインを含む,スパインドルの弾性を維持する重要な分子プレーヤーを特定した.
結論:
- メタフェーズスピンドルの微力学に関する定量モデルを開発した.
- スピンドルの構造と機能の安定性を力の下で維持する方法についての洞察を提供しました.
- スピンドルのマイクロメカニズムは,スピンドルの位置づけや染色体移動などの重要な細胞プロセスと結びついています.
関連する概念動画
The Mitotic Spindle
The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The Mitotic Spindle
The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
Forces Acting on Chromosomes
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...
Spindle Assembly
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
The Spindle Assembly Checkpoint
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...

