ミオシンの役割 脊椎閉塞中のアムニオセロサ細胞のデラミネーションを誘発し実行する
Nicole Gorfinkiel1, Yanara Ferrer2, Jon Recalde2
1Departamento de Genética, Fisiología y Microbiología, Facultad de Ciencias Biológicas, Universidad Complutense de Madrid, Madrid, 28040, Spain. ngorfink@ucm.es.
Scientific reports
|September 1, 2025
まとめ
ミオシンの収縮性は,ドロソフィラの発達中に上皮細胞の除去を促す. このプロセスは組織再構成と形態変異に不可欠であり,カスパースの活性化を含み,細胞内部の要因と環境要因の両方が影響します.
科学分野:
- 発達生物学
- 細胞生物学
- 分子生物学
背景:
- アポトーシスによる細胞除去を含む形質変異には,上皮組織の再編成が不可欠である.
- ドロソフィラ・アムニオセロサは 背中を閉じる過程で 重要な再形成と除去を 経験する.
- アムニオセロサにおけるアポプトティック・デラミネーションの細胞メカニズムは十分に理解されていません.
研究 の 目的:
- ドロソフィラ・アムニオセロサの細胞分層過程におけるアクトミオシン動態を調査する.
- 非筋肉のミオシン活動が細胞の分層化を誘発し実行する役割を分析する.
- 細胞の自律的なミオシンダイナミクスと 組織のメカニカルシグナルとの相互作用を探求する.
主な方法:
- アクトミオシンの動態を研究した.
- 筋肉以外のミオシンの活性が全身および局所的に動乱した.
- ミオシン誘発デラミネーションにおけるカスパース活性化の役割を分析した.
主要な成果:
- ミオシンは細胞の分層化を開始し実行する上で重要な役割を果たします.
- 高ミオシンの収縮性は,カスパースの活性化によって細胞のデラミネーションを促進する.
- 細胞分層は,細胞自律的なミオシン活動と,機械的な環境シグナルによって調節されます.
結論:
- 非筋肉のミオシンの収縮性は,上皮の再構築中のアポプトシス細胞除去の主要な調節因子である.
- 皮質細胞の剥離は,細胞内および細胞外の両方の機械信号の影響を受ける複雑なプロセスです.
- 発見はアポトーシスと組織形態変異の調節に関する新しい洞察を提供します.
関連する概念動画
01:16Cell Motility through Blebbing
2.0K
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...
2.0K
01:18Role of Myosin in Cell Migration
2.4K
Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
Myosin II is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
2.4K
01:31Mechanism of Lamellipodia Formation
2.7K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
2.7K
02:15The Contractile Ring
6.5K
Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
6.5K
01:10The Role of Actin and Myosin in Non-muscle Cells
3.6K
Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They are held...
3.6K
01:39Mechanism of Filopodia Formation
2.5K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.5K