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関連する概念動画

Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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The Nucleus01:25

The Nucleus

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...
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Energy to Drive Translocation01:37

Energy to Drive Translocation

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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
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The Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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関連する実験動画

Updated: Sep 9, 2025

Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
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ミトコンドリアは圧迫された核を動かす

Meng Yao1, Yao Zong2, Junjie Gao1

  • 1Institute of Microsurgery on Extremities, And Department of Orthopedic Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200233, China.

Mechanobiology in medicine
|September 2, 2025
PubMed
まとめ

機械的なストレス下にある細胞はミトコンドリアを原子核の周りに急速に配置し,核関連ミトコンドリア (NAM) を形成する. この適応は核のATP生成を促進し DNA修復と細胞生存のためのクロマチンのアクセシビリティを保ちます

キーワード:
機械的な閉じ込めミトコンドリア動態核ATPについて

さらに関連する動画

Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology
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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
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科学分野:

  • 細胞生物学
  • バイオ物理学
  • 分子生物学

背景:

  • 細胞の侵入と密輸の際に 機械的な閉じ込めは 核の完全性を脅かします
  • 細胞は身体的ストレスに 適応するメカニズムを持っています

研究 の 目的:

  • ミトコンドリア核が 機械的ストレス下での位置転換の 生物学的意義について解説します
  • クロマチン状態とDNA修復の維持における核ATPの役割について議論する.
  • 細胞の発達と病気への影響を調査する.

主な方法:

  • 閉じ込められた核へのミトコンドリアの移転の観察.
  • ミトコンドリアのクラスタリングにおけるエンドプラズマ網とアクチンフィラメントの関与の分析.
  • 核内のATPレベルを評価する.

主要な成果:

  • ミトコンドリアは,閉じ込められたときに核の周りに急速に集まって (核関連ミトコンドリア,NAMを形成する).
  • エンドプラズマの網膜とアクチン繊維はNAMを捕まえて局所的なATPの急増を引き起こします
  • 核ATPはクロマチンのアクセシビリティと DNAの損傷修復を促進し 細胞増殖を保証します

結論:

  • ミトコンドリア核の位置転換は 機械的ストレスに対する 重要な適応反応です
  • 局所的な核ATPは,核の機能と細胞の活性を維持するために不可欠です.
  • このメカニズムは,生理学的および病理学的文脈で細胞の適性を理解するための広範な意味を持つ.