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関連する概念動画

Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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関連する実験動画

Updated: May 7, 2026

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
10:24

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins

Published on: September 28, 2012

Bmi1はミトコンドリア機能とDNA損傷反応経路を調節する.

Jie Liu1, Liu Cao1, Jichun Chen2

  • 1Translational Medicine Branch, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.

Nature
|May 1, 2009
PubMed
まとめ

Bmi1 が欠けているマウスは,ミトコンドリアの機能が低下し,酸化ストレスが増加し,DNAの損傷を引き起こします. 抗酸化剤の治療またはDNA修復経路のブロックは,これらのBmi1欠乏したマウスを改善しました.

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High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution
10:47

High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution

Published on: May 5, 2023

関連する実験動画

Last Updated: May 7, 2026

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
10:24

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins

Published on: September 28, 2012

Visualization of DNA Repair Proteins Interaction by Immunofluorescence
07:55

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution
10:47

High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution

Published on: May 5, 2023

科学分野:

  • 幹細胞生物学 幹細胞生物学とは
  • 分子生物学は分子生物学である.
  • ミトコンドリアの機能

背景:

  • ポリコンブ・レプレッサーBmi1は,幹細胞の自己再生と発達に不可欠です.
  • Bmi1の欠乏は,Ink4a/Arfの位置の減圧につながり,発達異常を引き起こす.
  • これらのプロセスにおけるBmi1の役割の背後にある正確なメカニズムは完全に理解されていません.

研究 の 目的:

  • 細胞代謝とDNA損傷におけるBmi1の役割を調査する.
  • ミトコンドリア機能と活性酸素種 (ROS) に対するBmi1欠乏の影響を調査する.
  • ミトコンドリア機能障害やDNA損傷経路をターゲットにすることで,Bmi1欠乏症のフェノタイプを救うことができるかどうかを判断する.

主な方法:

  • Bmi1欠乏 (Bmi1(-/-)) のマウスから派生した細胞の分析.
  • ミトコンドリア機能と細胞内ROSレベルの評価.
  • N-アセチルシステイン (抗酸化剤) とChk2 (DNA損傷応答経路) の遺伝的消去による薬理学的治療.

主要な成果:

  • Bmi1(-/-) 細胞はミトコンドリア機能障害とROSレベル上昇を示します.
  • ROSの増加は,Bmi1欠乏細胞のDNA損傷反応経路を誘発する.
  • N-アセチルシステインの治療またはChk2の消去は,多くのBmi1 ((-/-) 関連欠乏症を改善しました.

結論:

  • Bmi1は,ミトコンドリア機能とリドックスホメオスタシスの維持に予期せぬ役割を果たします.
  • 細胞の代謝は,ポリコンブタンパク質によって,幹細胞と原始細胞の機能とともに調整されます.
  • ミトコンドリア機能障害とDNA損傷経路をターゲットにすることで,Bmi1に関連する疾患に対する潜在的な治療戦略を提供します.