p73は,DNA損傷に対するアポプトティック反応においてチロシンキナーゼc-Ablによって調節される
1Department of Cancer Cell Biology, Harvard School of Public Health, Dana Farber Cancer Institute, Boston, Massachusetts 02115, USA.
Nature
|July 3, 1999
まとめ
タイロシンキナーゼc-Ablはp73タンパク質に結合し,リン酸化し,アポトーシスにおけるその役割を刺激する. この相互作用は,DNA損傷によって引き起こされる細胞死にとって極めて重要であり,p73.3のための新しい調節経路を強調しています.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 腫瘍学 腫瘍学
背景:
- p73はp53の腫瘍抑制剤の同型ですが,DNA損傷によって誘発されません.
- タイロシンキナーゼc-AblはDNA損傷によって活性化され,p53-依存および独立経路を通じてアポトーシスを促進します.
研究 の 目的:
- c-Ablとp73.3の相互作用を調査する.
- DNA損傷に対する反応としてc-Ablがp73の活性を調節するかどうかを判断する.
主な方法:
- 細胞内のc-Abl/p73結合を検出するための共免疫プレシピテーション.
- イオン化する放射線を用いたインビトロおよび細胞内リン酸化アッセイ.
- p73媒介のトランザクティベーションとアポトーシスを測定するためのアッセイ.
主要な成果:
- c-Ablは,SH3ドメインとp73のカーボキシ末端ドメインを通じてp73に結合する.
- c-Ablは,電離放射線への反応としてチロシン99でp73をリン酸化します.
- c-Ablはp73媒介のトランザクティベーションとアポトーシスを強化する.
- c-Abl-p73相互作用の障害は,電離放射線誘発によるアポトーシスを損なう.
結論:
- p73はc-Abl依存メカニズムによって制御される.
- p73は,DNA損傷に対するアポプトシス反応において役割を果たします.
- c-Abl-p73の相互作用は,DNA損傷によって引き起こされるアポトーシスにとって非常に重要です.
関連する概念動画
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.
Base Excision Repair
One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
The first step of...
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...
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...
Nucleotide Excision Repair
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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...


