LKB1の喪失は,セリン代謝とDNAメチル化と腫瘍発生を結びつける
Filippos Kottakis1,2,3, Brandon N Nicolay1,3, Ahlima Roumane1,2,3
1Cancer Center, Massachusetts General Hospital, 185 Cambridge Street, Boston, Massachusetts 02114, USA.
Nature
|November 4, 2016
まとめ
LKB1腫瘍抑制剤の喪失は 代謝と表遺伝子を変化させることで 癌を助長します これは標的型療法に対する脆弱性を作り出し,LKB1変異がんに対する新しい治療戦略を提供します.
科学分野:
- 腫瘍学
- 代謝経路
- エピジェネティクス
背景:
- 中間代謝は,代謝状態と表遺伝状態を結びつけるクロマチンの改変のための基板を提供します.
- 肝臓キナーゼB1 (LKB1/STK11) 腫瘍抑制剤は栄養素の供給,代謝,成長を統合する.
- LKB1の喪失は腫瘍性変異に 関わっている.
研究 の 目的:
- LKB1欠乏性がんにおける代謝と表遺伝子変化を結びつけるネットワークを特定する.
- LKB1変異の腫瘍発生におけるセリン-グリシン-一炭素経路とS-アデノシルメチオニンの役割を調査する.
- メタボリック・エピジェネティック・リプログラミングに伴う 治療の脆弱性を調べる
主な方法:
- 遺伝子組み換えマウスモデルと 主要な臓上皮細胞
- トランスクリプション,プロテオミクス,代謝分析.
- DNAメチルトランスフェラーゼとレトロトランポゾンメチル化の研究
主要な成果:
- KRASの活性化と結合したLKB1の喪失は,mTOR依存のセリン・グリシン・ワン・カーボン経路を誘導し,S-アデノシルメチオニンを増加させます.
- DNAメチルトランスフェラーゼの上昇は,特にレトロトランポゾンでのDNAメチル化の増加につながります.
- LKB1欠乏細胞と腫瘍は,セリン生物合成とDNAメチル化の抑制に敏感である.
結論:
- LKB1の喪失によって引き起こされる高代謝状態は,腫瘍形成を促進するために表遺伝的環境を変化させます.
- この代謝-表遺伝的再プログラムにより,LKB1変異がんの治療上の脆弱性が生じる.
- セリン生物合成やDNAメチル化をターゲットにすることが効果的な治療戦略である.
さらに関連する動画
10:09Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark
Published on: January 26, 2018
8.0K
13:47Enhanced Reduced Representation Bisulfite Sequencing for Assessment of DNA Methylation at Base Pair Resolution
Published on: February 24, 2015
26.5K
関連する概念動画
Epigenetic Regulation
4.1K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
4.1K
Epigenetic Regulation
34.1K
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
34.1K
Loss of Tumor Suppressor Gene Functions
6.2K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
6.2K
Loss of Tumor Suppressor Gene Functions
2.0K
2.0K
Abnormal Proliferation
5.4K
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...
5.4K
Base Excision Repair
27.3K
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...
27.3K
