スプライシングファクターYBX1は,JAK2変異性腫瘍の持続を媒介する
Ashok Kumar Jayavelu1, Tina M Schnöder2,3, Florian Perner2
1Max Planck Institute of Biochemistry, Munich, Germany.
Nature
|November 26, 2020
まとめ
変異したJAK2が 骨髄増殖性腫瘍を誘発する JAK2の標的であるYBX1を JAK2阻害剤と共に無活性化すると,JAK2変異細胞のアポトーシスと寛解が誘発されます.
科学分野:
- 血液学
- 分子生物学
- 癌 生物学
背景:
- ジャヌスキナーゼ (JAKs) は細胞シグナル伝達に不可欠であり,JAK2変異は骨髄増殖性腫瘍 (MPNs) を誘発する.
- 現在のJAK阻害剤は,JAK2変異のクローンを根絶する効果が限られており,疾患の持続メカニズムに関する研究が必要である.
研究 の 目的:
- JAK2変異のクローンの持続の基礎となる分子メカニズムを調査する.
- MPNにおけるJAK阻害剤の有効性を高める新しい治療標的を特定する.
主な方法:
- 変異したJAK2の標的を特定するための深層のフォスフォプロテオームプロファイリング.
- JAK2変異細胞と動物モデルにおけるYBX1不活性化とJAK阻害に関する機能研究.
- RNA スプライシング,転写制御,細胞外シグナル調節キナーゼ (ERK) 信号の分析.
主要な成果:
- YBX1を含むmRNA処理に関与するタンパク質は,変異したJAK2の標的として特定されました.
- YBX1の不活性化により,アポトーシスに対する持続的な細胞が敏感になり,RNAのミススプライシングを引き起こし,ERKのシグナル伝達が妨げられました.
- JAK抑制とYBX1不活性化の組み合わせは,アポトーシス,悪性クローン回帰,および分子寛解をインビボで引き起こした.
結論:
- 変異したJAK2によるYBX1の差分タンパク質リン酸化は,JAK2- ERKシグナル伝達におけるスプライシング依存の変化に寄与し,悪性クローンを維持する.
- JAK2阻害と組み合わせたYBX1依存のERKシグナリングをターゲットにすることは,JAK2変異細胞を根絶するための潜在的な戦略を提供します.
さらに関連する動画
12:40A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors
Published on: December 7, 2014
15.1K
11:32Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter
Published on: March 27, 2020
7.2K
関連する概念動画
The JAK-STAT Signaling Pathway
10.6K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
10.6K
RNA Splicing
59.4K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
59.4K
Induced Pluripotent Stem Cells
4.9K
Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
Somatic...
Somatic...
4.9K
Induced Pluripotent Stem Cells
25.8K
Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
25.8K
Loss of Tumor Suppressor Gene Functions
5.5K
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...
5.5K
Long-patch Base Excision Repair
7.6K
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
7.6K
