スプライシング因子FUSはMDM2をアップレギュレーションすることによりPIT1系統PitNETの進行を促進する
Xu Wang1,2,3, Jiang Li1,2, Chenggang Jiang1,2
1Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100070, China.
Theranostics
|January 9, 2026
まとめ
スプライシング因子FUSは、MDM2スプライシングを調節することにより、下垂体腫瘍の増殖を促進する。アンチセンスオリゴヌクレオチドを用いたこのプロセスの標的化は腫瘍の進行を停止させ、PIT1系統下垂体神経内分泌腫瘍の新たな治療戦略を提供する。
科学分野:
- 腫瘍学
- 分子生物学
- 遺伝学
背景:
- スプライシング因子はmRNA処理に不可欠であり、腫瘍の進行と関連している。
- 異常なスプライシング因子の発現は、下垂体神経内分泌腫瘍(PitNET)の浸潤性と相関している。
- 本研究では、PIT1系統PitNETの進行におけるスプライシング因子の役割を調査する。
研究 の 目的:
- スプライシング因子がPIT1系統PitNETの進行に果たす役割を探求すること。
- PitNETの治療戦略としてスプライシングを標的化することを評価すること。
- PitNETの発達におけるFUSの機能を解明すること。
主な方法:
- 40の臨床PitNETサンプルを用いた遺伝子発現解析。
- FUS媒介スプライシングを研究するためのトランスクリプトームおよびRNA免疫沈降シーケンス(RIP-seq)。
- スプライシングとアポトーシスを検証するためのミニジーンアッセイ、Annexin V/PI、およびJC-1染色。
主要な成果:
- PIT1系統PitNETにおけるFUSの発現上昇は、増殖率の上昇とアポトーシスの低下と相関していた。
- FUSノックダウンはエクソンスキッピングを誘導し、p53経路を活性化した。
- FUSはエクソン3の包含を介してMDM2の完全長転写産物を促進し、p53を阻害する。
結論:
- FUSはPitNETの進行における重要なスプライシング因子である。
- FUS媒介MDM2スプライシングを標的化することで、p53レベルを回復させ、PitNETの増殖を抑制できる。
- これは、PIT1系統PitNETに対する新たな治療戦略を提供する。
関連する概念動画
Abnormal Proliferation
5.1K
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...
5.1K
Restarting Stalled Replication Forks
6.3K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
6.3K
The Spindle Assembly Checkpoint
3.7K
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
3.7K
Interactions Between Signaling Pathways
7.2K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
7.2K
RNA Splicing
60.3K
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...
60.3K
Separation of Sister Chromatids
4.3K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
4.3K


