P300は,RUNX1の転写を促進し,オートファギーを調節し,角膜新血管化を誘導する
Yangyang Peng1, Qing Wang1, Jingjing Xu1
1Ophthalmic Center, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, China.
Investigative ophthalmology & visual science
|August 27, 2025
まとめ
Runt関連転写因子1 (RUNX1) とP300は,オートファギーを阻害することによって角膜新血管化 (CoNV) を促進する. RUNX1を静止すると,オートファギーを活性化し,CovNVの進行と内皮細胞の活動を減少させます.
科学分野:
- 眼科について
- 分子生物学
- 細胞生物学
背景:
- 角膜新血管化 (CoNV) は,角膜における新しい血管の成長を含む病理的プロセスである.
- CoNVの分子調節因子を理解することは,効果的な治療法の開発に不可欠です.
- ラント関連転写因子1 (RUNX1) は血管新生における潜在的な重要な役割を果たしている.
研究 の 目的:
- 角膜新血管化 (CoNV) に関するRUNX1の調節作用を調査する.
- P300とオートファギーの関与を含む,根本的な分子メカニズムを解明する.
主な方法:
- RUNX1/ P300操作によるVEGF誘発ヒト静脈内皮細胞 (HUVEC) を用いたインビトロ研究.
- 細胞増殖 (EdU),移動 (Transwell) およびチューブ形成の測定
- タンパク質の相互作用を評価するために,クロマチン免疫プレシピテーション (ChIP) と共免疫プレシピテーション (Co- IP) を行う.
- RFP-GFP-LC3 レポーターを使用したオートファージ流量モニタリング
- アルカリによる燃焼による CoNV のラットモデルを用いた in vivo 検証.
主要な成果:
- CoNVおよびVEGF誘発のHUVECでは,RUNX1およびP300のレベルが上昇し,オートファギーの抑制と相関していました.
- P300はRUNX1プロモーターに直接結合し,RUNX1の転写を強化する.
- RUNX1の過剰発現はP300静止の抗血管新生効果を相殺した.
- RUNX1のノックダウンにより,VEGF誘発のHUVECの増殖,移動,およびチューブ形成が,オートファギーの活性化により弱まりました.
結論:
- P300は,そのプロモーターに結合することによってRUNX1の転写を強化する.
- RUNX1は,オートファジーに関連する遺伝子を調節することによって,CoNVの進行に重要な役割を果たします.
- RUNX1- P300- 自閉症軸をターゲットにすることは,CovNVの潜在的な治療戦略です.
関連する概念動画
01:24Regulation of Angiogenesis and Blood Supply
2.7K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
2.7K
02:23Abnormal Proliferation
4.6K
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...
4.6K
03:03mTOR Signaling and Cancer Progression
3.9K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.9K
01:22PI3K/mTOR/AKT Signaling Pathway
3.9K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.9K
01:16TGF - β Signaling Pathway
7.6K
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
7.6K
01:20The Retinoblastoma Gene
4.2K
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.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
4.2K