激活SIRT1通过TGF-β/Smad2/3通路抑制角膜内皮 - 介质细胞过渡
Yi Yu1, Ruilin Guo1, Jie Ling1
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou 510060, China.
Current issues in molecular biology
|December 27, 2024
概括
赛尔图因-1 (SIRT1) 激活通过调节转化生长因子-β (TGF-β) /Smad2/3通路来抑制角膜内皮-介质细胞过渡 (EnMT). 这一发现表明SIRT1激活是角膜内皮功能障碍的潜在治疗标.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 内皮 - 介质细胞过渡 (EnMT) 通过影响角膜内皮细胞 (CECs) 来损害角膜清晰度.
- 转变生长因子-β (TGF-β) 信号通路与 CEC 的 EnMT 有关.
- 赛尔图因-1 (SIRT1) 作为TGF-β/Smad2/3通路的抑制剂.
研究的目的:
- 研究SIRT1激活对角膜EnMT的抑制作用.
- 探索SIRT1在角膜内皮中的TGF-β/Smad2/3通路中的作用.
- 评估SIRT1激活作为角膜内皮功能障碍的潜在治疗策略.
主要方法:
- 在大鼠角膜损伤模型和TGF-β1治疗的人类CEC中诱导EnMT.
- 使用复星 (RSV) 和EX527.使用SIRT1活性调节.
- 通过免疫光和西欧斑点对内皮和介质细胞标记物的评估.
- 同免疫沉以确定SIRT1和Smad2/3的相互作用.
主要成果:
- 通过RSV激活的SIRT1促进了角膜透明度的恢复,并在体内减少了.
- 在体内和体外,RSV激活的SIRT1下调的介质细胞标记物 (α-SMA,维丁,Snail) 和上调的内皮细胞标记物 (E-cadherin,Na+/K+-ATPase).
- 通过EX527抑制SIRT1可以逆转这些效应.
- SIRT1调节TGF-β受体1和酸化Smad2/3表达,并与Smad2/3.3相互作用.
结论:
- 通过SIRT1激活,可以有效地抑制角膜EnMT.
- 该机制涉及TGF-β/Smad2/3通路的调节.
- 激活SIRT1为角膜内皮功能障碍提供了一个有希望的治疗途径.
相关概念视频
TGF - β Signaling Pathway
7.2K
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...
7.2K
PI3K/mTOR/AKT Signaling Pathway
3.4K
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...
3.4K
mTOR Signaling and Cancer Progression
3.7K
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...
3.7K
Regulation of Angiogenesis and Blood Supply
2.5K
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...
2.5K


