拉特罗菲林-2通过内分泌素和Shank3调节内皮细胞流介导的Smad1/5激活
bioRxiv : the preprint server for biology
|July 9, 2025
概括
液体剪切应力通过拉特罗菲林-2 (Lphn2) 和Shank3在内皮细胞中激活Smad1 / 5,独立于G蛋白信号传递. 这一途径对血管平衡至关重要,并可能影响周围动脉疾病风险.
科学领域:
- 血管生物学 血管生物学
- 细胞信号传递 细胞信号传递
- 机械传导的分子机制.
背景情况:
- 流体剪切应力 (FSS) 对血管稳定性和重塑至关重要.
- 由FSS通过BMP9/10受体激活的Smad1/5通路促进了血管平衡.
- 之前已知拉特罗菲林-2 (Lphn2) 可以调节结合体复合体的流动激活.
研究的目的:
- 调查拉特罗菲林-2 (Lphn2) 在内皮细胞中流媒Smad1/5激活中的作用.
- 为了确定Lphn2的下游介质,以应对流体剪切应力.
- 探索这种途径与心血管疾病之间的潜在联系.
主要方法:
- 内皮细胞培养和刺激与层状剪切应力.
- Lphn2和内分泌素共免疫沉和近距离标签 (APEX2).
- 在细胞培养 (Shank3敲除) 和体内 (内皮特异性Lphn2敲除小鼠,Shank3敲除小鼠,斑马鱼胚胎) 中进行基因操纵.
- 对于Smad1/5激活和核转位的西方涂抹.
主要成果:
- 对于通过层切应力通过流介导的Smad1/5激活,Lphn2是必要的,但不是通过可溶性BMP9.
- 在内皮结处,Lphn2与Endoglin结合,独立于G蛋白信号传递,调解Smad1/5激活,需要其PDZ结合动机.
- 在小鼠中的内皮特异性Lphn2淘汰和斑马鱼胚胎中的Lphn2淘汰减少了Smad1/5激活.
- 在APEX2标签中,Shank3被确定为Lphn2.2的流量依赖的结合伙伴.
- 在体外和体内,Shank3敲击和敲击减少了流动诱导的Smad1/5激活.
结论:
- 在内皮细胞中,Lphn2通过Shank3调解了G蛋白独立的,流动诱导的Smad1/5激活.
- 这种Lphn2-Shank3通路对于调节内皮Smad1/5激活以应对血液流动至关重要.
- 罕见的Shank3变体与降低外围动脉疾病风险有关,这表明这种途径在心血管疾病中的相关性.
更多相关视频
09:20The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
Published on: October 31, 2016
8.2K
12:55A Microphysiological System to Study Leukocyte-Endothelial Cell Interaction during Inflammation
Published on: December 9, 2021
3.4K
相关概念视频
Regulation 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
Intracellular Signaling Affects Focal Adhesions
2.8K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.8K
Mechanism of Filopodia Formation
2.5K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.5K
TGF - β Signaling Pathway
7.7K
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...
7.7K
Mechanism of Lamellipodia Formation
2.8K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
2.8K
The JAK-STAT Signaling Pathway
9.3K
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...
9.3K
