在内皮细胞中,TNF诱导了Laminin-332-编码基因,而Laminin-332促进了无源内皮表型
Assim Hayderi1, Mulugeta Melkie Zegeye1, Sare Meydan1
1Cardiovascular Research Centre, Department of Medical Sciences, School of Medicine, Örebro University, 70362 Örebro, Sweden.
International journal of molecular sciences
|August 29, 2024
概括
瘤坏死因子-α (TNF) 增加了内皮细胞中的拉米宁-332 (LN332) 基因表达. LN332损害了内皮的完整性,并促进了白细胞的粘附,这表明它在动脉样硬化中发挥了作用.
科学领域:
- 细胞生物学 细胞生物学
- 血管生物学 血管生物学
- 生物化学 生物化学
背景情况:
- 层蛋白是关键的底层膜蛋白,具有组织特异性的表达.
- 炎症期间血管中发生变化的拉米林组成,如动脉样硬化.
- 瘤坏死因子-α (TNF) 是动脉样硬化病变中的一个关键的促炎细胞因子.
研究的目的:
- 为了研究TNF对内皮内胺基因表达的影响.
- 为了确定拉米宁-332 (LN332) 对内皮细胞行为的影响.
- 评估LN332编码基因表达在人类大脑动脉样硬化斑块.
主要方法:
- 对TNF的反应中LAMB3和LAMC2 (LN332成分) 的量化基因表达.
- 在复合LN332上培养了内皮细胞,以观察表型变化.
- 分析了LN332基因表达和TNF相关性在人类心血管斑块.
主要成果:
- 在内皮细胞中TNF上调LAMB3和LAMC2基因表达.
- 在LN332上的内皮细胞显示了减少的Claudin-5,松散的连接,以及增加的白细胞粘附分子.
- 在人体斑块中,LAMB3和LAMC2被上调,与TNF水平呈正相关性.
结论:
- 在人体内皮细胞中,TNF刺激LN332基因表达.
- LN332促进了一个内皮表型,其完整性受到损害,白细胞相互作用增加.
- 底层膜蛋白,特别是LN332,可能在动脉样硬化病变发生过程中发挥重要作用.
相关概念视频
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
Laminins are the Adhesive Proteins of Basal Lamina
2.1K
Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
2.1K
TGF - β Signaling Pathway
7.3K
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...
7.3K
NF-κB-dependent Signaling Pathway
7.4K
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The...
NF-κB-dependent Signaling Mechanism
The...
7.4K
Intracellular Signaling Affects Focal Adhesions
2.6K
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...
2.6K
Non-Canonical Wnt Signaling Pathways
7.3K
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
7.3K


