在内皮细胞中对ERK5转录活性进行TNIK驱动的调节
Venkata Subrahmanya Kumar Samanthapudi1, Sivareddy Kotla1, Nhat-Tu Le2
1Department of Cardiology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States.
Frontiers in cardiovascular medicine
|July 17, 2025
概括
交互Traf2和Nck激酶 (TNIK) 调节细胞外信号调节激酶5 (ERK5) 信号传递,影响血管平衡. TNIK通过MEK5依赖和独立的途径调节ERK5的转录活性,为血管疾病提供治疗潜力.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 心血管生物学 心血管生物学
背景情况:
- 细胞外信号调节激酶5 (ERK5) 对心血管发育和内皮细胞 (EC) 功能至关重要.
- 通过MEK5介导的化激活ERK5,驱动KLF2和KLF4的转录,这对血管平衡至关重要.
- 波纳替尼通过非正规机制抑制ERK5的转录活性,这表明其他激酶 (如TNIK) 也参与其中.
研究的目的:
- 研究Traf2-和Nck相互作用激酶 (TNIK) 在调节ERK5转录活性及其对血管平衡的下游影响中的作用.
- 阐明TNIK影响ERK5信号传递的机制,包括MEK5依赖性和激酶活性.
主要方法:
- 哺乳动物单杂交试验,以评估转录活性.
- 定量RT-PCR (qRT-PCR) 用于测量基因表达 (KLF2,KLF4,eNOS).
- 使用构成活性 (CA-MEK5α) 和主导-负 (DN-MEK5) MEK5构造,以及缺乏酸化的TNIK突变物的实验.
主要成果:
- TNIK knockdown降低了ERK5的转录活性,并降低了KLF2,KLF4和eNOS的表达.
- TNIK过度表达增强了ERK5的转录活性.
- CA-MEK5α 挽救了 TNIK 枯竭细胞中的 ERK5 活性,但 DN-MEK5 抑制了 TNIK 的作用,表明了 MEK5 的依赖性.
- 缺乏酸化的TNIK突变物保留了活性,这表明它在酶上扮演独立的角色.
- 在TNIK中,Knockdown增加了NFκB活性和EC亡.
结论:
- TNIK是一种ERK5信号传递的新型调节剂,通过MEK5依赖和独立的机制影响血管平衡.
- TNIK的作用延伸到内皮细胞中调节炎症和生存途径.
- TNIK代表了血管炎症和内皮功能障碍的潜在治疗点.
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
MAPK Signaling Cascades
6.1K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
6.1K
PI3K/mTOR/AKT Signaling Pathway
4.0K
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...
4.0K
NF-κB-dependent Signaling Pathway
7.9K
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...
7.9K
Master Transcription Regulators
7.1K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
7.1K
Receptor Tyrosine Kinases
14.3K
Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
14.3K


