相关实验视频
Updated: Jul 15, 2025

13:07
One-channel Cell-attached Patch-clamp Recording
Published on: June 9, 2014
24.4K
Piezo1激活了非正规的EGFR内细胞和信号传导
Carlos Pardo-Pastor1, Jody Rosenblatt1,2
1Randall Centre for Cell & Molecular Biophysics, New Hunt's House, School of Basic & Medical Sciences, Faculty of Life Sciences & Medicine, King's College London, SE1 1UL London, UK.
Science advances
|September 27, 2023
概括
机械力通过Piezo1通道激活细胞生长途径,与EGF信号不同. 这种由Piezo1介导的途径涉及Src和p38激酶,驱动细胞循环的重新进入,并可能为再生和癌症提供新的治疗点.
科学领域:
- 细胞生物学 细胞生物学
- 机械生物学 机械生物学
- 分子信号传输的方法
背景情况:
- 皮表皮生长因子受体 (EGFR) - 细胞外信号 - 调节激酶 (ERK) 信号传递对于细胞周期控制在发育,平衡和疾病中至关重要.
- 机械力量,以及表皮生长因子 (EGF) 连接物,可以激活EGFR-ERK信号,但中间分子是未知的.
研究的目的:
- 为了确定机械力和EGFR-ERK激活之间的分子联系.
- 阐明通过机械刺激 (通过Piezo1) 与EGF连接体激活EGFR的独特机制.
- 调查Piezo1介导的EGFR-ERK信号在肺组织中的下游后果.
主要方法:
- 研究了延伸激活离子通道Piezo1在介导机械信号到EGFR-ERK通路中的作用.
- 通过EGF触发的EGFR内细胞和ERK激活与Piezo1激活进行了比较.
- 使用ex vivo肺切片来评估Piezo1激活对细胞周期进展,核ERK,AP-1和YAP积累的影响.
主要成果:
- 皮埃佐1通道是机械力和EGFR-ERK激活之间的缺失环节.
- 依赖于Piezo1的EGFR激活涉及Src-p38激酶依赖的血清酸化,与EGF的正规氨酸自酸化形成鲜明对比.
- 肺部切片中的Piezo1激活促进了细胞周期的重新进入,核ERK,AP-1和YAP的积累,模仿再生和恶性信号.
结论:
- 通过Piezo1,Src和p38激酶传递机械信号在细胞循环控制中起着重要作用,在修复,再生和癌症方面可能比标准EGF信号更重要.
- 这些发现表明,Piezo1介导的信号传递是涉及异常细胞增殖的疾病的潜在治疗标.
相关概念视频
Amplifying Signals via Enzymatic Cascade
8.5K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
8.5K
IP3/DAG Signaling Pathway
12.2K
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
12.2K
PI3K/mTOR/AKT Signaling Pathway
3.6K
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...
3.6K
MAPK Signaling Cascades
5.6K
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...
5.6K
The JAK-STAT Signaling Pathway
9.0K
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...
9.0K
Interactions Between Signaling Pathways
6.3K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.3K

