MAPK向瓜核酸交换因子GEF-H1发出信号的动态合
1Department of Pharmacology, adMare BioInnovations, Montréal, Quebec, H4S 1Z9, Canada.
OncoTargets and therapy
|January 30, 2025
概括
在胰腺癌中,GEF-H1通过将PP2A与KSR-1进行支架来强化MAPK信号传递. 抑制GEF-H1可能为RAS驱动的癌症提供一种新的治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症信号传递 癌症信号传递
背景情况:
- 在KRAS基因 (>90%) 激活突变驱动胰腺管道腺癌 (PDAC).
- 突变KRAS激活MAPK通路,影响癌症表型,如增殖和生存.
- PDAC的生长和生存取决于GEF-H1,这是RhoA的关氨酸核酸交换因子.
研究的目的:
- 调查GEF-H1在增强MAPK信号传递中的意想不到的作用.
- 为了阐明涉及GEF-H1,MAPK和ARHGEF2表达的反循环.
- 建议GEF-H1作为RAS驱动癌症的潜在治疗标.
主要方法:
- 在PDAC中对GEF-H1功能的文献综述.
- 对GEF-H1,PP2A和KSR-1之间的相互作用进行分析.
- 通过MAPK信号来检查ARHGEF2表达的反调节.
主要成果:
- 独立于RhoGEF活动的GEF-H1,支架PP2A到KSR-1,增强MAPK信号传递.
- 积极的MAPK信号反通过转录因子增加ARHGEF2的表达.
- 在PDAC中的RREB1下调允许持续的GEF-H1表达和MAPK激活.
结论:
- 通过积极的反循环,GEF-H1在增强RAS-MAPK信号传输方面发挥着复杂的作用.
- 抑制GEF-H1代表了对KRAS突变的胰腺癌的有希望的治疗策略.
- 向GEF-H1可以克服当前针对MAPK的治疗方法的局限性.
更多相关视频
11:28Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein GST-RhoAG17A from Epithelial Cell Lysates
Published on: March 31, 2012
16.5K
09:32Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
Published on: June 15, 2017
8.7K
相关概念视频
MAPK Signaling Cascades
5.1K
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...
5.1K
Interactions Between Signaling Pathways
6.2K
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...
6.2K
Small GTPases - Ras and Rho
3.9K
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
3.9K
Amplifying Signals via Enzymatic Cascade
8.2K
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...
8.2K
Assembly of Signaling Complexes
5.7K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.7K
Intracellular Signaling Cascades
46.2K
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
46.2K
