概括
神经生长因子 (NGF) 和其他信号分子,如表皮生长因子 (EGF) 和胰岛素,刺激PC12细胞中的蛋白质酸化. NGF,霍乱毒素 (CT) 和cAMP共享共同的蛋白质标,这表明它们有共同的信号通路.
科学领域:
- 细胞信号传输和分子生物学
- 神经科学和细胞生理学
- 蛋白质的生物化学 蛋白质的生物化学
背景情况:
- PC12神经样细胞是研究神经元分化和信号传递的一个模型系统.
- 蛋白质酸化是细胞过程中的关键调节机制,包括生长和分化.
- 众所周知,生长因子和NGF,EGF,胰岛素,CT和cAMP等信号分子通过蛋白质酸化来调节细胞功能.
研究的目的:
- 研究NGF,EGF,胰岛素,CT和cAMP对PC12细胞中蛋白质酸化的独特和重叠的影响.
- 阐明参与调解这些酸化事件的信号通路.
- 确定蛋白质酸化在NGF诱导的细胞反应中的作用.
主要方法:
- 用不同度的NGF,EGF,胰岛素,CT和cAMP对PC12细胞进行治疗.
- 分析蛋白质酸化模式,使用诸如西式涂抹或蛋白质组学等技术.
- 剂量反应和时间过程研究,以表征不同配体的作用.
- 通过结合连接体来研究不同信号通路之间的相互作用.
主要成果:
- NGF,CT和cAMP可酸化一组常见的蛋白质,包括氨酸氧化酶,核糖体蛋白S6,基因组H1和H3和HMG17,同时减少H2A酸化.
- EGF和胰岛素对蛋白质酸化有不同的影响,EGF增强了氨酸氧化酶酸化,胰岛素增强了基因素H3酸化.
- 通过NGF和cAMP介导的S6酸化似乎汇聚在一个共同的途径上,与EGF和胰岛素介导的途径不同. NGF的作用涉及cAMP依赖的蛋白激酶.
- 连接物度影响酸化程度,在生理度下观察到半最大效应.
结论:
- NGF,EGF,胰岛素,CT和cAMP在PC12细胞中不同调节蛋白质酸化,表明不同的信号机制.
- 由NGF诱导的蛋白质酸化,特别是通过cAMP依赖的途径,在NGF的生物作用中起着至关重要的作用.
- 该研究强调了不同生长因子和信号通路在调节细胞反应中的复杂交叉对话.
相关概念视频
Enzyme-linked Receptors
64.7K
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
64.7K
Phosphorylation
44.8K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
44.8K
Protein Kinases and Phosphatases
12.2K
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
12.2K
mTOR Signaling and Cancer Progression
3.6K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.6K
Amplifying Signals via Enzymatic Cascade
15.3K
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...
15.3K
PI3K/mTOR/AKT Signaling Pathway
5.2K
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...
5.2K


