对糖原合成酶激酶-3β在细胞存活和NF-kappaB激活中的要求
K P Hoeflich1, J Luo, E A Rubie
1Ontario Cancer Institute/Princess Margaret Hospital, Toronto, Canada.
Nature
|July 14, 2000
概括
糖原合成酶激酶-3β (GSK-3β) 缺乏导致由于过度瘤坏死因子 (TNF) 毒性导致肝损伤的胚胎死亡. GSK-3β促进核因子-kappaB (NF-kappaB) 功能,防止TNF诱导的细胞死亡.
科学领域:
- 分子生物学分子生物学
- 发展生物学 发展生物学
- 免疫学 免疫学 免疫学
背景情况:
- 糖原合成酶激酶-3 (GSK-3) 异型,α和β,是Wnt信号传递和细胞增殖的关键调节者.
- 之前对模型生物的研究为GSK-3的生理作用提供了洞察力.
研究的目的:
- 研究GSK-3β在哺乳动物胚胎发育中的功能.
- 阐明GSK-3β在调节瘤亡因子 (TNF) 和核因子-kappaB (NF-kappaB) 信号通路中的作用.
主要方法:
- 鼠类GSK-3β的基因破坏.
- 对胚胎死亡率和肝脏退化现象类型的分析.
- 使用抗TNF-α抗体抑制TNF.
- 评估纤维细胞对TNF-alpha的敏感性.
- 在GSK-3β缺乏细胞中评估NF-kappaB激活和功能.
- 用治疗以抑制GSK-3活动.
主要成果:
- 破坏GSK-3β导致胚胎致死性与严重的肝脏退化,模仿过度的TNF毒性.
- 缺乏GSK-3β胚胎的胚胎通过抗TNF-α抗体治疗得到拯救.
- 缺乏GSK-3β的纤维细胞对TNF-alpha过敏,NF-kappaB功能受损.
- 治疗抑制NF-kappaB的交换活化,并使野生类型细胞对TNF敏感.
- 在转录复合体水平上,GSK-3β调节NF-kappaB,而不是早期激活步骤.
结论:
- 通过减轻TNF毒性,GSK-3beta在预防胚胎致死性方面发挥着关键作用.
- GSK-3β对于适当的NF-kappaB功能至关重要,在I-kappaB降解和NF-kappaB核转移的下游起作用.
- GSK-3β促进NF-kappaB介导的转录调节,突出其在发育过程和细胞保护中的重要性.
更多相关视频
相关概念视频
GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
NF-κB-dependent Signaling Pathway
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 heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
TGF - β Signaling Pathway
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 are of three kinds RI, RII, and RIII. The RI...
NF-kB-dependent Signaling Pathway
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 heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...


