相关实验视频
Updated: Jan 15, 2026

10:36
Measurements of Physiological Stress Responses in C. Elegans
Published on: May 21, 2020
14.9K
能量压力诱导的PKCζ S-Glutathionylation对于LKB1细胞质转位和AMPK激活至关重要
Junjie Fei1, Shuhan Yu1, Mingzhe Xu1
1Center of Growth, Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China.
Life metabolism
|October 10, 2025
概括
能量压力通过活性氧物种 (ROS) 激活AMP激活蛋白激酶 (AMPK),促进蛋白激酶C zeta (PKCζ) 核进口. 这促进了肝激酶B1 (LKB1) 的细胞质转移和AMPK激活.
科学领域:
- 细胞代谢的细胞代谢.
- 信号传导途径的信号传导途径.
- AMPK激活的分子机制
背景情况:
- 激活AMP激活蛋白激酶 (AMPK) 激活对于细胞能量恒温至关重要.
- 肝激酶B1 (LKB1) 是AMPK激活的关键上游激酶.
- 蛋白激酶C zeta (PKCζ) 的核转移与LKB1调节有关,但机制尚不清楚.
研究的目的:
- 阐明在能量压力期间PKCζ核转移的机制.
- 调查活性氧物种 (ROS) 在PKCζ核进口和随后AMPK激活中的作用.
- 建立信号轴,将能量压力,ROS,PKCζ和AMPK激活联系起来.
主要方法:
- 在体外和体内研究中,使用葡萄糖饥饿和甲福林治疗来诱导能量压力.
- 分析PKCζ在Cys48中的S-葡萄糖化及其与卡里奥费林亚单元α2 (KPNA2) 的相互作用.
- 对Ser428中的LKB1酸化及其细胞质转位的评估.
- 评估ROS降低对高脂肪饮食诱导的肝脂积累和甲福明疗效的影响.
主要成果:
- 能量压力提高细胞ROS,促进PKCζ核进口.
- ROS在Cys48处诱导PKCζ的S-氨基化,增强其与KPNA2进行核转位的相互作用.
- PKCζ核转位促进LKB1酸化和细胞质转位,导致AMPK激活.
- 降低ROS会损害甲福尔明的低血糖效应,并加剧饮食引起的肝肥胖症.
结论:
- 能量压力诱导的ROS触发了PKCζ通过S-甲和KPNA2相互作用的核转移.
- ROS-PKCζ-KPNA2-LKB1轴是AMPK激活的一个关键途径.
- 针对这一轴可能为代谢障碍提供治疗策略.
相关概念视频
cAMP-dependent Protein Kinase Pathways
8.3K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
8.3K
PI3K/mTOR/AKT Signaling Pathway
5.3K
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...
5.3K
MAPK Signaling Cascades
7.9K
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...
7.9K
Other Stress Responses in Bacteria
345
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
345
Regulation of the Unfolded Protein Response
2.9K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.9K
The JAK-STAT Signaling Pathway
12.0K
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...
12.0K

