相关实验视频
Updated: Jan 15, 2026

12:36
Murine Precision-Cut Liver Slices as an Ex Vivo Model of Liver Biology
Published on: March 14, 2020
17.5K
肝蛋白激酶Cβ对抗p38MAPK以激活ERK1/2以在石化压力时失调胆汁脂质组成
Yaoling Shu1, Amit Rai1, Gina M Sizemore2
1Department of Biological Chemistry and Pharmacology, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States.
概括
这项研究揭示了肝脏蛋白激酶Cbeta (PKCβ) 如何调节肝脏基因表达和信号通路,影响胆汁酸代谢和胆固醇平衡在石化饮食下. 了解这个PKCβ/p38MAPK/ERK1/2轴为胆结石疾病提供了新的治疗点.
科学领域:
- 肝病学和代谢信号通路.
- 胆固醇和胆汁酸代谢的分子机制.
- 信号转导在肝脏疾病的发病过程中.
背景情况:
- 石化饮食破坏胆汁脂质平衡,导致胆固醇沉和胆结石形成.
- 调解这些干扰的精确信号通路仍然不完全理解.
- 蛋白激酶Cbeta (PKCβ) 在肝脏胆固醇和胆酸调节中发挥作用.
研究的目的:
- 为了阐明启动信号事件和肝脏在肝脏PKCβ功能的损失后肝脏的生物变化在石化压力下.
- 确定参与PKCβ介导肝脂代谢调节的关键分子参与者和途径.
主要方法:
- 从暴露于光生饮食的PKCβ缺乏小鼠肝脏组织的转录组分析.
- 涉及Westernblotting的机制研究,以评估蛋白质酸化 (ERK1/2,p38).
- 基因操纵 (过度表达和耗尽) 来调查PKCβ,p38MAPK和ERK1/2在调节基因表达中的作用 (例如,Cyp7a1,Cyp8b1).
主要成果:
- 肝脏中PKCβ的缺失显著改变了183个肝脏基因的表达,特别是增加了胆酸生物合成基因 (Cyp7a1,Cyp8b1) 和减少了视网醇代谢基因.
- PKCβ缺乏与ERK1/2酸化降低和p38酸化增加有关.
- 通过对抗p38MAPK信号传递,PKCβ作为ERK1/2的积极调节者,抑制Cyp7a1和Cyp8b1.
结论:
- 肝PKCβ对于在石化条件下维持胆汁脂质组成至关重要.
- PKCβ/p38MAPK/ERK1/2信号轴集成细胞信号以平衡肝脂代谢.
- 准这种信号通路为胆病 (胆病) 提供了潜在的治疗策略.
相关概念视频
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
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
Interactions Between Signaling Pathways
7.2K
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...
7.2K
The Unfolded Protein Response
6.2K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
6.2K
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

