相关实验视频
Updated: Sep 13, 2025

10:23
Evaluation of Caspase Activation to Assess Innate Immune Cell Death
Published on: January 20, 2023
3.4K
HMGB1激活caspase-1并通过GABPA-ASC诱导肝星细胞激活
Mengjia Jing1, Yixing Luo2, Lumiao Zhang1
1Department of Gastroenterology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Biochimica et biophysica acta. Molecular cell research
|August 1, 2025
概括
高流动性组盒1 (HMGB1) 通过激活肝星细胞 (HSCs) 来驱动肝纤维化. 抑制HMGB1或caspase-1激活显著逆转肝纤维化进展,突出了一个关键的治疗标.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 细胞生物学 细胞生物学
- 分子医学是分子医学.
背景情况:
- 肝纤维化涉及肝星细胞 (HSC) 的激活,通常与炎症有关.
- 高流动性组盒1 (HMGB1) 作为细胞外危险信号,影响HSC激活和caspase-1.
- 提奥乙胺 (TAA) 给药是一种常见的诱导肝纤维化模型的方法.
研究的目的:
- 研究HMGB1在TAA诱导的肝纤维化中的作用.
- 阐明HMGB1激活HSC并促进纤维化的机制.
- 评估向HMGB1或caspase-1在肝纤维化中的治疗潜力.
主要方法:
- 在动物中建立TAA诱导的肝纤维化模型.
- 乙基酸盐 (EP) 或AAV-shHMGB1的使用可抑制HMGB1.1.
- 在实验室中使用重组HMGB1 (rHMGB1) 和caspase-1抑制剂 (Z-YVAD-FMK) 进行HSC的研究.
- 分子技术包括免疫光,免疫阻塞,lentiviral传染, luciferase 记者测定和染色体免疫沉测定.
主要成果:
- 服用TAA导致HMGB1表达和血清水平增加,与纤维化进展相关.
- EP或AAV-shHMGB1治疗显著改善了TAA诱导的肝纤维化.
- 在HSC中,HMGB1激活了caspase-1,而caspase-1抑制则阻止了HMGB1诱导的HSC激活.
- HMGB1通过GABPA调节的ASC转录激活caspase-1,促进HSC激活和肝纤维化.
结论:
- HMGB1是肝纤维化发展的关键媒介.
- HMGB1通过GABPA向上调节ASC转录,促进HSC激活和肝纤维化,从而导致caspase-1激活.
- 准HMGB1或caspase-1为肝纤维化提供了一个有希望的治疗策略.
相关概念视频
Caspases
12.7K
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
12.7K
GPCRs Regulate Adenylyl Cylase Activity
5.9K
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
5.9K
Activation and Inactivation of G Proteins
7.6K
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
7.6K
cAMP-dependent Protein Kinase Pathways
6.6K
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,...
6.6K
GPCR Desensitization
6.5K
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
6.5K
Liver Regeneration
3.4K
The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are...
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are...
3.4K

