相关实验视频
Updated: Jul 3, 2025

08:58
Optimized Analysis of In Vivo and In Vitro Hepatic Steatosis
Published on: March 11, 2017
16.0K
通过UDPG阻断S1P来对抗肝糖生成
Jie Chen1, Yabo Zhou1, Zhuohang Liu1
1Department of Immunology and National Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China.
概括
这项研究揭示了尿素二酸葡萄糖 (UDPG) 如何防止肝细胞脂肪积累,而是促进糖原的储存. 在小鼠模型中,UDPG有效治疗非酒精性脂肪性肝病 (NAFLD).
科学领域:
- 肝病学
- 代谢疾病研究
- 分子生物学
背景情况:
- 非酒精性脂肪肝 (NAFLD) 是与肝细胞脂肪代谢失调相关的日益严重的健康问题.
- 目前用于预防和治疗NAFLD的策略需要更深入地了解细胞葡萄糖代谢.
- 识别有利于糖原合成而不是脂肪储存的机制对于代谢健康至关重要.
研究的目的:
- 阐明肝细胞优先储存葡萄糖而不是脂肪的分子机制.
- 调查尿素二糖 (UDPG) 在调节脂质生成和糖质生成中的作用.
- 评估UDPG在改善NAFLD的治疗潜力.
主要方法:
- 研究了UDPG与小鼠和人类肝细胞脂质生成的关键调节剂之间的相互作用.
- 使用细胞培养模型和NAFLD小鼠模型.
- 用于评估其对肝脏脂肪积累和糖原合成的影响.
- 研究了UDPG运输到戈尔吉装置及其对固醇调节元素结合蛋白 (SREBPs) 的影响.
主要成果:
- 证明糖分生成中间体尿素二糖 (UDPG) 能够积极对抗脂质生成.
- 表明UDPG抑制了Golgi器官中Site-1蛋白酶 (S1P) 的调元素结合蛋白 (SREBPs) 的分裂.
- 在小鼠模型和人体器官中证实UDPG有效减少脂肪积累和治疗NAFLD.
结论:
- 通过抑制脂质生成,UDPG在引导葡萄糖代谢向葡萄糖储存方面发挥着至关重要的作用.
- 该机制涉及UDPG与戈尔吉装置中的S1P相互作用,防止SREBP激活.
- UDPG是治疗NAFLD和其他以肝脏脂肪积累为特征的代谢疾病的有希望的治疗点.
相关概念视频
Dipeptidyl Peptidase 4 Inhibitors
187
Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
187
Glucagon-like Receptor Agonists
322
Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by...
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by...
322
GPCRs Regulate Adenylyl Cylase Activity
5.6K
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...
5.6K
Cell Specific Gene Expression
13.6K
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...
13.6K
cAMP-dependent Protein Kinase Pathways
6.4K
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,...
6.4K
Oral Hypoglycemic Agents: α-Glucosidase Inhibitors
175
α-glucosidase inhibitors, including acarbose (Precose), miglitol (Glyset), and voglibose (Voglib) (primarily available in Asia), are drugs that control blood sugar levels by delaying the digestion of starch and disaccharides. They achieve this by inhibiting α-glucosidase enzymes in the intestine, which slow the absorption of carbohydrates in the intestine, which in turn leads to a prolonged release of the glucoregulatory hormone GLP-1 from intestinal L-cells.
Acarbose and miglitol are...
Acarbose and miglitol are...
175

