関連する実験動画
Updated: Jul 3, 2025

08:58
Optimized Analysis of In Vivo and In Vitro Hepatic Steatosis
Published on: March 11, 2017
16.0K
UDPG経由でS1Pを阻害することで,肝臓の糖分生成が逆行する
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.
まとめ
この研究では,尿素二酸化グルコース (UDPG) が肝細胞の脂肪の蓄積を防止し,代わりにグリコゲンの貯蔵を促進する方法を明らかにしました. UDPGの投与は,マウスモデルで非アルコール性脂肪肝 (NAFLD) を効果的に治療しました.
科学分野:
- ヘパトロジー
- 代謝疾患の研究
- 分子生物学
背景:
- 非アルコール性脂肪肝 (NAFLD) は,肝細胞における脂肪代謝の乱れに関連した健康上の懸念が高まっている.
- NAFLDの予防と治療の現在の戦略は,細胞のグルコース代謝のより深い理解を必要とします.
- 脂肪の貯蔵よりもグリコゲンの合成を好むメカニズムを特定することは,代謝の健康にとって極めて重要です.
研究 の 目的:
- 肝細胞が脂肪ではなく,グルコースを優先的に貯蔵する分子メカニズムを解明する.
- 尿素二酸化グルコース (UDPG) がリポゲネシスとグリコゲネシスを調節する役割を調査する.
- NAFLDの改善におけるUDPGの治療の可能性を評価する.
主な方法:
- マウスとヒトの肝細胞におけるUDPGと重要なレギュレータの相互作用を調査した.
- 細胞培養モデルとNAFLDのマウスモデルを使用した.
- 肝臓脂肪の蓄積とグリコゲンの合成への影響を評価するためにUDPGを投与した.
- ゴルギ装置へのUDPG輸送と,ステロール調節要素結合タンパク質 (SREBPs) に対するその影響を調べた.
主要な成果:
- グリコゲネシスの中間体であるウリジン二酸化グルコース (UDPG) がリポゲネシスを積極的に阻害することを実証した.
- UDPGは,ゴルジ装置におけるサイト-1プロテアゼ (S1P) によってステロール調節要素結合タンパク質 (SREBPs) の分裂を阻害することが示された.
- UDPGの投与は脂肪の蓄積を効果的に減らし,マウスモデルとヒトオーガノイドでNAFLDを治療することを確認しました.
結論:
- UDPGは,脂質生成を阻害することによって,グルコース代謝をグリコゲン貯蔵に導く上で重要な役割を果たします.
- このメカニズムは,UDPGとS1Pの相互作用により,SREBPの活性化が防止されます.
- UDPGはNAFLDおよび肝臓脂肪の蓄積によって特徴づけられる他の代謝障害の管理のための有望な治療目標です.
関連する概念動画
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

