関連する実験動画
Updated: May 25, 2026

07:22
Isolation and Differentiation of Stromal Vascular Cells to Beige/Brite Cells
Published on: March 28, 2013
線維細胞成長因子-21は,PPARγの活性とチアゾリジンダイオンの抗糖尿病作用を調節する
Paul A Dutchak1, Takeshi Katafuchi, Angie L Bookout
1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9041, USA.
Cell
|February 7, 2012
まとめ
フィブロブラスト成長因子-21 (FGF21) は,脂肪組織に作用し,脂肪細胞生成の主調節体であるペロキシソーム増殖器活性化受容体ガンマ (PPARγ) を制御する. FGF21は,PPARγの活性とその代謝効果に不可欠です.
科学分野:
- メタボリック研究.
- エンドクリノロジー エンドクリノロジー
- 分子生物学は分子生物学である.
背景:
- フィブロブラスト成長因子-21 (FGF21) は,炭水化物および脂質代謝に影響を与える循環ホルモンとして知られています.
- ペロキシソーム増殖器活性化受容体ガンマ (PPARγ) は,アディポゲネシスとメタボリックホメオスタシスを調節する重要な転写因子です.
研究 の 目的:
- 脂肪組織におけるオトクリン因子としてのFGF21の役割を調査する.
- FGF21とPPARγシグナル伝達の間の規制関係を解明する.
主な方法:
- FGF21ノックアウト (KO) マウスモデルを使用した.
- 評価されたPPARγシグナル伝達活動,遺伝子発現,およびスモイレーション.
- 野生型およびFGF21-KOマウスにおけるPPARγアゴニストロシグリタゾンに対する検査反応.
主要な成果:
- FGF21-KOマウスは,PPARγシグナル伝達が低下し,体脂肪が減少し,遺伝子発現が弱まった.
- FGF21-KOマウスは,ロシグリタゾンの代謝効果 (有益と有害の両方) に反応しなかった.
- FGF21の喪失は,PPARγのスモイル化を増加させ,その転写活性を低下させた.
- FGF21の再導入により,PPARγのスモイル化が逆転し,その活性が回復した.
結論:
- FGF21は,脂肪組織における誘導可能な,栄養状態のオトクリン因子として機能する.
- FGF21は,PPARγ活動を調節するフィードフォワードループで重要な役割を果たしています.
- FGF21は,PPARγの生理学的および薬理学的作用の両方を媒介するために不可欠です.
関連する概念動画
Oral Hypoglycemic Agents: Biguanides and Glitazones
Biguanides, particularly metformin (Glucophage), are insulin sensitizers that enhance glucose uptake, thereby reducing insulin resistance. Unlike sulfonylureas, metformin doesn't prompt insulin secretion, which helps to curb hypoglycemia risk. Metformin is beneficial in treating conditions like polycystic ovary syndrome due to its insulin-resistance reduction capability. The drug's primary action involves curtailing hepatic gluconeogenesis, a significant contributor to high blood glucose levels...
Dipeptidyl Peptidase 4 Inhibitors
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 significant...
Glucagon-like Receptor Agonists
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 the...
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 the...
Cell Specific Gene Expression
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...
Hormones Regulating Blood Glucose
Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...
In addition to accelerating glucose uptake and utilization, insulin has...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
