インスリン抵抗性と内皮機能障害の相互関係:分子および病理生理学的メカニズム
Jeong-a Kim1, Monica Montagnani, Kwang Kon Koh
1Diabetes Unit, National Center for Complementary and Alternative Medicine, National Institutes of Health, Bethesda, MD 20892-1632, USA.
Circulation
|April 19, 2006
まとめ
内皮機能障害とインスリン抵抗性は密接に関連しており,心血管疾患と代謝疾患を悪化させます. 一つの状態を改善すると,もう一方の状態が改善され,治療の可能性が強調されます.
科学分野:
- 心血管生物学 心血管生物学
- メタボリック生理学
- 血管生物学 血管生物学
背景:
- 内皮機能不全は,高血圧や動脈硬化などの心血管疾患の重要な特徴です.
- 2型糖尿病や肥満に共通するインスリン抵抗性も,内皮機能不全と関連している.
- 窒素酸化物 (NO) の放出と血管拡張を促進するインスリンによる血管作用は,グルコースの吸収に極めて重要です.
研究 の 目的:
- 内皮機能障害とインスリン抵抗性の相互関係を調査する.
- これらの状態を結びつける病理生理学的メカニズムについて議論する.
- 心血管疾患と代謝疾患の治療効果を強調する.
主な方法:
- 細胞,生理学,臨床,疫学研究のレビュー.
- 内皮および骨格筋におけるインスリンシグナル伝達経路の分析.
- 炎症過程を含むメカニズムの検討.
主要な成果:
- 内皮のインスリン信号伝達経路は,酸化窒素 (NO) とエンドセリン-1の産生を調節する.
- 代謝性インスリン抵抗性におけるインスリンシグナル伝達障害は,このバランスを崩し,血流を低下させ,インスリン抵抗性を悪化させる可能性があります.
- 研究によると,内皮機能の改善はインスリン抵抗性を改善し,その逆もそうです.
結論:
- 内皮機能不全とインスリン抵抗性との間に強い相互関係があり,心血管疾患と代謝疾患を結びつけています.
- 炎症プロセスは,これらの状態を結びつける役割を果たします.
- 内皮機能やインスリン感受性を標的とする治療戦略は,関連疾患の治療に有望である.
さらに関連する動画
関連する概念動画
Gastritis-II: Pathophysiology
Gastritis is marked by disruption of the mucosal barrier that usually protects the stomach tissue from digestive juices and manifests in acute and chronic forms.
In acute gastritis, the gastric mucosa becomes swollen and red and undergoes superficial erosion. Superficial ulceration may lead to bleeding.
In chronic gastritis, persistent or repeated insults lead to chronic inflammatory changes and, eventually, thinning or atrophy of the gastric tissue.
Gastritis can stem from various causes, each...
In acute gastritis, the gastric mucosa becomes swollen and red and undergoes superficial erosion. Superficial ulceration may lead to bleeding.
In chronic gastritis, persistent or repeated insults lead to chronic inflammatory changes and, eventually, thinning or atrophy of the gastric tissue.
Gastritis can stem from various causes, each...
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are co-secreted in...
Insulin and C-peptide are co-secreted in...
Insulin: The Receptor and Signaling Pathways
Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...
Type I Diabetes I: Introduction
Type 1 diabetes mellitus is a chronic metabolic disorder characterized by an absolute deficiency of insulin resulting from the autoimmune destruction of pancreatic β-cells. Although it can occur at any age, it is most commonly diagnosed in childhood, adolescence, or early adulthood. The loss of insulin production impairs cellular glucose uptake, resulting in persistent hyperglycemia and necessitating lifelong insulin therapy.Autoimmune Destruction of β-CellsThe hallmark of type 1 diabetes is an...
Type I Diabetes II: Pathophysiology
Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
Type II Diabetes II: Pathophysiology
PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.


