関連する実験動画
Updated: Jul 20, 2026

11:10
Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice
Published on: November 16, 2011
AKT2の変異による重度のインスリン抵抗性と糖尿病の家族
Stella George1, Justin J Rochford, Christian Wolfrum
1Department of Clinical Biochemistry, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 2QQ, UK.
まとめ
AKT2遺伝子の突然変異は,重度のインスリン抵抗性や糖尿病を引き起こす. この研究は,ヒトのインスリン感受性におけるAKTシグナル伝達の重要な役割を強調し,2型糖尿病の発症に影響を与えています.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- エンドクリノロジー エンドクリノロジー
背景:
- インスリン抵抗性は,2型糖尿病の重要な要因である.
- インスリン受容体の下流にあるシグナル伝達経路は,糖尿病の病原性に関与しています.
- タンパク質キナーゼAKT2 (PKBbetaとも呼ばれる) はインスリンシグナル伝達に作用する.
研究 の 目的:
- 2型糖尿病におけるインスリン受容体のシグナル伝達経路における遺伝的欠陥の役割を調査する.
- 深刻なインスリン抵抗性と糖尿病に寄与する特定の遺伝子変異を特定する.
- 人間のインスリン感受性におけるAKT2/PKBbetaタンパク質キナーゼの機能を明らかにする.
主な方法:
- 重度のインスリン抵抗性および糖尿病の自己相性支配的な遺伝を持つ家族の遺伝的分析.
- 分子クローニングと,培養細胞における変異したAKT2/PKBβキナーゼの発現.
- インスリンシグナル伝達障害と野生型のAKT機能への影響の評価.
主要な成果:
- AKT2/PKBbeta遺伝子の変異は,自己相性支配的重症インスリン抵抗性および糖尿病の家族で特定されました.
- 培養細胞における突然変異したAKT2キナーゼの発現は,代謝標的へのインスリン信号伝達を阻害した.
- 変異したAKT2キナーゼは,共発現した野生型のAKTの機能を阻害し,支配的ネガティブな効果を示唆した.
結論:
- AKT信号伝達の遺伝的欠陥は,ヒトの2型糖尿病の重要な原因である.
- AKT2/PKBbetaの変異は,インスリンシグナル伝達の障害によって,重度のインスリン抵抗性および糖尿病を引き起こす可能性があります.
- AKTシグナル伝達は,ヒトにおけるインスリン感受性の維持に根本的に重要です.
関連する概念動画
PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
Diabetes Mellitus: Type 2 and Gestational
Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...
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 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 I: Introduction
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
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.

