ISL1は親子プログラムを制限し,β細胞の成熟を促進し,糖尿病の進行における性差異を明らかにする
Valeria Fabriciova1,2, Romana Bohuslavova1, Laura Lebron-Mora1,2
1Laboratory of Molecular Pathogenetics, Institute of Biotechnology, Czech Academy of Sciences (CAS), Prague, Czechia.
Diabetes
|February 17, 2026
まとめ
転写因子ISL1は,臓内分泌細胞の成熟と機能に不可欠です. ISL1の喪失により,未成熟のベータ細胞とアルファ細胞の障害が生じ,糖尿病の発症に寄与する.
科学分野:
- エンドクリノロジー エンドクリノロジー
- 発達生物学 発達生物学とは
- 分子遺伝学 分子遺伝学
背景:
- 臓の小島細胞は,調節された転写および表遺伝的プロセスを通して,祖先のプールから発達します.
- 転写因子ISL1 (ISL LIMホメオドメイン) は小島発育に不可欠ですが,その正確な分子機能は不明です.
- ISL1は糖尿病の感受性に関与しているが,臓内分泌の成熟におけるその役割はまだ解明されていない.
研究 の 目的:
- 臓内分泌細胞の同一性と末端の分化を維持するISL1の分子機能を明らかにする.
- 臓内分泌前駆体におけるISL1喪失の転写的および表遺伝的影響を調査する.
- ISL1不調が糖尿病の病原化にどのように寄与するかを理解する.
主な方法:
- マウスの内分泌前駆体におけるIsl1の条件付消去.
- 転写プロファイリングのための単細胞RNA配列決定 (scRNA-seq).
- 染色体プロフィール (H3K27acとH3K27me3) を用いて,表遺伝的景観を評価する.
- Isl1欠乏した小島群の縦断単細胞分析.
主要な成果:
- ISL1の喪失は,小島の表遺伝子および転写的景観を混乱させる.
- ISL1欠乏は,アルファ細胞の同一性の障害,デルタ細胞とガンマ細胞の喪失,機能障害のある未成熟のベータ細胞を引き起こす.
- Isl1欠乏細胞は,長期間続く祖先のような状態,ベータ細胞の欠陥成熟,およびストレス/糖尿病に関連する経路の活性化を示します.
- ISL1欠乏したマウスでは,性別の明確な反応が観察されました.
結論:
- ISL1は,内分泌細胞の運命を保ち,系統のコミットメントを促進し,末端の差別化を可能にするために不可欠です.
- ISL1は転写抑制剤として作用し,成熟した内分泌細胞機能のためのクロマチンの改造を促進します.
- ISL1の失調は,島根細胞の成熟と機能を妨害することによって糖尿病に寄与し,病気の進行に性別の影響を及ぼす可能性があります.
関連する概念動画
Diabetes Mellitus: Overview and Type I Subtype
5.6K
Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
5.6K
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
2.7K
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...
Insulin and C-peptide are...
2.7K
Forced Transdifferentiation
2.4K
Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
Artificial...
Artificial...
2.4K
Insulin Secretory Vesicles
7.0K
Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
7.0K
Insulin: Biosynthesis, Chemistry, and Preparation
1.5K
The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment...
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment...
1.5K
Cell Specific Gene Expression
16.7K
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...
16.7K


