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相关概念视频

Diabetes Mellitus: Overview and Type I Subtype01:22

Diabetes Mellitus: Overview and Type I Subtype

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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...
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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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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...
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Forced Transdifferentiation01:28

Forced Transdifferentiation

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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.
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Insulin Secretory Vesicles01:05

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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...
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Insulin: Biosynthesis, Chemistry, and Preparation01:25

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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.
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Cell Specific Gene Expression

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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...
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相关实验视频

Updated: Feb 19, 2026

Surgical Injury to the Mouse Pancreas through Ligation of the Pancreatic Duct as a Model for Endocrine and Exocrine Reprogramming and Proliferation
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ISL1限制了原始细胞程序并促进β细胞成熟,揭示了糖尿病进展中的性别差异.

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
PubMed
概括

转录因子ISL1对于胰腺内分泌细胞的成熟和功能至关重要. 失去了ISL1导致不成熟的β细胞和受损的α细胞,导致糖尿病的发展.

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科学领域:

  • 内分泌学 在内分泌学.
  • 发展生物学 发展生物学
  • 分子遗传学 分子遗传学

背景情况:

  • 胰腺小岛细胞通过受调节的转录和表观遗传过程从祖先池中发展.
  • 转录因子ISL1 (ISL LIM主体) 对于小岛的发育至关重要,但其精确的分子功能尚不清楚.
  • ISL1与糖尿病易感性有关,但其在胰腺内分泌成熟中的作用仍未解决.

研究的目的:

  • 阐明ISL1在维持胰腺内分泌细胞同一性和终端分化方面的分子功能.
  • 研究胰腺内分泌前体中ISL1损失的转录和表观遗传后果.
  • 了解ISL1失调是如何导致糖尿病病原的.

主要方法:

  • 在小鼠内分泌前体中条件删除Isl1.
  • 单细胞RNA测序 (scRNA-seq) 用于转录分析.
  • 染色体分析 (H3K27ac和H3K27me3) 用于评估表观遗传特征.
  • 长度单细胞分析ISl1缺乏的小岛屿.

主要成果:

  • 失去ISL1会破坏小岛的表观遗传和转录格局.
  • 缺少ISL1导致阿尔法细胞身份失败,三角形和马细胞丧失,以及功能受损的未成熟β细胞.
  • 缺少Isl1的细胞表现出持续的祖先状状态,缺陷的β细胞成熟,以及与压力/糖尿病相关的途径的激活.
  • 在ISL1缺乏的小鼠中观察到明显的性别特异性反应.

结论:

  • ISL1对于保存内分泌细胞命运,促进血统承诺,并使终端分化成为可能至关重要.
  • ISL1充当转录抑制剂,促进染色质重塑成熟内分泌细胞功能.
  • 通过破坏小岛细胞的成熟和功能,ISL1失调会导致糖尿病,对疾病进展有潜在的性别特异性影响.