集成素α7β1抑制了肠道吸收细胞分化的发生
Gabriel Cloutier1, Amira Seltana1, Sepideh Fallah1
1Laboratory of Intestinal Physiopathology, Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada.
Experimental cell research
|July 27, 2023
概括
集成蛋白α7β1通过抑制关键因素和表观遗传修饰来抑制肠道细胞分化. 它的去除促进了细胞成熟,揭示了它在调节吸收细胞终端分化的作用.
科学领域:
- 细胞生物学 细胞生物学
- 胃肠病学 胃肠病学
- 分子生物学分子生物学
背景情况:
- 肠上皮细胞分化是一个复杂的过程,对肠道功能至关重要.
- 过境放大 (TA) 区域是通过未知的调节机制暂时停止分化的地方.
- 表皮细胞 - 基质相互作用,特别是拉米因,与调节分化有关.
研究的目的:
- 研究整合素α7β1在调节肠道吸收细胞分化中的作用.
- 阐明整合素α7β1影响Caco-2/15细胞分化的分子机制.
主要方法:
- 在Caco-2/15细胞中使用shRNA和CRISPR/Cas9对ITGA7基因进行 Knockdown.
- 对分化和两极化标记,细胞形态和信号通路 (FAK, Src) 的分析.
- 评估关键的转录因子 (CDX2,HNFα1,HNF4α) 和表观遗传修饰 (基因组甲基化和乙化).
主要成果:
- 整合素α7亚单元的切除显著增加了肠道细胞分化和极化标志物.
- 降低α7的焦点粘附激酶和Src激酶活性.
- 在α7-敲击细胞中观察到CDX2,HNFα1和HNF4α的过度表达,以及改变的基因组修饰.
- 细胞增殖没有受到α7剥离的影响.
结论:
- 在Caco-2/15细胞模型中,整合素α7β1作为吸收细胞末端分化的显著抑制剂.
- 在TA区中的拉米宁-α7β1整合素相互作用可能有助于在成年肠道中暂时抑制分化.
相关概念视频
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.1K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.1K
Renewal of Intestinal Stem Cells
2.6K
The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
2.6K
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
2.2K
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
2.2K
Histology of the Small Intestine
1.0K
The small intestine exhibits a unique histological structure that significantly enhances its function in digestion and nutrient absorption. These structures include circular folds, villi, and various specialized cells that collectively facilitate the digestion of food.
The intestinal lining features transverse folds called circular folds, each housing fingerlike projections known as intestinal villi. These villi are covered by a layer of simple columnar epithelium, also referred to as...
The intestinal lining features transverse folds called circular folds, each housing fingerlike projections known as intestinal villi. These villi are covered by a layer of simple columnar epithelium, also referred to as...
1.0K
Glucose Absorption Into the Small Intestine
31.8K
Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and...
31.8K
Adult Stem Cells
30.3K
Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
30.3K


