一个Lgr5独立的发育系涉及到小鼠肠道再生
Maryam Marefati1, Valeria Fernandez-Vallone1, Morgane Leprovots1
1Institute of Interdisciplinary Research in Molecular Human Biology (IRIBHM), Université Libre de Bruxelles (ULB), 1070 Brussels, Belgium.
概括
研究人员在成年小鼠中发现了一种新型的肠细胞,形成囊性球形. 这些细胞与干细胞不同,有助于上皮再生,类似于胎儿细胞,为肠道发育和修复提供了新的见解.
科学领域:
- 胃肠病学 胃肠病学
- 发育生物学 发展生物学
- 干细胞研究 干细胞研究
背景情况:
- 从成年老鼠肠道中提取的古典有机体培养通常依赖于特定的生长因子,如EGF, noggin 和 R-spondin.
- 这些有机物主要来自Lgr5阳性密码基柱状 (CBC) 干细胞,这些干细胞对肠道平衡至关重要.
研究的目的:
- 从成年小鼠肠道组织中生成的新型球形结构的特征.
- 研究这些球形生成细胞的发育起源和功能性质.
- 将这些球状体与经典的有机体进行比较,并了解它们独特的转录组形状.
主要方法:
- 成年小鼠肠道组织的酶性消化 (原酶和消化).
- 在Matrigel中培养生成的细胞.
- 转录基因分析 (RNA测序).
- 谱系追踪,细胞分类和单细胞RNA测序.
主要成果:
- 成年小鼠的肠道组织产生了分化有机体和稳定可再生的囊性球体.
- 这些球状体表现出肠道分化不良,并且独立于R-spondin, noggin 和 EGF 生长.
- 它们的转录组反映了胎儿的肠球体,显示了CBC标记物的下调 (Lgr5,Ascl2,Smoc2,Olfm4) 和炎症,介质和YAP基因的上调.
- 成人球形生成细胞代表了一种新的血统,与Lgr5+CBC分开,并在CBC切除后促进上皮再生.
结论:
- 一个以前未被描述的成年肠道细胞系,独立于Lgr5+CBCs,产生囊性球体.
- 这些球状体具有独特的转录组特征和发展潜力,与经典的有机体有所区别.
- 这种新型血统在肠道上皮再生中发挥作用,特别是在CBCs受损或被切除后.
相关概念视频
Renewal of Intestinal Stem Cells
2.5K
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...
2.5K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.0K
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...
2.0K


