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Production of Formed Elements01:34

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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
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Differentiation of Common Myeloid Progenitor Cells01:15

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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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体表达识别了古典NK细胞的早期骨髓前体.

Zhitao Liang1,2, Hope D Anderson3, Veronica Locher1

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概括

研究人员确定了EomeshiNKneg细胞作为自然杀手 (NK) 细胞的骨髓前体. 这些发现表明,NK细胞和1型先天性淋巴细胞 (ILC1s) 在发育早期分离.

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科学领域:

  • 免疫学 免疫学 免疫学
  • 细胞生物学 细胞生物学
  • 发展生物学 发展生物学

背景情况:

  • 自然杀手 (NK) 细胞是细胞毒性淋巴细胞,对免疫对病原体和瘤至关重要.
  • 1型先天性淋巴细胞 (ILC1s) 与NK细胞共享细胞因子的生产,但存在于组织中,缺乏细胞毒性.
  • NK细胞和ILC1s之间的发育关系尚不清楚,其中可能包括不同的血统或共享的前体.

研究的目的:

  • 研究NK细胞和ILC1s的发育起源.
  • 识别产生NK细胞和ILC1s的前体种群.
  • 为了确定NK细胞和ILC1s是否来自共同的祖先或单独的血统.

主要方法:

  • 单细胞RNA测序被用来分析细胞群.
  • 流细胞测量用于表征细胞表面标记物和转录因子表达.
  • 在体内进行细胞转移实验时,使用Rag2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 的受体小鼠.

主要成果:

  • 鉴定出了一种独特的骨髓谱系阴性,NK受体阴性细胞,表达高水平的转录因子Eomes (EomeshiNKneg).
  • 将EomeshiNKneg细胞转移到免疫缺陷受体中,产生了表现出抗转移活性的功能NK细胞.
  • 转移PLZF+的ILC前体产生了缺乏细胞毒性功能的ILC子集 (ILC1s,ILC2s,ILC3s) 的混合物.

结论:

  • 体NK细胞代表了古典NK细胞的特定骨髓前体.
  • 这项研究提供了证据,表明NK细胞和ILC1系在发育早期有分歧.
  • 这项研究澄清了先天性淋巴细胞和NK细胞的发育轨迹.