双重机制的炎症感应由血液形成的祖先基因组
Vu L Tran1, Peng Liu2, Koichi R Katsumura1
1Wisconsin Blood Cancer Research Institute, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
Science advances
|May 28, 2025
概括
在GATA2-低原始体中,炎症激活PU.1转录因子来感知炎症信号. 这种涉及IKKβ和RUNX1的反应有助于调节基因组活动和炎症感应.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 免疫学 免疫学 免疫学
背景情况:
- 基因组动态地适应环境信号,如炎症.
- 原生细胞中的GATA2缺乏导致骨髓衰竭和白血病倾向.
- 低GATA2原始体对炎症媒介的敏感性增加.
研究的目的:
- 为了阐明原始细胞基因组如何感知和响应炎症,当GATA2是限制性的.
- 确定由低GATA2原始体适应炎症信号的机制.
主要方法:
- 研究了转录因子在低GATA2的小鼠原始体中的炎症反应中的作用.
- 使用干扰素-γ和Toll-Like受体激活剂作为炎症刺激.
- 分析了PU.1对染色质和基因激活模式的招募.
- 评估了IKKβ和RUNX1在炎症反应中的参与.
主要成果:
- 在暴露于干扰素-γ和TLR激动剂时,PU.1在低GATA2原始体中赋予了转录激活.
- 炎症通过调节PU.1结合和特定位置的活性来重新配置基因组活性.
- PU.1对染色质的招募取决于IKKβ活性.
- 炎症激活的基因含有RUNX因子基因,表明与GATA因子的合作.
- GATA2抑制了,而RUNX1促进了PU.1传感炎症的机制.
结论:
- 低GATA2原始体具有独特的炎症感应能力,由PU.1.介导.
- GATA2,RUNX1和PU.1之间的相互作用对原始基因组对炎症的反应至关重要.
- 了解这些机制可以深入了解骨髓衰竭和白血病病原性.
相关概念视频
01:01Regulation of Hematopoietic Stem Cells
4.2K
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
4.2K
01:15Differentiation of Common Myeloid Progenitor Cells
4.1K
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...
4.1K
01:19Multipotency of Hematopoietic Stem Cells
4.0K
The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
4.0K
01:21Hematopoiesis
9.5K
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...
9.5K
01:21Lineage Commitment
4.5K
Commitment is the process whereby stem cells:
4.5K
01:28Role of Hematopoietic Growth Factors
4.2K
Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
Thrombopoietin (TPO), mainly released by the liver,...
4.2K