八度结合转录因子4在60Co辐射后通过NF-κB信号通路抑制HSC功能
Wenjing Yang1, Xiaoe Jin2, Chao Chen1
1Laboratory Animal Science Department, Basic Medical School, Naval Medical University, Shanghai, China.
Radiation research
|April 29, 2025
概括
八合体结合转录因子4 (Oct4) 在辐射诱导的骨髓损伤中起着关键作用. 抑制Oct4或核因子kappa-B (NF-κB) 保护造血干细胞,并改善辐射后的存活率.
科学领域:
- 辐射生物学 辐射生物学
- 干细胞生物学 干细胞生物学
- 分子瘤学分子瘤学
背景情况:
- 高剂量的辐射会对造血干细胞 (HSC) 造成严重的,不可逆转的损伤,目前没有有效的保护策略可用.
- 辐射暴露会导致严重的骨髓损伤,影响HSC功能和生存.
研究的目的:
- 为了研究八聚体结合转录因子4 (Oct4) 在辐射诱导的造血干细胞亡中的作用.
- 探索针对Oct4/NF-κB通路作为防护辐射损伤的保护策略的潜力.
主要方法:
- 利用全身辐射的小鼠模型来评估HSC损伤.
- 进行了转录组测序和基因功能分析,以确定关键的调节因素.
- 采用染色体免疫沉 (ChIP) 测试来确定Oct4结合点.
- 研究了Oct4淘汰和NF-κB抑制对HSC和动物生存的影响.
主要成果:
- 在放射后的HSC中,Oct4表达显著增加.
- Oct4删除或NF-κB抑制降低了HSC亡,增强了殖民地形成,并促进了骨髓再生.
- 发现Oct4可以结合IKK促进剂,增加IKK水平并促进NF-κB进入核.
- 抑制Oct4或NF-κB改善了被辐射的小鼠的生存率.
- 人类白血病细胞中Oct4的表达减少,其过度表达增加了白血病细胞辐射后的亡.
结论:
- 在通过NF-κB通路进行辐射后,Oct4调解HSC亡.
- 准Oct4和NF-κB为保护造血干细胞和骨髓功能免受辐射损伤提供了一个有希望的生物医学策略.
- 研究结果表明,一种潜在的治疗方法可以减轻辐射引起的损伤,并改善白血病患者的治疗结果.
相关概念视频
Regulation of Hematopoietic Stem Cells
3.2K
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...
3.2K
NF-κB-dependent Signaling Pathway
7.3K
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The...
NF-κB-dependent Signaling Mechanism
The...
7.3K
Role of Hematopoietic Growth Factors
1.3K
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,...
1.3K
Methods of Nuclear Reprogramming
1.8K
Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
1.8K
General Transcription Factors
5.2K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
5.2K
Multipotency of Hematopoietic Stem Cells
3.0K
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...
3.0K


