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相关概念视频

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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...
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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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...
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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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重复性DNA元素的转录信号阻断了造血干细胞的细胞化

Cecilia Pessoa Rodrigues1,2, Joseph M Collins1,2, Song Yang1

  • 1Howard Hughes Medical Institute, Boston Children's Hospital Boston, MA, USA.

Science (New York, N.Y.)
|September 12, 2024
PubMed
概括

血造干细胞 (HSC) 的质量通过巨细胞的相互作用得到维持. 这项研究将Beta-2-微球蛋白 (B2m) 确定为"不要吃我"信号,揭示了HSC增殖和克隆性是如何调节的.

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科学领域:

  • 血液学
  • 免疫学
  • 干细胞生物学

背景情况:

  • 巨细胞通过细胞表面的卡尔雷蒂库林 (Calr) 作为"吃我"信号来维护造血干细胞 (HSC) 的功能.
  • 反应性氧物种 (ROS) 诱导卡尔表达,信号巨细胞清除老化或受损的HSCs.

研究的目的:

  • 识别高细胞与巨细胞相互作用的新型调节剂.
  • 了解HSC质量控制和扩散的分子机制.

主要方法:

  • 斑马鱼的遗传学可以识别关键的调节分子.
  • 对调节HSC表面标记物的化合物进行化学选.
  • 全基因组CRISPR-Cas9查以确定调节β-2-微球蛋白 (B2m) 表达的基因.
  • 对重复元素 (RE) 转录和托尔类受体3 (Tlr3) 信号的分析.

主要成果:

  • 乙-2-微球蛋白 (B2m) 被确定为HSC的关键"不要吃我"信号.
  • 化学查发现了促进HSC增殖的Calr诱导剂,而不会增加ROS或巨细胞清除量.
  • 发现托尔类受体3 (Tlr3) 信号调节B2m表达.
  • 针对B2m或Tlr3降低了HSC克隆性,而B2m升高与高RE转录表达相关.

结论:

  • 在HSC上卡尔瑞图林 (Calr) 和β - 2微球蛋白 (B2m) 之间的平衡调节了巨细胞的相互作用.
  • 与重复元素相关的双链RNA可能与TLR3相互作用,在造血干细胞和原始细胞上调节B2m.
  • 这些发现为定义造血克隆性和HSC质量控制机制提供了洞察力.