| Modeling NOTCH1 driven T-cell Acute Lymphoblastic Leukemia in Mice
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Author:
Date:
2020-05-20
[Abstract] T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy that arises from transformation of T-cell primed hematopoietic progenitors. Although T-ALL is a heterogenous and molecularly complex disease, more than 65% of T-ALL patients carry activating mutations in the NOTCH1 gene. The majority of T-ALL–associated NOTCH1 mutations either disrupt the negative regulatory region, allowing signal activation in the absence of ligand binding, or result in truncation of the C-terminal PEST domain involved in the termination of NOTCH1 signaling by proteasomal degradation. To date, retroviral transduction models have relied heavily on the overexpression of aggressively truncated variants of NOTCH1 (such as ICN1 or ΔE-NOTCH1), which result in ...
[摘要] [摘要 ] T细胞急性淋巴细胞白血病（T-ALL）是一种侵袭性血液恶性肿瘤，其起源于T细胞引发的造血祖细胞的转化。尽管T-ALL是一种异质且分子复杂的疾病，但超过65％的T-ALL患者在NOTCH1 基因中带有激活突变。大多数与T-ALL相关的NOTCH1 突变要么破坏负调控区，允许在没有配体结合的情况下激活信号，要么导致蛋白酶体降解终止NOTCH1信号终止所涉及的C末端PEST域被截短。迄今为止，逆转录病毒转导模型在很大程度上依赖于侵袭性截短的变种的过度表达。 NOTCH1 （例如ICN1或ΔE-NOTCH1）可导致信号传导的超生理水平，并且在人类T-ALL中很少见。当前方案描述了小鼠骨髓分离，造血干细胞和祖细胞（HSC）富集，然后逆转录病毒转导的致癌突变体形式的NOTCH1受体（NOTCH1-L1601P-ΔP）的方法，该方法与获功能突变最常见于患者样品中。组成型活性NOTCH1的这种强制表达的标志是胸腺外未成熟T细胞发育的瞬时波，此波在致癌性转化为T-ALL之前。此外，该方法通过允许白血病细胞与微环境之间的串扰来模拟体内白血病的转化和进展，这是基于细胞系的体外研究无法解释的一个方面。因此，HSC转导和移植模型更真实地概括了人类疾病的发展，为进一步的体内和离体功能研究提供了高度全面和通用的工具。
[背景 ] ...
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| In vivo BrdU Incorporation Assay for Murine Hematopioetic Stem Cells
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Author:
Date:
2013-11-05
[Abstract] Bromodeoxyuridine (BrdU) is a thymidine analog that is incorporated into DNA during the S-phase of the cell cycle. As such, BrdU incorporation can be used to quantify the number of cells that are in S-phase in the time period during which BrdU is available. The following protocol describes an in vivo BrdU incorporation assay as a measure of cell proliferation in adult murine hematopioetic stem cells (HSCs). Specifically, BrdU incorporation was analyzed for long-term HSCs (LT-HSCs, Lin-Sca-1+c-Kit+CD34-CD135-), Short-term HSCs (ST-HSCs, Lin-Sca-1+c-Kit+CD34+CD135-) and multipotent progenitors (MPPs, Lin-Sca-1+c-Kit+CD34+CD135+) population.
[摘要] 溴脱氧尿苷（BrdU）是在细胞周期的S期期间掺入DNA的胸苷类似物。 因此，BrdU掺入可用于定量在BrdU可用的时间段内处于S期的细胞的数量。 以下方案描述了体内BrdU掺入测定作为成体鼠造血干细胞（HSC）中细胞增殖的量度。 具体地，分析BrdU掺入的长期HSC（LT-HSC，Lin-Sca-1 + c-Kit + CD34 - CD135 - ），短期HSC（ST-HSC，Lin-Sca-1 + c-Kit + CD34 和多能祖细胞（MPP，Lin-Sca-1 + c-Kit + CD34 + > CD135 + ）群体
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