New transgenic mouse models enabling pan-hematopoietic or selective hematopoietic stem cell depletion in vivo.

New transgenic mouse models enabling pan-hematopoietic or selective hematopoietic stem cell depletion in vivo.
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DOI:
10.1038/s41598-022-07041-6
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发表时间:
2022-02-24
期刊:
影响因子:
4.6
通讯作者:
Forsberg EC
Forsberg EC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Rodriguez Y Baena A;Rajendiran S;Manso BA;Krietsch J;Boyer SW;Kirschmann J;Forsberg EC

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造血干细胞 (HSC) 的多能性和自我更新通常是通过连续移植实验来定义的。宿主调节对于 HSC 的稳健植入是必要的,可能是通过减少免疫介导的排斥反应和清除有限的 HSC 生态位空间来实现的。由于受体小鼠的辐射是非特异性的且具有广泛的破坏性,因此需要开发替代模型来研究 HSC 在稳态和没有辐射诱导应激的情况下的性能。我们已经生成并表征了两种新的小鼠模型,其中所有造血细胞或仅 HSC 都可以在体内或体外被特异性诱导死亡。在“Vav-DTR”小鼠中,造血特异性 Vav1 介导的 loxP 侧翼白喉毒素受体 (DTR) 表达使所有造血细胞对白喉毒素 (DT) 敏感。将这些小鼠与 Flk2-Cre 小鼠杂交会产生“HSC-DTR”小鼠,该小鼠表现出 HSC 选择性 DT 敏感性。我们在这些模型中展示了稳健、快速和高度选择性的细胞消融。这些新的小鼠模型提供了一个平台来测试体内长期造血是否需要HSC,了解调节HSC植入的机制,并探讨体内造血分化途径和调节造血稳态的机制。
Hematopoietic stem cell (HSC) multipotency and self-renewal are typically defined through serial transplantation experiments. Host conditioning is necessary for robust HSC engraftment, likely by reducing immune-mediated rejection and by clearing limited HSC niche space. Because irradiation of the recipient mouse is non-specific and broadly damaging, there is a need to develop alternative models to study HSC performance at steady-state and in the absence of radiation-induced stress. We have generated and characterized two new mouse models where either all hematopoietic cells or only HSCs can be specifically induced to die in vivo or in vitro. Hematopoietic-specific Vav1-mediated expression of a loxP-flanked diphtheria-toxin receptor (DTR) renders all hematopoietic cells sensitive to diphtheria toxin (DT) in “Vav-DTR” mice. Crossing these mice to Flk2-Cre mice results in “HSC-DTR” mice which exhibit HSC-selective DT sensitivity. We demonstrate robust, rapid, and highly selective cell ablation in these models. These new mouse models provide a platform to test whether HSCs are required for long-term hematopoiesis in vivo, for understanding the mechanisms regulating HSC engraftment, and interrogating in vivo hematopoietic differentiation pathways and mechanisms regulating hematopoietic homeostasis.
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