On how Rac controls hematopoietic stem cell activity.

On how Rac controls hematopoietic stem cell activity.
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DOI:
10.1111/j.1537-2995.2011.03378.x
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发表时间:
2011-11
期刊:
影响因子:
2.9
通讯作者:
Cancelas JA
Cancelas JA
中科院分区:
医学3区
文献类型:
--
作者:
Cancelas JA

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Rac GTP酶形成Rho小GTP酶家族的一部分。与其他Rho家族GTP酶一样,Rac GTP酶是控制外部信号转导至细胞质和细胞核效应物的关键分子开关。遗传学和药理学工具的发展使得Rac GTP酶在造血干细胞(HSC)中的特定作用得到了更精确的定义。我们目前的知识已经能够剖析它们的特定和冗余角色。Rac GTP酶在造血干细胞对造血微环境信号的应答中起重要作用。本文就Rac GTP酶对HSC的粘附、迁移、滞留、增殖和存活等功能的调控以及Rac与HSC生理功能的关系作一综述。具有干扰Rac GT3活化的能力的小分子抑制剂的开发提供了在体内和离体操纵HSC功能的新的治疗策略。
Rac GTPases form part of the family of Rho small GTPases. Rac GTPases like other Rho family GTPases, are key molecular switches controlling the transduction of external signals to cytoplasmic and nuclear effectors. The development of genetic and pharmacological tools has allowed a more precise definition of the specific roles of Rac GTPases in hematopoietic stem cells (HSCs). Our current knowledge has enabled the dissection of their specific and redundant roles. Rac GTPases are now known to be crucial in the response of HSCs response to hematopoietic microenvironment cues. This review will briefly summarize the known HSC functions which are regulated by Rac GTPases, focusing on adhesion, migration, retention, proliferation, and survival, and how Rac relates to the physiological functions of HSCs. The development of small molecule inhibitors with the ability to interfere with Rac GTPase activation offers new therapeutic strategies to manipulate the function of HSC in vivo and ex vivo.
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