Effect of Ras inhibition in hematopoiesis and BCR/ABL leukemogenesis.

Effect of Ras inhibition in hematopoiesis and BCR/ABL leukemogenesis.
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DOI:
10.1186/1756-8722-1-5
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发表时间:
2008-06-05
影响因子:
28.5
通讯作者:
Ren R
Ren R
中科院分区:
医学1区
文献类型:
--
作者:
Baum KJ;Ren R

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Ras小GTP酶在许多造血生长因子信号传导和血液恶性肿瘤中被激活,但其在造血和白血病发生中的作用尚不完全清楚。在这里,我们研究了显性负突变的Ras,N17 H-Ras,在成人造血和BCR/ABL白血病的抑制作用,使用小鼠骨髓转导和移植的方法。我们发现N17 H-Ras表达抑制B和T淋巴细胞生成和红细胞生成。有趣的是,N17 H-Ras不抑制骨髓中的骨髓生成,但它大大减弱了BCR/ABL诱导的慢性粒细胞白血病(CML)样骨髓增生性疾病。大多数BCR/ABL + N17 H-Ras小鼠最终发展为前B淋巴母细胞白血病/淋巴瘤(B-ALL)。这些结果表明,Ras活化是淋巴细胞和红系细胞的发育所必需的,但不是髓系细胞,Ras是CML发病机制中BCR/ABL的关键靶点,但不是B-ALL。
Ras small GTPases are activated in many hematopoietic growth factor signaling and in hematological malignancies, but their role in hematopoiesis and leukemogenesis is not completely known. Here we examined the effect of Ras inhibition by a dominant negative mutant of Ras, N17 H-Ras, in adult hematopoiesis and in BCR/ABL leukemogenesis using the mouse bone marrow transduction and transplantation approach. We found that N17 H-Ras expression suppressed B- and T-lymphopoiesis and erythropoiesis. Interestingly, N17 H-Ras did not suppress myelopoiesis in the bone marrow, yet it greatly attenuated BCR/ABL-induced chronic myelogenous leukemia (CML)-like myeloproliferative disease. Most BCR/ABL + N17 H-Ras mice eventually developed pro-B lymphoblastic leukemia/lymphoma (B-ALL). These results suggest that Ras activation is essential for the development of lymphoid and erythroid cells but not myeloid cells and that Ras is a critical target of BCR/ABL in the pathogenesis of CML, but not B-ALL.
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