Dual mechanisms of 9-beta-D-arabinofuranosylguanine resistance in CEM T-lymphoblast leukemia cells.

Dual mechanisms of 9-beta-D-arabinofuranosylguanine resistance in CEM T-lymphoblast leukemia cells.
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CEM T 淋巴细胞白血病细胞中 9-β-D-阿拉伯呋喃鸟嘌呤抗性的双重机制。

DOI:
10.1006/bbrc.2001.5124
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发表时间:
2001
影响因子:
3.1
通讯作者:
A. Karlsson
A. Karlsson
中科院分区:
生物学4区
文献类型:
--
作者:
S. Curbo;C. Zhu;M. Johansson;J. Balzarini;A. Karlsson

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鸟嘌呤核苷类似物araG对T淋巴母细胞具有选择性毒性,最近在治疗T细胞来源的淋巴恶性肿瘤方面显示出前景。然而,这种组织选择性细胞毒性的分子机制尚不清楚。AraG被线粒体脱氧鸟苷激酶和胞质/核脱氧胞苷激酶磷酸化,从而被线粒体脱氧鸟苷激酶和胞质/核脱氧胞苷激酶激活。我们最近发现,araG主要被纳入癌细胞系的线粒体DNA中,这表明线粒体作为其药理学靶点的作用。在本研究中,我们产生了araG耐药CEM T淋巴母细胞系,并表明araG耐药可能通过两种不同的分子机制发生,这两种机制可以依次发生。第一种机制与araG掺入线粒体DNA的减少有关,第二种机制与dCK活性丧失有关。
The guanine nucleoside analog araG is selectively toxic to T-lymphoblasts and has recently shown promise in treatment of lymphoid malignancies of T-cell origin. The molecular mechanism of this tissue-selective cytotoxicity is, however, yet unclear. AraG is phosphorylated, and thereby pharmacologically activated, by the mitochondrial deoxguanosine kinase and the cytosolic/nuclear deoxycytidine kinase. We have recently shown that araG is predominantly incorporated into mitochondrial DNA of cancer cell lines, which suggests a role of mitochondria as its pharmacological target. In the present study, we have generated araG-resistant CEM T-lymphoblast cell lines and show that araG resistance may occur by two separate molecular mechanisms that can occur sequentially. The first mechanism is associated with a decrease of araG incorporation into mitochondrial DNA, and the second event is associated with loss of dCK activity.
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发表时间: 1991-02-01
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