缺少ATM的小鼠胸部T细胞淋巴细胞淋巴瘤是PTEN缺乏的,需要AKT信号才能生存
Joseph B An1, Karen S Hathcock1, Seth M Steinberg2
1National Cancer Institute (NCI), National Institutes of Health (NIH), Experimental Immunology Branch, Bethesda, MD, United States of America.
PloS one
|December 5, 2024
概括
没有阿塔克西亚特朗吉克塔西亚突变 (ATM) 激酶的小鼠会发展为淋巴瘤. 大多数ATM缺陷淋巴瘤失去PTEN表达,依靠AKT信号来生存,为人类T细胞急性淋巴细胞白血病提供了一个模型.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 突变的 (ATM) 激酶缺乏症会损害细胞应激反应.
- 缺乏ATM的小鼠会发展出类似于人类T细胞急性淋巴细胞白血病 (T-ALL) 的胸腺T细胞淋巴细胞淋巴瘤 (T-LBL).
- 一个PI3K/AKT/mTOR通路调节者PTEN,以前在一些ATM缺陷的T-LBL中被发现被删除,但其频率和影响尚不清楚.
研究的目的:
- 确定ATM缺陷的T-LBL中PTEN变化的频率和后果.
- 调查AKT信号传递在这些淋巴瘤生存中的作用.
- 评估ATM缺陷的T-LBLs作为人类T-ALL模型的实用性.
主要方法:
- 在已建立的ATM缺乏的T-LBL培养物中对基因组Pten变异的分析.
- 评估PTEN蛋白表达和AKT信号激活 (pAKT).
- 对泛AKT抑制剂MK-2206的T-LBL敏感性的评估.
主要成果:
- 大多数缺乏ATM的T-LBL培养物表现出各种基因组Pten变异,缺乏功能性PTEN蛋白.
- 所有的T-LBL都表现出构成性的pAKT表达,表明激活了AKT信号.
- T-LBL对MK-2206敏感,表明对AKT信号的生存依赖.
- 没有恶性瘤的ATM缺陷胸细胞保持正常的PTEN水平,缺乏pAKT.
结论:
- 缺少ATM的胸膜T-LBL经常失去PTEN表达.
- 这些淋巴瘤依赖于AKT信号传递才能生存.
- 缺乏ATM的T-LBLs代表了一种有价值的临床前模型,用于研究人类T-ALL中的PI3K/AKT/mTOR通路失调.
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