p53-dependent senescence delays Emu-myc-induced B-cell lymphomagenesis.

p53-dependent senescence delays Emu-myc-induced B-cell lymphomagenesis.
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DOI:
10.1038/onc.2009.423
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发表时间:
2010-03-04
期刊:
影响因子:
8
通讯作者:
Lozano, G.
Lozano, G.
中科院分区:
医学1区
文献类型:
--
作者:
Post, S. M.;Quintas-Cardama, A.;Terzian, T.;Smith, C.;Eischen, C. M.;Lozano, G.

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p53 依赖性细胞周期停滞和衰老对 Eμ-myc 诱导的 B 细胞淋巴瘤发展的影响仍存在争议。为了解决这个问题,我们将 Eμ-myc 小鼠与 p53515C 突变小鼠杂交,编码突变的 p53R172P 蛋白,该蛋白保留了激活细胞周期抑制剂和衰老激活剂 p21 的能力。重要的是,该突变体缺乏激活 p53 依赖性凋亡基因的能力。因此,携带两个 p53515C 等位基因的 Eμ-myc 小鼠完全有 p53 依赖性细胞凋亡缺陷。 Eμ-myc::p53515C/515C 和 Eμ-myc::p53515C/+ 小鼠的存活时间均显着长于 Eμ-myc::p53+/- 小鼠,表明 p53 依赖性非凋亡途径在 B 细胞淋巴瘤发生中的重要性。此外,p53515C等位基因在一些Eμ-myc::p53515C/+淋巴瘤中被删除,进一步强调了p53R172P在肿瘤抑制中的功能。 Eμ-myc::p53515C/515C 和 Eμ-myc::p53515C/+ 小鼠的淋巴瘤保留了上调 p21 的能力,导致细胞衰老。在 Eμ-myc::p53+/+、Eμ-myc::p53515C/515C 和 Eμ-myc::p53515C/+ 小鼠的淋巴瘤中观察到衰老相关的 β-半乳糖苷酶 (SA β-gal) 活性,但在 Eμ-myc::p53+/- 小鼠分离的淋巴瘤中未观察到。因此,在不存在 p53 依赖性细胞凋亡的情况下,p53R172P 诱导衰老的能力导致 B 细胞淋巴瘤发展显着延迟。
The effect of p53-dependent cell-cycle arrest and senescence on Eμ-myc-induced B-cell lymphoma development remains controversial. To address this question, we crossed Eμ-myc mice with the p53515C mutant mouse, encoding the mutant p53R172P protein that retains the ability to activate the cell-cycle inhibitor and senescence activator p21. Importantly, this mutant lacks the ability to activate p53-dependent apoptotic genes. Hence, Eμ-myc mice that harbor two p53515C alleles are completely defective for p53-dependent apoptosis. Both Eμ-myc::p53515C/515C and Eμ-myc::p53515C/+ mice survive significantly longer than Eμ-myc::p53+/− mice, indicating the importance of the p53-dependent non-apoptotic pathways in B-cell lymphomagenesis. In addition, the p53515C allele is deleted in several Eμ-myc::p53515C/+ lymphomas, further emphasizing the functionality of p53R172P in tumor inhibition. Lymphomas from both Eμ-myc::p53515C/515C and Eμ-myc::p53515C/+ mice retain the ability to upregulate p21, resulting in cellular senescence. Senescence-associated β-galactosidase (SA β-gal) activity was observed in lymphomas from Eμ-myc::p53+/+, Eμ-myc::p53515C/515C and Eμ-myc::p53515C/+ mice but not in lymphomas isolated from Eμ-myc::p53+/− mice. Thus, in the absence of p53-dependent apoptosis, the ability of p53R172P to induce senescence leads to a significant delay in B-cell lymphoma development.
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发表时间: 1995-09-26
影响因子: 11.1
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