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Lymphoid Neoplasia: Cellular context-dependent effects of H2ax and p53 deletion on the development of thymic lymphoma

机译:淋巴瘤形成:H2ax和p53缺失对胸腺淋巴瘤发展的细胞背景依赖性影响

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摘要

H2AX and Artemis each cooperate with p53 to suppress lymphoma. Germline H2ax−/−p53−/− mice die of T-cell receptor-β (TCR-β) thymic lymphomas with translocations and other lesions characteristic of human T-cell acute lymphoblastic leukemia. Here, we demonstrate that mice with inactivation of H2ax and p53 in thymocytes die at later ages to TCR-β or TCR-β+ thymic lymphomas containing a similar pattern of translocations as H2ax−/−p53−/− tumors. Germline Artemis−/− p53−/− mice die of lymphomas with antigen receptor locus translocations, whereas Artemis−/−H2ax−/−p53−/− mice die at earlier ages from multiple malignancies. We show here that Artemis−/− mice with p53 deletion in thymocytes die of TCR-β tumors containing Tcrα/δ translocations, other clonal translocations, or aneuploidy, as well as Notch1 mutations. Strikingly, Artemis−/− mice with H2ax and p53 deletion in thymocytes exhibited a lower rate of mortality from TCR-β tumors, which harbored significantly elevated levels of genomic instability. Our data reveal that the cellular origin of H2ax and p53 loss impacts the rate of mortality from and developmental stage of thymic lymphomas, and suggest that conditional deletion of tumor suppressor genes may provide more physiologic models for human lymphoid malignancies than germline inactivation.
机译:H2AX和Artemis各自与p53协同抑制淋巴瘤。生殖系H2ax -/- p53 -/-小鼠死于T细胞受体-β-(TCR-β-)具有人T细胞急性淋巴细胞白血病特征性易位和其他病变的胸腺淋巴瘤。在这里,我们证明了胸腺细胞中具有H2ax和p53失活的小鼠在较晚的年龄死于TCR-β-或TCR-β + 胸腺淋巴瘤,它们具有相似的易位模式作为H2ax -/- p53 -/-肿瘤。生殖系Artemis -/- p53 -/-小鼠死于具有抗原受体基因座易位的淋巴瘤,而Artemis -/- H2ax - /- p53 -/-小鼠死于多种恶性肿瘤,年龄较轻。我们在这里显示,胸腺细胞中p53缺失的Artemis -/-小鼠死于TCR-β-肿瘤,其中TCRα/δ易位,其他克隆易位或非整倍性也是如此作为Notch1突变。令人惊讶的是,胸腺细胞中具有 H2ax p53 缺失的Artemis -/-小鼠表现出较低的TCR-β-< / sup>肿瘤,其基因组不稳定水平明显升高。我们的数据显示, H2ax p53 丢失的细胞起源会影响胸腺淋巴瘤的死亡率和发育阶段,并提示肿瘤抑制基因的条件缺失可能提供人类淋巴恶性肿瘤的生理模型要多于种系失活。

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