BCL-2 cooperates with promyelocytic leukemia retinoic acid receptor alpha chimeric protein (PMLRARalpha) to block neutrophil differentiation and initiate acute leukemia.

BCL-2 cooperates with promyelocytic leukemia retinoic acid receptor alpha chimeric protein (PMLRARalpha) to block neutrophil differentiation and initiate acute leukemia.
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BCL-2与临时细胞白血病视网膜酸受体α嵌合蛋白(PMLRARALALPHA)合作以阻断中性粒细胞分化并启动急性白血病。

DOI:
10.1084/jem.193.4.531
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发表时间:
2001-02-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Bishop JM
Bishop JM
中科院分区:
其他
文献类型:
--
作者:
Kogan SC;Brown DE;Shultz DB;Truong BT;Lallemand-Breitenbach V;Guillemin MC;Lagasse E;Weissman IL;Bishop JM

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早幼粒细胞白血病视黄酸受体 α (PMLRARα) 嵌合蛋白与急性早幼粒细胞白血病 (APL) 相关。 PMLRARα 转基因小鼠仅在几个月后才会患上白血病,这表明 PMLRARα 本身并不赋予完全恶性的表型。抑制细胞凋亡在肿瘤发生中发挥核心作用;因此,我们评估了 BCL-2 是否影响 PMLRARα 引发白血病的能力。对白血病前期动物的评估表明,单独的 PMLRARα 会适度改变中性粒细胞的成熟,而 PMLRARα 和 BCL-2 的组合会导致骨髓中未成熟骨髓细胞的显着积累。与单独表达 PMLRARα 的小鼠相比,共表达 PMLRARα 和 BCL-2 的小鼠白血病发展得更快,并且所有表达两种转基因的小鼠均在 7 个月时死于白血病。尽管白血病前期、双转基因小鼠和白血病动物的骨髓中都有丰富的早幼粒细胞,但只有白血病小鼠表现出血小板减少和未成熟细胞的播散。在白血病中发现了 7、8、10 和 15 号染色体的反复获得和 2 号染色体的反复丧失。这些染色体变化可能是抑制正常造血和急性白血病传播特征的原因。我们的结果表明,抑制细胞凋亡的基因变化可以与 PMLRARα 配合启动 APL。
The promyelocytic leukemia retinoic acid receptor α (PMLRARα) chimeric protein is associated with acute promyelocytic leukemia (APL). PMLRARα transgenic mice develop leukemia only after several months, suggesting that PMLRARα does not by itself confer a fully malignant phenotype. Suppression of apoptosis can have a central role in tumorigenesis; therefore, we assessed whether BCL-2 influenced the ability of PMLRARα to initiate leukemia. Evaluation of preleukemic animals showed that whereas PMLRARα alone modestly altered neutrophil maturation, the combination of PMLRARα and BCL-2 caused a marked accumulation of immature myeloid cells in bone marrow. Leukemias developed more rapidly in mice coexpressing PMLRARα and BCL-2 than in mice expressing PMLRARα alone, and all mice expressing both transgenes succumbed to leukemia by 7 mo. Although both preleukemic, doubly transgenic mice and leukemic animals had abundant promyelocytes in the bone marrow, only leukemic mice exhibited thrombocytopenia and dissemination of immature cells. Recurrent gain of chromosomes 7, 8, 10, and 15 and recurrent loss of chromosome 2 were identified in the leukemias. These chromosomal changes may be responsible for the suppression of normal hematopoiesis and dissemination characteristic of the acute leukemias. Our results indicate that genetic changes that inhibit apoptosis can cooperate with PMLRARα to initiate APL.
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