期刊
JOURNAL OF EXPERIMENTAL MEDICINE
卷 212, 期 11, 页码 1833-1850出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20151323
关键词
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资金
- National Center for Advancing Translational Sciences [NCATS], National Institutes of Health [UL1 TR00038]
- Cancer Center Support Grant [P30CA016087]
- US National Institutes of Health [5RO1CA194923, 1R01CA169784, 1R01CA133379, 1R01CA105129, 1R01CA149655, 5R01CA173636]
- William Lawrence and Blanche Hughes Foundation
- Leukemia and Lymphoma Society (TRP) [6340-11]
- Leukemia and Lymphoma Society (LLS) [6373-13]
- Chemotherapy Foundation
- V Foundation for Cancer Research
- Alex's Lemonade Stand Foundation for Childhood Cancer
- St. Baldrick's Cancer Research Foundation
- Dutch Cancer Society [KWF BUIT2012-5358]
- Deutsche Jose Carreras Leukamie-Stiftung e.V.
- Howard Hughes Medical Institute
The cohesin complex (consisting of Rad21, Smc1a, Smc3, and Stag2 proteins) is critically important for proper sister chromatid separation during mitosis. Mutations in the cohesin complex were recently identified in a variety of human malignancies including acute myeloid leukemia (AML). To address the potential tumor-suppressive function of cohesin in vivo, we generated a series of shRNA mouse models in which endogenous cohesin can be silenced inducibly. Notably, silencing of cohesin complex members did not have a deleterious effect on cell viability. Furthermore, knockdown of cohesin led to gain of replating capacity of mouse hematopoietic progenitor cells. However, cohesin silencing in vivo rapidly altered stem cells homeostasis and myelopoiesis. Likewise, we found widespread changes in chromatin accessibility and expression of genes involved in myelomonocytic maturation and differentiation. Finally, aged cohesin knockdown mice developed a clinical picture closely resembling myeloproliferative disorders/neoplasms (MPNs), including varying degrees of extramedullary hematopoiesis (myeloid metaplasia) and splenomegaly. Our results represent the first successful demonstration of a tumor suppressor function for the cohesin complex, while also confirming that cohesin mutations occur as an early event in leukemogenesis, facilitating the potential development of a myeloid malignancy.
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