期刊
BLOOD
卷 116, 期 26, 页码 6003-6013出版社
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2010-05-283937
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资金
- National Institutes of Health
- Diabetes and Immune Disease National Research Institute
Hyperactivation of the transcription factor Stat5 leads to various leukemias. Stat5 activity is regulated by the protein phosphatase SHP-1 in a phospholipase C (PLC)-beta 3-dependent manner. Thus, PLC-beta 3-deficient mice develop myeloproliferative neoplasm, like Lyn (Src family kinase)deficient mice. Here we show that Lyn/PLC-beta 3 doubly deficient lyn(-/-); PLC-beta 3(-/-) mice develop a Stat5-dependent, fatal myelodysplastic/myeloproliferative neoplasm, similar to human chronic myelomonocytic leukemia (CMML). In hematopoietic stem cells of lyn(-/-); PLC-beta 3(-/-) mice that cause the CMML-like disease, phosphorylation of SHP-1 at Tyr(536) and Tyr(564) is abrogated, resulting in reduced phosphatase activity and constitutive activation of Stat5. Furthermore, SHP-1 phosphorylation at Tyr(564) by Lyn is indispensable for maximal phosphatase activity and for suppression of the CMML-like disease in these mice. On the other hand, Tyr(536) in SHP-1 can be phosphorylated by Lyn and another kinase(s) and is necessary for efficient interaction with Stat5. Therefore, we identify a novel Lyn/PLC-beta 3-mediated regulatory mechanism of SHP-1 and Stat5 activities. (Blood. 2010; 116(26):6003-6013)
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