期刊
EUROPEAN JOURNAL OF HAEMATOLOGY
卷 93, 期 3, 页码 214-223出版社
WILEY
DOI: 10.1111/ejh.12327
关键词
linker for activation of T cells; severe aplastic anemia; T lymphocytes
类别
资金
- National Natural Science Foundation of China [30971285, 30971286, 30670886, 30470749, 81370607, 81170472]
- Tianjin Municipal Natural Science Foundation [08JCYBJC07800, 09JCYBJC11200, 12JCZDJC21500]
- Tianjin Science and Technology support key project plan [07ZCGYSF00600]
- Health Industry Research and Special Projects [201202017]
- Tianjin Cancer Research of Major Projects [12ZCDZSY17900, 12ZCDZSY18000]
Objective: Severe aplastic anemia (SAA) is a rare immune-regulated disease characterized by severe pancytopenia and bone marrow failure, caused by destruction of hematopoietic cells by the activated T lymphocytes. Linker for activation of T cells (LAT), a transmembrane adaptor protein, plays a key role in T-cell and mast cell functions. However, it remains unclear how LAT may change in patients with SAA. This study aims at understanding the role of lymphocyte LAT in SAA. Methods: The expression of LAT, related signaling molecules, and T-cell effector molecules was determined by flow cytometry. LAT mRNA was evaluated by quantitative real-time PCR. Cytokine production by cultured T cells was determined by ELISA. Results: Patients with SAA had an increased levels of LAT and both total phosphorylated LAT and of the related molecule (ZAP-70) in circulating T cells compared with normal controls. In patients with SAA, the expression of LAT was positively associated with the expression of perforin and granzyme B in CD8(+) T cells. Inhibition of LAT expression in T cells from patients with SAA decreased the activation of the CD4(+) and CD8(+) T-cell subsets. Overexpression of LAT in T cells from normal controls increased the activation of CD4(+) and CD8(+) T-cell subsets with increased apoptosis of K562 cells in coculture. Conclusions: Our findings demonstrate that dysregulation of LAT expression and activation may contribute to over-function of T cells, imbalance of Th1/Th2 subsets and thus lead to hematopoiesis failure in SAA. Immunosuppressive therapy dramatically reduced the expression of LAT making it an attractive therapeutic target in SAA.
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