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  • Title: Up-regulation of TIMP-2 expression promotes SHI-1 leukemic cells proliferation and infiltration in immunodeficiency mice.
    Author: Li Z, Chen Z, Cen J, He J, Qiu Q, Xue Y.
    Journal: Chin Med J (Engl); 2014; 127(24):4243-9. PubMed ID: 25533828.
    Abstract:
    BACKGROUND: MMPs and TIMPs play important roles in tumor angiogenesis and invasion. Studies have shown that TIMP-2 has two roles in tumor invasion. However, its role in leukemic infiltration has not been well investigated. This study explored the roles of TIMP-2 in extramedullary infiltration of acute monocytic leukemic SHI-1 cells both in vitro and in vitro. METHODS: A retroviral vector carrying the human TIMP-2 cDNA was constructed and transfected into the monocytic leukemic cell line SHI-1. The expression of TIMP-2 in the positive clones was determined. The proliferation of SHI-1 cells was examined by MTT assay. Trans-Matrigel invasion assays were used to investigate the infiltration ability in vitro. SHI-1 cells were intravenously injected into pre-treated nu/nu mice to investigate the infiltration ability feature in vitro. RESULTS: The expression of TIMP-2 on the cell membrane was significantly elevated in SHI-1/TIMP-2 cells. Over-expression of TIMP-2 promoted the cells proliferation and the invasions in vitro. The SHI-1/TIMP-2 cells demonstrated higher infiltration ability when intravenously injected into nu/nu mice. CONCLUSION: Over-expression of TIMP-2, especially on the cell membrane, may play important roles in promoting the proliferation and infiltration of SHI-1 leukemic cells.
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