Ming Li1, Ying Wang1, Yongsheng Song1, Renge Bu1, Bo Yin1, Xiang Fei1, Qizhen Guo1, Bin Wu1. 1. 1 Department of Urology, Shengjing Hospital of China Medical University, Shenyang 110004, China ; 2 Department of Cell Biology, Harvard Medical School, Boston, MA, 02115, USA ; 3 Department of Nuclear Medicine, The First Affiliated Hospital of China Medical University, Shenyang 110001, China.
Abstract
OBJECTIVE: To better understand the contribution of dysregulated DNA methyltransferase 1 (DNMT1) expression to the progression and biology of clear cell renal cell carcinoma (ccRCC). METHODS: We examined the differences in the expression of DNMT1 in 89 ccRCC and 22 normal tissue samples by immunohistochemistry. In addition, changes in cell viability, apoptosis, colony formation and invading ability of ccRCC cell lines (786-0 and Caki-1) were assessed after transfection with DNMT1 siRNA. RESULTS: We found DNMT1 protein was significantly higher expressed in ccRCC than that of in no-tumor tissues (56.2% and 27.3%, respectively, P=0.018). The expression of DNMT1 was strongly associated with ccRCC tumor size, tumor pathology stage, histological grading, lymph node metastasis, vascular invasion, recurrence and prognosis. Moreover, knockdown of DNMT1 expression significantly inhibited ccRCC cell viability, induced apoptosis, decreased colony formation and invading ability. CONCLUSIONS: Expression of DNMT1 protein is increased in ccRCC tissues, and DNMT1 expression is associated with poor prognosis of patients. Experiments in vitro further showed DNMT1 played an essential role in proliferation and invasion of renal cancer cells. Moreover, targeting this enzyme could be a promising strategy for treating ccRCC, as evidenced by inhibited cell viability, increased apoptosis, decreased colony formation and invading ability.
OBJECTIVE: To better understand the contribution of dysregulated DNA methyltransferase 1 (DNMT1) expression to the progression and biology of clear cell renal cell carcinoma (ccRCC). METHODS: We examined the differences in the expression of DNMT1 in 89 ccRCC and 22 normal tissue samples by immunohistochemistry. In addition, changes in cell viability, apoptosis, colony formation and invading ability of ccRCC cell lines (786-0 and Caki-1) were assessed after transfection with DNMT1 siRNA. RESULTS: We found DNMT1 protein was significantly higher expressed in ccRCC than that of in no-tumor tissues (56.2% and 27.3%, respectively, P=0.018). The expression of DNMT1 was strongly associated with ccRCC tumor size, tumor pathology stage, histological grading, lymph node metastasis, vascular invasion, recurrence and prognosis. Moreover, knockdown of DNMT1 expression significantly inhibited ccRCC cell viability, induced apoptosis, decreased colony formation and invading ability. CONCLUSIONS: Expression of DNMT1 protein is increased in ccRCC tissues, and DNMT1 expression is associated with poor prognosis of patients. Experiments in vitro further showed DNMT1 played an essential role in proliferation and invasion of renal cancer cells. Moreover, targeting this enzyme could be a promising strategy for treating ccRCC, as evidenced by inhibited cell viability, increased apoptosis, decreased colony formation and invading ability.
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