ABSTRACT
Objective To investigate the role and regulatory mechanism of micro RNA-9-3 (miR-9-3)in the pathogenesis of chronic lymphocytic leukemia.Methods Using the methylation specific PCR (MSP)technology to detect 8 cases of normal bone marrow tissue and peripheral blood,78 cases of bone marrow tissue came from the chronic lymphocytic leukemia pateints newly diagnosed and the methylation level of 7 kinds of leukemia cell line.Used Western blot to detected the NF-kappa B1 signal transduction pathway activation levels of methylation positive leukemia cell line.Results The miR-9-3 of normal control group were in the negative methylation status.Only I83-E95 and WAC3CD5+ were in positive methylation status in seven kinds of leukemia cell line (the positive of MSP was 28.6%);65 cases occurred miR-9-3 methylated in 78 of chronic lymphocytic leukemia patients (the positive of MSP was 83%).I83-E95 and miR-9-3 cells of WAC3CD5+ were in the methylation state when treatment with 5-nitrogen-2’-deoxidization cytidine (5-Aza2’Dc).Conclusion The abnormal methylation of miR-9-3 were usually seenin chronic lymphocytic leukemia,it could lead to abnormal hyperplasis in cancer cells.The methylation of miR-9-3 could inhibit the activation of NF-kappa B1 signal pathway suggested that it could sup-press the apoptosis of cancer cells through this pathways to trogered the progression of disease.The inhibitor of methylation could be induced the demethylation of leukemia cell lines,so it is possible that miR-9-3 maight be a new gene targets for the treatment of chronic lymphocytic leukemia.