As2O3对慢性粒细胞白血病原代细胞BCR-ABL蛋白水平及信号转导的影响

目的：阐述As2O3对慢性粒细胞白血病（CML）原代细胞BCR－ABL及信号转导的影响。方法：采用免疫沉淀、蛋白酪氨酸激酶（protein tyrosine kinase,PTK)活性测定和Western印迹、实时定量PCR等方法。结果：1．0μmol/L和2．0μmol/L As2O3作用48h,CML患者骨髓单个核细胞BCR／ABL蛋白含量下调,0．5μmol/L时无明显改变。在0．5μmol/L As2O3作用下STAT1蛋白下调,1．5μmol/L和2．0μmol/L时下调更明显。P27蛋白无变化。As2O3作用60h,可使CML患者骨髓单个核细胞BCR－ABL蛋白PTK活性轻度下降。As2O3对bcr-abl融合基因的mRNA表达无明显影响。结论：As2O3下调BCR－ABL蛋白STAT1蛋白水平,减弱BCR－ABL信号的下传。As2O3下调PTK活性。

Effects of As2O3 on BCR-ABL protein level and signal transduction in CML cells

OBJECTIVE: To explore the effects of As(2)O(3) on BCR-ABL protein level and signal transduction in chronic myeloid leukemia (CML) cells. METHODS: Immunoprecipitation, protein tyrosine kinase (PTK) activity assay, real-time Taqman quantitative PCR and Western blot were used. RESULTS: As(2)O(3) downregulated BCR-ABL protein and STAT1 protein of CML mononuclear cells in the concentrations of 1.0 approximately 2.0 micro mol/L and 0.5 approximately 2.0 micro mol/L after 48 h exposure, respectively. However, p27 protein level was not affected. The PTK activity of BCR-ABL protein was also mildly decreased in CML monouclear cells at 60 h. The bcr-abl mRNA level remained unchanged. CONCLUSION: As(2)O(3) downregulats BCR-ABL protein, STAT1 protein, BCR-ABL signal transduction and PTK activity in CML cells.