摘要
目的探讨细胞因子信号转导抑制蛋白(suppressor of cytokine signaling,SOCS)基因超甲基化在经典型骨髓增殖性肿瘤(MPD)中的临床作用及其机制。方法采用甲基化特异性PCR方法检测SOCS1、2、3基因CpG岛甲基化发生情况,直接测序法检测100例MPD患者JAK2V617F突变情况,用实时定量PCR方法检测SOCS1、2、3的mRNA表达情况。结果100例MPD患者中有27例(27%)存在SOCS1基因超甲基化,9例(9%)存在SOCS2基因超甲基化,34例(34%)存在SOCS3基因超甲基化。在100例MPN患者中,64例(64%)JAK2V617F突变阳性。MPD患者中SOCS1和SOCS3基因超甲基化组与未甲基化组相比,其SOCS1和SOCS3基因mRNA表达量明显减少(P〈0.05);SOCS1和SOCS3基因JAK2V617F突变组与野生型组相比,其SOCS1和SOCS3基因mRNA表达量明显减少(P〈0.05)。结论MPD患者中存在JAK2V617F突变及SOCS基因超甲基化,且JAK2V617F突变和SOCS基因甲基化导致SOCSmRNA表达水平降低,SOCS超甲基化和JAK2V617F突变可改变JAK—STAT信号通路等的转录活性而最终影响疾病的发展,这些改变可能代表了一种潜在的治疗方向。
Objective To investigate the clinical role of hypermethylation of suppressor of cytokine signaling (SOCS) on typical myeloproliferative dieses (MPD) patients and its mechanism. Methods Methylation specific PCR was used to detect SOCS1,2,3 methylation, direct DNA sequencing was performed to detect JAK2V617F mutation, real-time fluorescence quantitative PCR were applied to evaluate transcriptional activity of SOCS1,2,3. Results Among 100 MPD patients, hypermethylation of SOCSI was detected in 27 ( 27 % ), hypermethylation of SOCS2 in 9 ( 9% ), hypermethylation of SOCS3 in 34 ( 34% ) ; JAK2V617F mutation in 64 (64%). Hypermethylation of SOCS1,3 greatly inhibited gene expression compared with unmethylated ones (P 〈 0.05). Presence of JAK2V617F mutation markedly down-regulated SOCS1, 3 gene mRNA expression compared with wild JAK2V617F ( P 〈 0.05). Conclusion Hypermethylation of SOCS1,3 and JAK2V617F mutation exist in MPD, which inhibited SOCS1,3 gene expression. SOCS hypermethylation and JAK2V617F mutation can activate JAK - STAT signaling pathways, these observations may provide a potential therapeutic direction.
出处
《中华血液学杂志》
CAS
CSCD
北大核心
2011年第11期772-776,共5页
Chinese Journal of Hematology
基金
基金项目:国家自然科学基金(30871080、30572161)
教育部新世纪优秀人才(81070430)