摘要目的 研究microRNA-21(miR-21)、PTEN、NF-κB、Caspase-9在结肠癌中的表达及在肿瘤进展中的可能机制.方法 检测结肠癌、结肠腺瘤及正常黏膜中上述指标的表达及凋亡细胞百分率.结果 miR-21、PTEN、NF-κB、Caspase-9阳性表达率在正常黏膜中分别为0.39±0.02、50％、25％、50％,在结肠腺瘤中分别为0.62±0.06、50％、35％、55％,在结肠癌中分别为0.88 ±0.04、30％、75％、20％.凋亡细胞百分率分别为(24.64±7.66)％、(15.86±1.44)％、(6.20±2.57)％(均P ＜0.05). miR-21与TNM分期、浸润深度、分化程度及NF-κB表达呈正相关,与PTEN、Caspase-9表达及凋亡细胞百分率呈负相关(r =0.647、0.297、0.259、0.519、-0.299、-0.388、-0.931,P均＜0.05).结论 结肠癌中miR-21高表达可能通过下调PTEN、Caspase-9、上调NF-κB、从而抑制细胞凋亡参与肿瘤进展.

abstractsObjective To investigate expressions of microRNA-21 (miR-21),PTEN,NF-κB,and caspase-9 in colon carcinoma and their possible mechanisms in progression of tumor.Methods Expressions of above-mentioned indexes and percentage of apoptotic cells in colon carcinoma,colon adenoma,and normal tissue specimen were detected.Results Expressions of miR-21,PTEN,N F-κB,and caspase9 in normal tissue were 0.39 ±0.02,50％,25％,and 50％.Expressions of them in colon adenoma were 0.62 ±0.06,50％,35％,and 55％,and those in colon carcinoma were 0.88 ±0.04,30％,75％,and 20％.Percentage of apoptotic cells were (24.64 ± 7.66) ％,(15.86 ± 1.44) ％,and (6.20 ± 2.57) ％,respectively.The above P-values were all less than 0.05.Expression of miR-21 was positively correlated with TNM stage,depth of infiltration,differentiated level and expression of NF-κB while inversely correlated with PTEN and caspase-9 expressions and percentage of apoptotic cells.The r-values were 0.647,0.297,0.259,0.519,-0.299,-0.388,and-0.931,respectively.Conclusions Hyperexpression of miR-21 participated in progression of colon carcinoma probably through down-regulating expressions of PTEN and caspase-9 and up-regulating expression of NF-κB and then suppressing cell apoptosis.