Objective:To investigate the effect of up‐regulating miR‐519d on proliferation and apoptosis of laryngeal squamous cell carcinoma .Methods:The expression of signal transducer and activator of transcription 3 (STAT3) and miR‐519d in human laryngeal carcinoma epithelium cell line Hep‐2 and human bronchial epithelium cell (HBE ) were detected by real‐time fluorescent quantitative polymerase chain reaction (RT‐PCR) and Western blotting .After up‐regulating miR‐519d expression in Hep‐2 cell line by plasmid transfection technique ,the proliferation and apoptosis of transfected cells and control cells was detected by proliferation and apoptosis assays .Results:STAT3 mRNA expression in Hep‐2 cells was significantly higher than that in HBE cells (P<0 .05) .However ,miR‐519d expression in Hep‐2 cells was significantly lower than that in HBE cells (P<0 .05) .The STAT3 mRNA expression in the transfected Hep‐2 cells decreased significantly .During 0 and 7 day of post‐transfection culture ,proliferation rate of transfected Hep‐2 cells was significantly lower than that of untransfected cells (P<0 .05) .After 24 h culture ,the apoptosis rate of miR‐519d transfected cells was (2 .8 ± 0 .15)% ,while that of control cells was (0 .92 ± 0 .09)% (P=0 .000 4) .After 72 h culture ,the apoptosis rate of miR‐519d transfected cells was (23 .06 ± 3 .52)% , while that of control cells was (23 .26 ± 2 .56)% (P=0 .965 5) .Conclusions:STAT3 shows high expression in Hep‐2 cell , while the related miR‐519d shows low expression .By up‐regulating miR‐519d ,STAT3 expression could be suppressed ,so as to suppress the proliferation of tumor cells and promote the apoptosis of tumor cells .%目的：研究miR‐519d对喉鳞癌细胞增殖及凋亡的调控作用。方法：采用RT‐PCR、Western印迹等技术检测人喉癌上皮细胞株Hep‐2及人支气管上皮细胞（human bronchial epithelium cell ，HBE）中信号转导和转录激活子3（signal transducer and activator of transcription 3，STAT3）以及miR‐519d的表达情况；通过质粒转染上调Hep‐2细胞株中miR‐519d的表达后，采用细胞增殖及凋亡检测技术观察转染细胞与对照细胞的增殖及凋亡情况。结果：STAT3 mRNA在 Hep‐2中的表达明显高于其在HBE细胞中的表达（P＜0．05），而miR‐519d在 Hep‐2中的表达明显低于其在 HBE中的表达（P＜0．05）。STAT3在转染miR‐519d后的 Hep‐2细胞中的表达明显下降（P＜0．05）。转染后继续培养0～7 d ，转染后 Hep‐2细胞的增殖率明显低于未转染细胞（P＜0．05）。转染后继续培养24 h ，转染miR‐519d的细胞凋亡率为（2．80±0．15）％，对照细胞的凋亡率为（0．92±0．09）％（P＝0．0004）。转染后继续培养72 h ，转染miR‐519d的细胞凋亡率为（23．06±3．52）％，对照细胞的凋亡率为（23．26±2．56）％（P＝0．9655）。结论：STAT3在 Hep‐2细胞中高表达，而相关的miR‐519d呈低表达，通过上调miR‐519d可以抑制STAT3的表达从而抑制肿瘤细胞的增殖，促进肿瘤细胞的凋亡。
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