胃腺癌组织中miR-23a与转移抑制因子1的表达及意义

目的：探讨miR-23a与转移抑制因子1（MTSS1）在胃腺癌组织中的表达及其临床意义。方法：运用荧光素报告载体系统检测miR-23a直接调控的靶基因并采用Transwell侵袭实验检测miR-23a对人胃腺癌细胞的侵袭能力。收集胃腺癌患者手术标本46例，癌旁组织作为正常对照，分别运用原位杂交，免疫组织化学EnVision法检测胃腺癌组织及癌旁组织中miR-23a，MTSS1的表达水平，并对二者进行相关性分析。结果：MTSS1是miR-23a直接调控的靶基因，miR-23a下调MTSS1蛋白的表达，增强胃癌细胞的侵袭能力。在46例胃腺癌组织中miR-23a阳性表达率为87．0％（40／46），MTSS1蛋白阳性表达率为17．4％（8／46），分别与癌旁对照组比，差异有统计学意义（P〈0．01）；miR-23a的表达随胃腺癌临床分期演化（P〈0．05）和浸润深度增加（P〈0．01），且有淋巴结转移的miR-23a的表达显著高于无淋巴结转移组（P〈0．05）；MTSS1l的表达随胃腺癌临床分期演化（P〈0．05）和浸润深度增加而下调（P〈0．05），且有淋巴结转移的MTSS1的表达显著低于无淋巴结转移组（P〈0．01）；相关性分析表明，miR-23a表达与MTSS1的表达呈显著负相关（r=-0．594，P〈0．05）。结论：miR-23a通过靶向抑制MTSS1促进胃腺癌细胞生长，侵袭转移；miR-23a的高表达和MTSS1蛋白低表达可能是胃腺上皮恶性转化以及胃癌发生浸润转移的重要生物学标志，检测二者对预测胃癌侵袭及转移有重要意义。

Expression and Clinical Significance of miR-23a and Metastasis Suppressor 1 From Tissue of Gastric Adenocarcinoma

Objective To investigate the expression of miR-23a and metastasis suppressor 1 （MTSS1） and their clinical significance in gastric adenocarcinoma. Methods A total of 46 cases of gastric adenocarcinoma were collected with both the tumor and paired normal tissue samples for the study. The miR-23a targeting MTSS1 was evaluated by luciferase reporter vector. Cell invasion potential was evaluated by transwell invasion assay. In sita hybridization and immunohistochemistry were used to detect miR-23a and MTSS1 expression Results miR-23a down regulated the expression of MTSS protein and enhanced the invasiveness of gastric adenocarci- noma. The expression rates of miR-23a and MTSS1 showed 87.0% （40/46）and 17.4% （8/46） in gastric adenocareinoma cases, re- spectively（P 〈0.01 ）. The up-regulation of miR-23a expression was associated with an advanced clinical stage（ P 〈 0.05 ） and depth of invaaion（P 〈 0.01 ）. The expression of miR-23a proved higher in the tumors with lymph node metastasis than those without（P 〈 0.05 ）. Downregulation of MTSS1 expression was associated with an advanced clinical stage （ P 〈 0. 05 ） and depth of invasion （ P 〈 0.05 ）. The expression of MTSS1 indicated lower in the tumors with lymph node metastasis than those without（P 〈 0.01 ）. The expression of miR-23a had significantly negative correlation with that of MTSS1 （ r = - 0.594, P 〈 0.05 ）. Conclusion MiR-23 a expression promotes gastric adenocarcinoma cell growth, invasion and metastasis through inhibition of MTSS 1 gene. Both the low expression of MTSS1 and high expression of miR-23a may serve as important biological markers for the malignant phenotypes of gastric carcinoma, such as invasion and metastasis.