title: MicroRNA-23a promotes the growth of gastric adenocarcinoma cell line MGC803 and downregulates interleukin-6 receptor.
abstract: MicroRNAs are an evolutionarily conserved class of endogenous noncoding RNAs that modulate gene expression at the post-transcriptional level. Recently, microRNA-23a (miR-23a) has been found to function as a growth-promoting and antiapoptotic factor in hepatocellular carcinoma cells. Our previous study showed that miR-23a was significantly upregulated in gastric adenocarcinoma tissues. In this study, we found that miR-23a promoted the proliferative potential of gastric adenocarcinoma cell line MGC803. We also identified IL6R as a direct target gene for miR-23a using a fluorescent reporter assay. The mRNA and protein levels of IL6R were both inversely correlated with the miR-23a expression level. Our results demonstrate that miR-23a can target IL6R and promote the growth activity of gastric adenocarcinoma cells in vitro. The downregulation of IL6R by miR-23a may explain why the suppression of miR-23a can inhibit gastric cancer cell proliferation.
authors.affiliation: Tianjin Life Science Research Center and Basic Medical School, Tianjin Medical University, Tianjin, China.
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Zhu
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Hua
authors.initials: H
authors.lastname: Tang
authors.forename: Rui-Qing
authors.initials: RQ
authors.lastname: Tian
authors.forename: Chang
authors.initials: C
authors.lastname: Su
authors.forename: Min
authors.initials: M
authors.lastname: Liu
authors.forename: Xin
authors.initials: X
authors.lastname: Li
mesh_terms: D020413:3' Untranslated Regions / Q000235:genetics; D000230:Adenocarcinoma / Q000235:genetics* / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015536:Down-Regulation; D020869:Gene Expression Profiling; D020868:Gene Silencing; D017930:Genes, Reporter; D006801:Humans; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism*; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000378:metabolism; D034741:RNA, Small Interfering; D019947:Receptors, Interleukin-6 / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000235:genetics* / Q000378:metabolism*; D014015:Tissue Banks; D015854:Up-Regulation
chemical_list: D020413:3' Untranslated Regions; C508603:IL6R protein, human; C552430:MIRN23a microRNA, human; D035683:MicroRNAs; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D019947:Receptors, Interleukin-6