MicroRNA miR-886-5p inhibits apoptosis by down-regulating Bax expression in human cervical carcinoma cells.
OBJECTIVE
MicroRNA (miRNA) plays an essential role in the progression of a variety of cancers, but its role in cervical cancer progression is not well defined. We aimed to test whether special miRNAs and their target mRNAs contribute to cervical cancer progression.


METHODS
The expression profiles of 1145 microRNAs in cervical squamous cell carcinomas (CSCC) and adjacent non-tumor tissues were investigated using an Illumina microRNA microarray platform. Differentially expressed miRNAs were validated by RT-PCR. Downstream target validation was performed for miR-886-5p.


RESULTS
We found that the expression levels of seven miRNAs differed significantly between CSCC tissues and adjacent non-tumor tissues. Forced expression of one miRNA, miR-886-5p, over-expressed in CSCC tissues lowered expression of the pro-apoptotic protein Bax, reduced apoptosis and promoted cell proliferation in H8, an HPV16-immortalized human cervical squamous epithelial cell line. Knockdown of miR-886-5p increased Bax protein and apoptotic cell death in cells of the cervical squamous carcinoma cell line, SiHa.


CONCLUSIONS
MicroRNA miR-886-5p inhibits apoptosis of cervical cancer cells by down-regulating the production of Bax.
Department of Biochemistry and Molecular Biology, Cancer Institute, Capital Medical University, Beijing, China.
Jing-Hua
JH
Li
Xue
X
Xiao
Yao-Nan
YN
Zhang
Ya-Mei
YM
Wang
Li-Min
LM
Feng
Yu-Mei
YM
Wu
Yu-Xiang
YX
Zhang
D000328:Adult; D017209:Apoptosis / Q000235:genetics*; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D048708:Cell Growth Processes / Q000235:genetics; D015536:Down-Regulation; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D035683:MicroRNAs / Q000096:biosynthesis / Q000235:genetics; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D002583:Uterine Cervical Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D051028:bcl-2-Associated X Protein / Q000096:biosynthesis* / Q000235:genetics
C494826:BAX protein, human; D035683:MicroRNAs; D012333:RNA, Messenger; D051028:bcl-2-Associated X Protein