The expression profile of microRNAs in a model of 7,12-dimethyl-benz[a]anthrance-induced oral carcinogenesis in Syrian hamster.
BACKGROUND
Non-coding RNA molecules, such as microRNAs, may play an important role in carcinogenesis. Recent studies have indicated that microRNAs are involved in initiation and progression of various malignancies. However, little work has been done to compare the microRNA expression patterns in oral cancer. In this study, we constructed an animal model of oral squamous cell carcinoma to investigate expression profiles of microRNAs in oral carcinogenesis.


METHODS
The animal model of oral squamous cell carcinoma was conducted by tri-weekly (Monday, Wednesday, and Friday) painting with 5% DMBA in acetone. Six Syrian hamsters, including three from the treated group and three from the control group, were used as a training group for microRNA microarray analysis. All microarray data were analyzed by Significance Analysis of Microarrays (SAM) and CLUSTER 3.0 software, and this result was further confirmed by qRT-PCR assay.


RESULTS
Seventeen microRNAs were differentially expressed in oral squamous cell carcinoma. Five microRNAs (hsa-miR-21, hsa-miR-200b, hsa-miR-221, hsa-miR-338, and mmu-miR-762) were significantly upregulated and twelve microRNAs (hsa-miR-16, hsa-miR-26a, hsa-miR-29a, hsa-miR-124a, hsa-miR-125b, mmu-miR-126-5p, hsa-miR-143, hsa-miR-145, hsa-miR-148b, hsa-miR-155, hsa-miR-199a, and hsa-miR-203) were down-regulated in cancer tissues. The expression levels of hsa-miR-21 and hsa-miR-16 seen with Stem-loop qRT-PCR were also seen in microarray analysis in all samples.


CONCLUSIONS
Our findings identified specific microRNA expression in oral squamous cell carcinoma and suggested that microRNAs have a role in oral carcinogenesis.
Yu
Tao
T
Department of Oral Maxillofacial Surgery, West China College of Stomatology, Sichuan University, No,14, Sec,3, Renminnan Road, Chengdu, Sichuan 610041, PR China. cjyt2006@163.com
Wang
Xiao-yi
XY
Gong
Ren-guo
RG
Li
An
A
Yang
Sen
S
Cao
Yu-tang
YT
Wen
Yu-ming
YM
Wang
Chang-mei
CM
Yi
Xin-zhu
XZ
D015127:9,10-Dimethyl-1,2-benzanthracene / Q000494:pharmacology*; D000818:Animals; D002273:Carcinogens / Q000494:pharmacology*; D002471:Cell Transformation, Neoplastic / Q000139:chemically induced* / Q000235:genetics* / Q000473:pathology; D006224:Cricetinae; D004195:Disease Models, Animal; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects / Q000235:genetics; D008297:Male; D008647:Mesocricetus; D035683:MicroRNAs / Q000235:genetics*; D009062:Mouth Neoplasms / Q000139:chemically induced* / Q000235:genetics* / Q000473:pathology
D002273:Carcinogens; D035683:MicroRNAs; D015127:9,10-Dimethyl-1,2-benzanthracene