Abstract |
MicroRNAs ( miRNAs, miRs) play important roles in pathogenesis and development of human diseases, including malignancy. Some may affect tumor progression through targeting tumor suppressor genes. MiR-135b has been shown to be upregulated in CRC. In this study, we evaluated the role of miR-135b in colorectal cancer (CRC) and its regulatory role for metastasis suppressor-1 (MTSS1) and its mechanisms. The levels of miR-135b and MTSS1 gene expression in 35 CRC and corresponding cancer-adjacent tissues, 27 colorectal adenoma, and 16 normal tissue samples were quantified using qRT-PCR and western blot analysis. The effect of miR-135b on MTSS1 expression was assessed by miR-135b mimics or inhibitor transfection to deregulate miR-135b expression. The direct interaction between them was verified by 3'-UTR dual- luciferase reporter assay. Furthermore, the roles of miR-135b in regulating CRC cells migration and invasion properties were analyzed with miR-135b mimics or inhibitor-transfected cells and silenced expression of MTSS1 in miR-135b inhibitor transfected cells. CRC tissues showed significantly upregulated miR-135b expression and reduced MTSS1 expression. High miR-135b levels were significantly associated with lymph node and distant metastasis. The miR-135b inhibitor decreased miR-135b expression and caused MTSS1 upregulation at the post-transcriptional level. However, overexpression of miR-135b caused MTSS1 protein downregulation. The 3'-UTR of MTSS1 harbored a binding site for miR-135b. Finally, miR-135b inhibitor-transfected cells exhibited markedly reduced cell migration and invasive abilities, and this effect could be reversed by MTSS1-siRNA. Our results demonstrated that miR-135b downregulated MTSS1 expression and contributed to CRC cell invasion, indicating its involvement in CRC progression.
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Authors | Weiyun Wu, Zhuang Wang, Pengchun Yang, Jingfang Yang, Jian Liang, Yuanhong Chen, Hao Wang, Guoli Wei, Shicai Ye, Yu Zhou |
Journal | Molecular and cellular biochemistry
(Mol Cell Biochem)
Vol. 388
Issue 1-2
Pg. 249-59
(Mar 2014)
ISSN: 1573-4919 [Electronic] Netherlands |
PMID | 24343340
(Publication Type: Journal Article)
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Chemical References |
- 3' Untranslated Regions
- MIRN135 microRNA, human
- MTSS1 protein, human
- MicroRNAs
- Microfilament Proteins
- Neoplasm Proteins
- RNA, Small Interfering
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Topics |
- 3' Untranslated Regions
(genetics)
- Binding Sites
(genetics)
- Cell Line, Tumor
- Cell Movement
(genetics)
- Cell Proliferation
- Colorectal Neoplasms
(genetics, pathology)
- Female
- Gene Expression Regulation, Neoplastic
- HCT116 Cells
- Humans
- Lymphatic Metastasis
(genetics, pathology)
- Male
- MicroRNAs
(antagonists & inhibitors, biosynthesis, genetics)
- Microfilament Proteins
(biosynthesis, genetics)
- Middle Aged
- Neoplasm Invasiveness
(genetics, pathology)
- Neoplasm Proteins
(biosynthesis, genetics)
- RNA Interference
- RNA, Small Interfering
- Wound Healing
(drug effects, genetics)
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