MicroRNA-135b regulates metastasis suppressor 1 expression and promotes migration and invasion in colorectal cancer.

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.

journal_name

Mol Cell Biochem

authors

Wu W,Wang Z,Yang P,Yang J,Liang J,Chen Y,Wang H,Wei G,Ye S,Zhou Y

doi

10.1007/s11010-013-1916-z

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

249-59

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

388

pub_type

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