MALAT1 sponges miR-106b-5p to promote the invasion and metastasis of colorectal cancer via SLAIN2 enhanced microtubules mobility

EBioMedicine
Meng ZhuangXishan Wang

Abstract

The low expression of miR93/25 (members of miR-106b~25 cluster) promoted the invasion and metastasis of colon cancer cells, which predicted poor survival. However, the role of miR-106b-5p, the member of miR-106b~25 cluster, in colorectal cancer (CRC) remains unclear. Bioinformatics methods were used to predict the potential pairs of lncRNA-miRNA-mRNA. In situ hybridization and qPCR were used to evaluate the expression of MALAT1 and miR-106b-5p in the paraffin-embedded normal and CRC tissues. Kaplan-Meier analysis with the log-rank test was used for survival analyses. Immunohistochemistry staining was applied to investigate the expression of SLAIN2. Fluorescence recovery after photobleaching assay was applied to observe the microtubule (MT) mobility. In vitro and in vivo invasion and metastasis assays were used to explore the function of MALAT1/miR-106b-5p/SLAIN2 in the progression of CRC. miR-106b-5p was identified as a suppressor in CRC. Functionally, ectopic or silencing the expression of miR-106b-5p inhibited or promoted the invasion and metastasis of CRC cells in vitro and in vivo. The long non-coding RNA MALAT1 regulated the miR-106b-5p expression and further mediated the mobility of SLAIN2-related MTs by functioning as a ...Continue Reading

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Methods Mentioned

BETA
immunoprecipitation
pull-down
pulldown
transfection
fluorescence recovery after photobleaching
PCR
electrophoresis
RIP
RNAseq

Software Mentioned

KMplot
SPSS

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