Regulation of the transcription factor NF-kappaB1 by microRNA-9 in human gastric adenocarcinoma.

Molecular Cancer
Hai-Ying WanHua Tang

Abstract

MicroRNAs (miRNAs) are a new class of naturally occurring, small, non-coding RNAs that regulate protein-coding mRNAs by causing mRNA degradation or repressing translation. The roles of miRNAs in lineage determination and proliferation, as well as the localization of several miRNA genes at sites of translocation breakpoints or deletions, have led to speculation that miRNAs could be important factors in the development or maintenance of the neoplastic state. We showed that miR-9 was downregulated in human gastric adenocarcinoma. Overexpression of miR-9 suppressed the growth of human gastric adenocarcinoma cell line MGC803 cell as well as xenograft tumors derived from them in SCID mice. Bioinformatics analysis indicated a putative miR-9 binding site in the 3'-untranslated region (3'UTR) of the tumor-related gene NF-kappaB1 mRNA. In an EGFP reporter system, overexpression of miR-9 downregulated EGFP intensity, and mutation of the miR-9 binding site abolished the effect of miR-9 on EGFP intensity. Furthermore, both the NF-kappaB1 mRNA and protein levels were affected by miR-9. Finally, knockdown of NF-kappaB1 inhibited MGC803 cell growth in a time-dependent manner, while ectopic expression of NF-kappaB1 could rescue MGC803 cell from...Continue Reading

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Methods Mentioned

BETA
transfection
PCR
Xenograft
Fluorescence

Software Mentioned

[UNK] Image Acquisition and Analysis Software ( UVP )
TargetScan
MatchMiner
Lab
PicTar

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