MicroRNA-148b suppresses cell growth by targeting cholecystokinin-2 receptor in colorectal cancer.

Abstract:

:MicroRNAs (miRNAs) play an important role in the regulation of a variety of cellular processes, including cell growth, differentiation, apoptosis and carcinogenesis. The purpose of this study was to elucidate the molecular mechanisms by which miR-148b acts as a tumor suppressor in colorectal cancer. The expression of miR-148b was significantly downregulated in 96 pairs of human colorectal cancer tissues (p<0.0001) and three cell lines (p<0.01) compared with non-tumor adjacent tissues by quantitative real-time PCR. The results of in situ hybridization highlighted that miR-148b was important in the cancer transformation process. Using statistical analysis, we found that the expression level of miR-148b was associated with tumor size (p=0.033) in colorectal cancer patients. Moreover, overexpression of miR-148b in HCT-116 and HT-29 cells could inhibit cell proliferation in vitro and suppress tumorigenicity in vivo. Importantly, the result of luciferase activity assay and western blot showed that the cholecystokinin-2 receptor gene (CCK2R) was a target of miR-148b and was downregulated by miR-148b at the translational level. Then, we used siRNA, radioimmunoassay and ELISA to demonstrate that miR-148b might have an effect on cell proliferation by regulating the expression of CCK2R which functioned depending on the gastrin in colorectal cancer. Taken together, our data provides the first evidences that miR-148b acts as a tumor suppressor in colorectal cancer and should be further evaluated as a biomarker and therapeutic tool against colorectal cancer.

journal_name

Int J Cancer

authors

Song Y,Xu Y,Wang Z,Chen Y,Yue Z,Gao P,Xing C,Xu H

doi

10.1002/ijc.26485

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

1042-51

issue

5

eissn

0020-7136

issn

1097-0215

journal_volume

131

pub_type

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