Abstract:
:Evidence has shown that microRNAs play important roles in tumor development, progression, and metastasis. miR-128 has been reported to be deregulated in different tumor types, whereas the function of miR-128 in colorectal carcinoma (CRC) largely remains to be elucidated. The aim of the present study was to investigate the clinical significance, biological effects and underlying mechanisms of miR-128 in CRC using reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and western blotting. It was found that the expression of miR-128 was downregulated in CRC tissues and cell lines as determined by RT-qPCR. Furthermore, the expression of miR-128 in tumor tissues was significantly negatively correlated with TNM stage and lymph node metastasis in CRC patients. Functional assay revealed that the overexpression of miR-128 inhibited CRC cell proliferation, colony formation, migration and invasion and promoted apoptosis in vitro, and suppressed CRC xenograft tumor growth in vivo. In addition, insulin receptor substrate 1 (IRS1), a key mediator in oncogenic insulin-like growth factor (IGF) signaling, was confirmed as a direct target of miR-128 by a luciferase reporter assay. Western blot analysis indicated that the overexpression of miR-128 significantly downregulated IRS1 expression and its downstream Akt signaling in CRC cells. Moreover, miR-128 was negatively associated with IRS1 in CRC tissues compared to adjacent non-tumor tissues. Taken together, these data suggested that miR-128 serves as a tumor suppressor and blocks CRC growth and metastasis by targeting IRS1.
journal_name
Oncol Repjournal_title
Oncology reportsauthors
Wu L,Shi B,Huang K,Fan Gdoi
10.3892/or.2015.4251subject
Has Abstractpub_date
2015-11-01 00:00:00pages
2797-805issue
5eissn
1021-335Xissn
1791-2431journal_volume
34pub_type
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