Original Article

Construction of lentivirus-based inhibitor of hsa-microRNA-338-3p with specific secondary structure

Authors: Kai Sun, Chen Guo, Hai-jun Deng, Jing-qing Dong, Shang-tong Lei, Guo-xin Li
DOI: 10.1038/aps.2012.172

Abstract

Kai SUN1, *, Chen GUO2, Hai-jun DENG1, Jing-qing DONG1, Shang-tong LEI1, Guo-xin LI1

1Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China; 2School of Biotechnology, Southern Medical University, Guangzhou 510515, China

Aim: To construct a lentivirus-based inhibitor with specific secondary structure that could exert long-term suppression on microRNA-338-3p (miR-338-3p), thus elucidating its molecular function in colorectal carcinoma cells.

Methods: The miR-338-3p inhibitor sequence was synthesized and inserted into pLV-THM plasmid. HEK-293T cells were co-transfected with the lentiviral vectors pLV-THM-miR-338-3p-inhibitor, psPAX2, and pMD2.G. The supernatant containing the lentivirus particles was harvested to determine the viral titer, and then used to infect colorectal carcinoma-derived SW-620 cells. eGFP(+) cells were sorted using flow cytometry. The expression of miR-338-3p in SW-620 cells was determined with real-time RT-PCR, and the expression of the smoothened (SMO) protein was detected using Western blot analysis. The migration ability of the transfected SW-620 cells was assessed with transwell assay.

Results: Restriction endonuclease analysis and DNA sequencing demonstrated that the lentiviral vector pLV-THM-miR-338-3p-inhibitor was successfully constructed. The expression of miR-338-3p in SW-620 cells was significantly decreased by infection with the lentivirus pLV-THM-miR-338-3p-inhibitor. Moreover, the down-regulated expression of miR-338-3p caused up-regulated expression of the SMO protein in SW-620 cells, which showed significantly enhanced migration in transwell assay.

Conclusion: The construction of the lentiviral vector pLV-THM-miR-338-3p-inhibitor with specific secondary structure provides a basis for further studies the molecular function of miR-338-3p in colorectal carcinoma. miR-338-3p may suppress SMO gene expression and thereby inhibit colorectal carcinoma migration.


Keywords: microRNAs (miRNAs); colorectal carcinoma; hsa-miR-338-3p; lentivirus

This research is supported by a grant from the National Natural Science Foundation of China (No 81101896).
* To whom correspondence should be addressed.
E-mail sunkai9602@sina.com
Received 2012-05-26 Accepted 2012-09-03
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