Wang XY, Shen SR, Liu HY, Zhang XM, Peng C, Huang H, Liu F, Li XL, Li GY. Effects of tumor suppressor gene NGX6 on growth of human colon cancer cell line HT-29.
Shijie Huaren Xiaohua Zazhi 2004;
12:574-579. [DOI:
10.11569/wcjd.v12.i3.574]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: NGX6 is a novel tumor suppressor gene candidate, and the expression of NGX6 decreased in colon cancer specimen, which suggested that the down-regulation of NGX6 was closely related to tumorigenesis of colon cancer. This study was designed to explore effects of NGX6 on the cytobiological characteristics of human colon cancer cell line HT-29 and to elucidate the role of NGX6 in the colon cancer.
METHODS: The mammal expression vector of pcDNA3.1(+)/NGX6 was transfected into human colon cancer cell line HT-29 cells by liposome.The integration of the exogenous vector DNA and the expression of NGX6 were detected by dot blot and RT-PCR. Finally, the cytobiological characteristics of positive clone were analyzed by growth curves of cells, MTT, soft agar assay, FCM and xenograft.
RESULTS: pcDNA3.1(+)/NGX6/HT-29 cells grew slower than pcDNA3.1(+)/HT-29 and HT-29 cells (P < 0.05), and the PDT of pcDNA3.1(+)/NGX6/HT-29 cell was 34.5 hours, which was significantly longer than that of pcDNA3.1(+)/HT-29 cells (27.1 h) and HT-29 cells (23.0 h). FCM data showed that the overexpression of NGX6 blocked the progression of G1→S phase in cell cycle, and it also presented decreased clonogenicity in soft agar assay and tumor formation in nude mice.
CONCLUSION: The re-expression of NGX6 can reverse the malignant phenotype of human colon cancer cell line HT-29. Therefore, NGX6 gene may be a good candidate of tumor suppressor gene associated with colon cancer.
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