Profiling genes differentially expressed in NGX6 overexpressed nasopharyngeal carcinoma cells by cDNA array.
OBJECTIVE
To investigate the role of the NGX6 gene in carcinoma proliferation and profile the downstream genes regulated by NGX6 in a nasopharyngeal carcinoma (NPC) cell line.


METHODS
We established a NPC cell line with NGX6 overexpression by gene transfection. Subsequently, a high-density cDNA array was used to identify differentially expressed genes in NGX6-overxepressed cells. Four differentially expressed genes or EST(expressed sequence tags) were examined using Northern blot. Furthermore, flow cytometry was employed to analyze the percentages of cells in the G(0)-G(1), S, and G(2)-M phase of the cell cycle in a NGX6 overexpression cell line.


RESULTS
Fifty-five genes and ESTs were differentially expressed after NGX6 transfection in a cDNA array assay. Several genes related to cell cycle and transcription regulation were identified using this technique. Flow cytometry analysis showed NGX6 overexpression can increase the length of the G(1) phase of the cell cycle in NPC cells.


CONCLUSIONS
We demonstrated the existence of a panel of genes that can be regulated by NGX6. Overexpression of NGX6 can influence the distribution of the cell cycle in NPC cells. Further studies are necessary to elucidate the exact function of these genes and their relationship to NGX6 expression.
Ma
Jian
J
Cancer Research Institute, Xiang-Ya School of Medicine, Central South University, 88 Xiang-Ya road, Changsha, Hunan, 410078, PR China.
Li
Jiang
J
Zhou
Jie
J
Li
Xiao-Ling
XL
Tang
Ke
K
Zhou
Ming
M
Yang
Jian-Bo
JB
Yan
Qun
Q
Shen
Shou-Rong
SR
Hu
Geng-Xi
GX
Li
Gui-Yuan
GY
D002277:Carcinoma / Q000235:genetics*; D020224:Expressed Sequence Tags; D005434:Flow Cytometry; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008969:Molecular Sequence Data; D009303:Nasopharyngeal Neoplasms / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D011994:Recombinant Proteins / Q000378:metabolism; D013489:Suppression, Genetic; D014162:Transfection; D014407:Tumor Cells, Cultured
D011994:Recombinant Proteins