Abstract
To investigate a novel suicide gene for nasopharyngeal carcinoma (NPC) therapy, the yCDglyTK gene was constructed by fusing yeast cytosine deaminase (CD) and herpes simplex type 1 thymidine kinase. The expression of the yCDglyTK gene was detected by RT-PCR and Western blotting, and its bioactivity was demonstrated by an MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay. An animal study was carried out in which BALB/C nude mice bearing yCDglyTK gene-modified tumors were treated with prodrugs and radiation. Our results revealed that the yCDglyTK gene could be expressed in CNE-2 cells in vitro. In MTT analysis, at the transfection rate of 10%, 66% cells were killed. The synergistic effect of CD and TK showed 91% of yCDglyTK-transfected cells were killed with the treatment of 5-fluorocytosine (5-FC) alone, 60% killed with ganciclovir (GCV) alone, and 75% killed with 5-FC and GCV together. In vivo, the tumor volume in all of the four prodrugs and/or radiation-treated groups were significantly different from that in the PBS-controlled group (P<.01); also yCDglyTK+prodrug+radiation group was different from the other three groups (P<.05). Our findings suggested there was a synergistic antitumor effect when combining suicide gene therapy and radiation, and yCDglyTK has potent antitumor efficacy and may be a candidate suicide gene for cancer therapy.
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Abbreviations
- NPC:
-
nasopharyngeal carcinoma
- CD:
-
cytosine deaminase
- HSV-1 TK:
-
herpes simplex type 1 thymidine kinase
- 5-FC:
-
5-fluorocytosine
- GCV:
-
ganciclovir
- 5-FdUMP:
-
5-fluoro-2′-deoxyuridine 5′-monophosphate
- 5-FUTP:
-
5-fluorouridine 5′-triphosphate
- 5-FUDP:
-
5-fluorouridine 5′-diphosphate
- 5-FdUDP:
-
5-fluoro-2′-deoxyuridine 5′-diphosphate
- 5-FdUTP:
-
5-fluoro-2′-deoxyuridine 5′-triphosphate
- Egr-1:
-
early growth response factor 1
- DPD:
-
dihydropyrimidine dehydrogenase
- UPRT:
-
uracil phosphoribosyltransferase
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Acknowledgements
We thank Professor Stephen E Christmas from University of Liverpool for his critical review of the manuscript. This work was financially supported by the grants of State 863 project (No. 2002AA227011 and 2001AA217181), 973 project, state natural science foundation program (No. 31830200) and the Ministry of Education of China (No. 00-01).
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Xia, K., Liang, D., Tang, A. et al. A novel fusion suicide gene yeast CDglyTK plays a role in radio-gene therapy of nasopharyngeal carcinoma. Cancer Gene Ther 11, 790–796 (2004). https://doi.org/10.1038/sj.cgt.7700728
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DOI: https://doi.org/10.1038/sj.cgt.7700728
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