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[Toxic effects of HSV-TK and CD-TK suicidal gene systems on prostate carcinoma cells]
Dong-Qing Zhang1, Chun-Xiao Xu, Zhi-Shun Xu
1Department of Urology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, PR China. zhang68dq@163.com
Background & Objective:
Suicidal gene therapy is one of promising gene therapies. In order to assess the value of suicidal gene therapy on human prostate carcinoma, the authors studied the toxic effects of HSV-TK gene and CD-TK fusion gene systems on prostate carcinoma cell line PC-3m.
Methods:
HSV-TK gene and CD-TK fusion gene were separately transfected into PC-3m cells through retrovirus vectors. Reverse transcription-polymerase chain reaction (RT-PCR) was used to demonstrate successful transfection and transcription of suicidal genes. The toxic effects of GCV, 5-FC, and both of them on transfected PC-3m cells were explored by MTT assay; non-transfected PC-3m cells were used as control.
Results:
Significantly cytotoxic activity of GCV was observed and 50% inhibitory concentration(IC(50)) was 8.34 microg/ml,the bystander effect of GCV was modest,while the bystander effect of 5-Fc was significant,it began to show when the percent of tansfected PC-3m cells in mixed cells was 5%. Simultaneous treatment with two prodrugs on CD-TK expressing cells resulted in additive or synergistic toxicity,coefficient of drug interaction(CDI) was under 1.
Conclusion:
CD-TK fusion suicidal gene system has significant toxic effect on PC-3m cells in vitro, which was superior to HSV-TK alone gene system.
Insights
The CD-TK fusion gene system shows significant toxicity against prostate cancer cells (PC-3m), outperforming the HSV-TK gene system in vitro. This suicidal gene therapy approach offers a promising strategy for prostate carcinoma treatment.
Area of Science:
- Oncology
- Gene Therapy
- Molecular Biology
Context:
- Suicide gene therapy is an emerging modality for cancer treatment.
- Prostate carcinoma is a significant health concern globally.
- The PC-3m cell line is a relevant model for studying prostate cancer.
- Evaluating novel gene constructs for enhanced therapeutic efficacy is crucial.
Purpose:
- To assess the in vitro toxic effects of the HSV-TK gene and CD-TK fusion gene systems on the PC-3m prostate carcinoma cell line.
- To compare the efficacy of these gene systems in combination with prodrugs (GCV, 5-FC).
Summary:
- PC-3m cells were transfected with HSV-TK or CD-TK genes using retrovirus vectors.
- Successful gene expression was confirmed via RT-PCR.
- MTT assays evaluated the cytotoxic effects of GCV and 5-FC, individually and combined.
- The CD-TK system demonstrated superior toxicity compared to HSV-TK.
- Significant bystander effects were observed with 5-FC, and combined prodrug treatment showed synergistic toxicity.
Impact:
- The CD-TK fusion gene system exhibits potent anti-cancer activity against prostate carcinoma cells in vitro.
- This study highlights the potential of CD-TK as a superior suicide gene therapy for prostate cancer.
- Findings support further investigation into CD-TK for clinical applications in prostate cancer treatment.