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Monitoring HSV-TK/ganciclovir cancer suicide gene therapy using CdTe/CdS core/shell quantum dots
Dan Shao1, Qinghui Zeng, Zheng Fan
1Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun 130021, China.
Abstract:
To be able to label a gene and monitor its migration are key important approaches for the clinical application of cancer suicide gene therapy. Photonic nanomaterials are introduced in this work. One of the most promised suicide genes - herpes simplex virus thymidine kinase (HSV-TK) gene - is successfully linked with CdTe/CdS core/shell quantum dots (QDs) via EDC/NHS coupling method. From confocal microscopy it was demonstrated that plasmid TK intracellular trafficking can be effectively and distinctly traced via monitoring the luminescence of the QDs up to 96 h after transfection of QDs-TK conjugates into Hela cells. MTT results show that the QDs-TK conjugates have a high efficient cytotoxicity after adding GCV into Hela cells, whereas the QDs exert no detectable deleterious effects on the cellular processes. The apoptosis induced by QDs-TK conjugates with GCV is distinctly traced partly due to the strong luminescence of the QDs. Our results indicate that photonic nanomaterials, e.g. QDs, provide a tool for monitoring TK gene delivery and anti-cancer activity.
Insights
Quantum dots (QDs) successfully labeled the herpes simplex virus thymidine kinase (HSV-TK) gene for tracking cancer gene therapy. This QD-TK conjugate showed high cytotoxicity in Hela cells when treated with GCV, enabling effective monitoring of gene delivery and anti-cancer activity.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Molecular Biology
Background:
- Monitoring gene delivery is crucial for cancer suicide gene therapy's clinical success.
- Photonic nanomaterials offer novel tools for biological applications.
- The herpes simplex virus thymidine kinase (HSV-TK) gene is a promising candidate for cancer suicide gene therapy.
Purpose of the Study:
- To develop a method for labeling and monitoring the intracellular trafficking of the HSV-TK gene using quantum dots (QDs).
- To evaluate the efficacy and safety of QD-conjugated HSV-TK gene therapy in Hela cells.
- To demonstrate the utility of QDs as a tool for tracking gene delivery and therapeutic response in cancer therapy.
Main Methods:
- Conjugation of CdTe/CdS core/shell QDs with the HSV-TK gene using EDC/NHS coupling.
- Transfection of QDs-TK conjugates into Hela cells.
- Confocal microscopy to monitor intracellular trafficking and luminescence of QDs.
- MTT assays to assess cytotoxicity after Ganciclovir (GCV) treatment.
- Apoptosis assays to evaluate treatment-induced cell death.
Main Results:
- Successful labeling and distinct tracing of plasmid TK intracellular trafficking up to 96 hours post-transfection via QD luminescence.
- QDs-TK conjugates demonstrated high cytotoxicity in Hela cells upon GCV addition.
- QDs alone showed no significant deleterious effects on cellular processes.
- Apoptosis induction was effectively monitored through QD luminescence.
Conclusions:
- Photonic nanomaterials, specifically QDs, provide an effective tool for monitoring TK gene delivery and intracellular trafficking.
- QD-TK conjugates show promise for cancer suicide gene therapy, enabling simultaneous monitoring of gene delivery and therapeutic efficacy.
- This approach facilitates the clinical application of gene therapy by offering a traceable and effective method for monitoring gene migration and anti-cancer activity.
