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Quantum Dots-siRNA Nanoplexes for Gene Silencing in Central Nervous System Tumor Cells
Guimiao Lin1, Ting Chen1,2, Jinyun Zou1,2
1Department of Physiology, School of Basic Medical Sciences, Shenzhen University Health Sciences CenterShenzhen, China.
Abstract:
RNA interfering (RNAi) using short interfering RNA (siRNA) is becoming a promising approach for cancer gene therapy. However, owing to the lack of safe and efficient carriers, the application of RNAi for clinical use is still very limited. In this study, we have developed cadmium sulphoselenide/Zinc sulfide quantum dots (CdSSe/ZnS QDs)-based nanocarriers for in vitro gene delivery. These CdSSe/ZnS QDs are functionalized with polyethyleneimine (PEI) to form stable nanoplex (QD-PEI) and subsequently they are used for siRNA loading which specially targets human telomerase reverse transcriptase (TERT). High gene transfection efficiency (>80%) was achieved on two glioblastoma cell lines, U87 and U251. The gene expression level (49.99 ± 10.23% for U87, 43.28 ± 9.66% for U251) and protein expression level (51.58 ± 7.88% for U87, 50.69 ± 7.59% for U251) of TERT is observed to decrease substantially after transfecting the tumor cells for 48 h. More importantly, the silencing of TERT gene expression significantly suppressed the proliferation of glioblastoma cells. No obvious cytotoxicity from these QD-PEI nanoplexes were observed over at 10 times of the transfected doses. Based on these results, we envision that QDs engineered here can be used as a safe and efficient gene nanocarrier for siRNA delivery and a promising tool for future cancer gene therapy applications.
Insights
Quantum dots (QDs) functionalized with polyethyleneimine (PEI) efficiently deliver short interfering RNA (siRNA) to glioblastoma cells, significantly reducing human telomerase reverse transcriptase (TERT) and suppressing tumor proliferation without toxicity.
Area of Science:
- Biotechnology
- Nanomedicine
- Cancer Gene Therapy
Background:
- RNA interfering (RNAi) holds promise for cancer gene therapy but is limited by inefficient and unsafe delivery carriers.
- Developing effective nanocarriers is crucial for advancing RNAi-based cancer treatments.
Purpose of the Study:
- To develop novel cadmium sulphoselenide/Zinc sulfide quantum dots (CdSSe/ZnS QDs)-based nanocarriers for in vitro gene delivery.
- To evaluate the efficacy of these nanocarriers in delivering short interfering RNA (siRNA) targeting human telomerase reverse transcriptase (TERT) in glioblastoma cells.
Main Methods:
- CdSSe/ZnS QDs were functionalized with polyethyleneimine (PEI) to create QD-PEI nanoplexes.
- These nanoplexes were loaded with siRNA targeting TERT and used for transfection in U87 and U251 glioblastoma cell lines.
- Gene and protein expression levels of TERT, cell proliferation, and cytotoxicity were assessed.
Main Results:
- High gene transfection efficiency (>80%) was achieved in both glioblastoma cell lines.
- Significant reduction in TERT gene (49.99% in U87, 43.28% in U251) and protein (51.58% in U87, 50.69% in U251) expression was observed after 48 hours.
- TERT gene silencing effectively suppressed glioblastoma cell proliferation with no significant cytotoxicity observed.
Conclusions:
- Engineered QD-PEI nanocarriers provide a safe and efficient platform for siRNA delivery.
- These nanocarriers show significant potential as a tool for future glioblastoma gene therapy by targeting TERT.
- The developed quantum dot nanocarriers represent a promising advancement in RNAi-based cancer treatment strategies.
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