Abstract
We aimed to develop a simple yet novel method to prepare plasmid DNA-loaded nanoliposomes for cancer gene therapy. Murine interleukin-12 (mIL-12) pDNA-loaded nanoliposomes were prepared via novel freeze-drying of a monophase solution method. The physicochemical characteristics, cytotoxicity, and transfection efficiency of the prepared nanoliposomes in murine CT-26 colon carcinoma cells were evaluated. Furthermore, tumor progression and survival rate in CT-26 colon carcinoma-bearing BALB/c mice subsequent to direct intratumoral injections were investigated over a period of 40 days. Using this preparation method, nanoliposomes with particle size of around 300 nm and zeta potential of 96.5 mV were obtained. The transmission electron microscope results showed that the liposomes were nano-sized and almost spherical. The agarose gel retardation assay revealed the pDNA encapsulation in the nanoliposomes. The nanoliposomes with 72.4% encapsulation efficiency and low cell toxicity could significantly improve mIL-12 expression by approximately 25-fold relative to the naked mIL-12 pDNA. There was a significant tumor growth inhibition after repeated injections of mIL-12 pDNA-loaded nanoliposomes. This is the first study on the freeze-drying of a monophase solution method as a simple yet novel technique for the preparation of pDNA-loaded nanoliposomes. Given the ease of preparation method and promising in vitro and in vivo characteristics, this investigation demonstrates advances in pDNA lipid formulation for cancer gene therapy.
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All data generated during the current study are available from the corresponding author on reasonable request.
Abbreviations
- Chol:
-
cholesterol
- DOPE:
-
1, 2-dioleoyl-sn-glycero-3-phosphoethanolamine
- DOTAP:
-
dioleoyl trimethylammonium propane
- FBS:
-
fetal bovine serum
- mIL-12:
-
murine interleukin-12
- MTT:
-
4,5-dimethylthiazol-2-yl)-2,5 -diphenyl tetrazolium bromide
- TEM:
-
transmission electron microscopy
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This work was supported by Drug Applied Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
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Somayeh Hallaj-Nezhadi is the supervisor and writes the paper and analyzes the data. Ali Mohammadi, Sara Shamekhi, Nikoo Majidazar, and Saiedeh Razi Soofiyani did all of the experiments. Behzad Baradaran, Nigel AJ McMillan, Farzaneh Lotfipour, and Azita Dilmaghani participated in the design of some of the experiments and writing the paper.
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The study was approved by Ethics Committee of Tabriz University of Medical Sciences, Tabriz, Iran (IR.TBZMED.VCR.REC.1398.051). The authors have participated in the preparation of the manuscript; they have given their permission to submit this manuscript to your journal.
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Baradaran, B., Mohammadi, A., Shamekhi, S. et al. A novel method for the development of plasmid DNA-loaded nanoliposomes for cancer gene therapy. Drug Deliv. and Transl. Res. 12, 1508–1520 (2022). https://doi.org/10.1007/s13346-021-01034-0
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DOI: https://doi.org/10.1007/s13346-021-01034-0