Abstract
Purpose
Virus-like particles (VLPs) have been used as drug carriers for drug delivery systems. In this study, hCC49 single chain fragment variable (scFv)-displaying Rous sarcoma virus-like particles (RSV VLPs) were produced in silkworm larvae to be a specific carrier of an anti-cancer drug.
Method
RSV VLPs displaying hCC49 scFv were created by the fusion of the transmembrane and cytoplasmic domains of hemagglutinin from influenza A (H1N1) virus and produced in silkworm larvae. The display of hCC49 scFv on the surface of RSV VLPs was confirmed by enzyme-linked immunosorbent assay using tumor-associated glycoprotein-72 (TAG-72), fluorescent microscopy, and immunoelectron microscopy. Fluorescein isothiocyanate (FITC) or doxorubicin (DOX) was incorporated into hCC49 scFv-displaying RSV VLPs by electroporation and specific targeting of these VLPs was investigated by fluorescent microscopy and cytotoxicity assay using LS174T cells.
Results
FITC was delivered to LS174T human colon adenocarcinoma cells by hCC49 scFv-displaying RSV VLPs, but not by RSV VLPs. This indicated that hCC49 scFv allowed FITC-loaded RSV VLPs to be delivered to LS174T cells. DOX, which is an anti-cancer drug with intrinsic red fluorescence, was also loaded into hCC49 scFv-displaying RSV VLPs by electroporation; the DOX-loaded hCC49 scFv-displaying RSV VLPs killed LS174T cells via the specific delivery of DOX that was mediated by hCC49 scFv. HEK293 cells were alive even though in the presence of DOX-loaded hCC49 scFv-displaying RSV VLPs.
Conclusion
These results showed that hCC49 scFv-displaying RSV VLPs from silkworm larvae offered specific drug delivery to colon carcinoma cells in vitro. This scFv-displaying enveloped VLP system could be applied to drug and gene delivery to other target cells.
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Abbreviations
- CLSM:
-
Confocal laser scanning microscope
- BmNPV:
-
Bombyx mori nucleopolyhedrovirus
- BmNPV/RSV-gag-577:
-
BmNPV bacmid encoding the RSV gag protein gene
- BSA:
-
Bovine serum albumin
- DOX:
-
Doxorubicin
- DLS:
-
Dynamic light scattering
- ELISA:
-
Enzyme-linked immunosorbent assay
- FITC:
-
Fluorescein isothiocyanate
- gag:
-
Group antigen protein
- GPI:
-
Glycosylphosphatidylinositol
- HA:
-
Hemagglutinin
- hCC49:
-
Humanized CC49 antibody
- HRP:
-
Horseradish peroxidase
- MTT:
-
3-(4,5-di-methylthiazol-2-2yl)-2,5-diphenyltetrazolium bromide
- PBS:
-
Phosphate-buffered saline
- RSV:
-
Rous sarcoma virus
- RSV VLPs:
-
Rous sarcoma virus-like particles
- scFv:
-
Single-chain variable fragment
- TAG-72:
-
Tumor associated glycoparticle-72
- VLPs:
-
Virus-like particles
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ACKNOWLEDGMENTS AND DISCLOSURES
We thank Professor Hiroshi Ueda (Tokyo Institute of Technology, Japan) for the contribution of the plasmid carrying scFv cDNA. This work was supported by Grant-in-Aid for Scientific Research (A) Grant No.22248009 and by Promotion of Nanobio-Technology Research to Support Aging and Welfare Society from the Ministry of Education, Culture, Sports, Science and Technology, Japan. No additional external funding was received for this study.
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Kato, T., Yui, M., Deo, V.K. et al. Development of Rous sarcoma Virus-like Particles Displaying hCC49 scFv for Specific Targeted Drug Delivery to Human Colon Carcinoma Cells. Pharm Res 32, 3699–3707 (2015). https://doi.org/10.1007/s11095-015-1730-2
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DOI: https://doi.org/10.1007/s11095-015-1730-2