Abstract
Introduction
Overexpression studies have been commonly used to yield significant advances in cell biology. In vitro osteoclast culturing involves the differentiation of bone marrow-derived monocyte macrophage precursors (BMMs) in medium supplemented with macrophage colony-stimulating factor and receptor activator of nuclear factor-kB ligand (RANKL) into mature osteoclasts. Retroviral vectors are the gold standards for efficient gene delivery into BMMs. While this strategy is effective in BMMs that are in the early stages of differentiation, it is ineffective in RANKL-treated BMMs such as mono- and multinucleated osteoclasts. This study attempted to enhance gene delivery into differentiated BMMs using liposome-mediated RNA transfection.
Material and methods
BMMs were transfected with an EYFP overexpression plasmid or EYFP RNA by lipofection, or transduced with a retroviral vector expressing EYFP. EYFP expression was assessed by flow cytometry.
Results
We performed overexpression analyses using enhanced yellow fluorescent protein (EYFP). Although EYFP expression was observed 24 h after infection of BMMs with a recombinant retrovirus containing EYFP, expression of EYFP was observed within 3 h of transfection with EYFP RNA. Moreover, the efficiency of EYFP RNA for gene delivery into BMMs was comparable to that of retroviral transduction of EYFP. In contrast, while very few BMMs stimulated by RANKL for two days expressed EYFP after retroviral infection, more than half of the cells expressed EYFP after transfection with EYFP RNA.
Conclusion
RNA-mediated gene delivery is quick and easy method for performing gain-of-function analyses in primary osteoclast precursors and mature osteoclasts.
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Acknowledgments
This work was supported by Grants-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science (JSPS) (18H02614 to K. N.); and grants from the Takeda Science Foundation (to K.N.); and the Food Science Institute Foundation (Ryoushoku-kenkyukai to K. N.); and Suzuken Memorial Foundation (to K. N.); and Terumo Life Science Foundation (to K. N.); and Fuji Foundation For Protein Research (to K. N.); and The Tojuro Iijima Foundation for Food Science and Technology (to K. N.); and Nakatani Foundation (to K. N.).
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Animal study was approved by the Institutional Animal Care and Use Committee of both Doshisha University and Osaka University.
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Nishikawa, K., Ishii, M. Novel method for gain-of-function analyses in primary osteoclasts using a non-viral gene delivery system. J Bone Miner Metab 39, 353–359 (2021). https://doi.org/10.1007/s00774-020-01161-7
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DOI: https://doi.org/10.1007/s00774-020-01161-7