Abstract
Gold nanoparticles are widely used for biomedical applications owing to their biocompatibility, ease of functionalization and relatively non-toxic nature. In recent years, biogenic nanoparticles have gained attention as an eco-friendly alternative for a variety of applications. In this report, we have synthesized and characterized gold nanoparticles (AuNPs) from an Actinomycete, Nocardiopsis dassonvillei NCIM 5124. The conditions for biosynthesis were optimized (100 mg/ml of cell biomass, 2.5 mM tetrachloroauric acid (HAuCl4) at 80 °C and incubation time of 25 min) and the nanoparticles were characterized by TEM, SAED, EDS and XRD analysis. The nanoparticles were spherical and ranged in size from 10 to 25 nm. Their interactions with human gingival tissue–derived mesenchymal stem cells (GMSCs) and their potential applications in regenerative medicine were evaluated further. The AuNPs did not display cytotoxicity towards GMSCs when assessed by 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide assay, DNA fragmentation patterns and Annexin V/propidium iodide staining techniques. These AuNPs induced faster cell migration when monitored by the in vitro wound healing assay. The effect of these nanoparticles on osteogenesis of GMSCs was also studied. Based on the results obtained from alkaline phosphatase, Von Kossa staining and Alizarin Red S staining, the AuNPs were seen to positively affect differentiation of GMSCs and enhance mineralization of the synthesized matrix. We therefore conclude that the biogenic, non-toxic AuNPs are of potential relevance for tissue regeneration applications.
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Acknowledgements
This work was financially supported by funds from University Grants Commission under University with Potential for Excellence, Phase II. TB thanks the Council of Scientific and Industrial Research, New Delhi, India, for Junior and Senior Research Fellowship. GB thanks the Department of Science and Technology INSPIRE, Govt. of India [grant number IFA13 LSBM73] for fellowship and research grant.
Funding
This work was financially supported by funds from the University Grants Commission under University with Potential for Excellence, Phase II. TB received Junior and Senior Research Fellowship from the Council of Scientific and Industrial Research, New Delhi, India. GB received fellowship and research grant from the Department of Science and Technology INSPIRE, Govt. of India [grant number IFA13 LSBM73].
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Tahsin Bennur. Geetanjali B. Tomar contributed towards cell culture experimentation. Vaishali Javdekar and Smita Zinjarde gave inputs for the nanotechnology component. First manuscript draft was written by Tahsin Bennur. GB and SZ worked on the draft and finalized the contents of the manuscript.
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All protocols involving gingival stem cells have been approved by the Institutional Ethics Committee of Deenanath Mangeshkar Hospital and Research Centre, Pune, India, and Savitribai Phule Pune University, Pune, India. The gingival tissue samples were collected after obtaining informed consent from the donors.
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Bennur, T., Javdekar, V., Tomar, G.B. et al. Gold nanoparticles biosynthesized by Nocardiopsis dassonvillei NCIM 5124 enhance osteogenesis in gingival mesenchymal stem cells. Appl Microbiol Biotechnol 104, 4081–4092 (2020). https://doi.org/10.1007/s00253-020-10508-z
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DOI: https://doi.org/10.1007/s00253-020-10508-z