Abstract
Dengue is an arthropod-borne viral infection mainly vectored through the bite of Aedes mosquitoes. Recently, its transmission has strongly increased in urban and semi-urban areas of tropical and sub-tropical regions worldwide, becoming a major international public health concern. There is no specific treatment for dengue. Its prevention and control solely depends on effective vector control measures. In this study, we proposed the green-synthesis of silver nanoparticles (AgNP) as a novel and effective tool against the dengue serotype DEN-2 and its major vector Aedes aegypti. AgNP were synthesized using the Moringa oleifera seed extract as reducing and stabilizing agent. AgNP were characterized using a variety of biophysical methods including UV–vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and sorted for size categories. AgNP showed in vitro antiviral activity against DEN-2 infecting vero cells. Viral titer was 7 log10 TCID50/ml in control (AgNP-free), while it dropped to 3.2 log10 TCID50/ml after a single treatment with 20 μl/ml of AgNP. After 6 h, DEN-2 yield was 5.8 log10 PFU/ml in the control, while it was 1.4 log10 PFU/ml post-treatment with AgNP (20 μl/ml). AgNP were highly effective against the dengue vector A. aegypti, with LC50 values ranging from 10.24 ppm (I instar larvae) to 21.17 ppm (pupae). Overall, this research highlighted the concrete potential of green-synthesized AgNP in the fight against dengue and its primary vector A. aegypti. Further research on structure–activity relationships of AgNP against other dengue serotypes is urgently required.
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Acknowledgments
We are grateful to Prof. Heinz Mehlhorn and the anonymous reviewers for improving an earlier version of the manuscript. We would like to thank the Deanship of Scientific Research at King Saud University for its financial support (project no. RGP-1435-057). Dr. Jayapal Subramaniam is supported by the University Grant Commission of New Delhi (UGC-BSR-RFSMS-Research Fellowship in Science for Meritorious Students). We also thank the Research and Development Centre of Bharathiar University for providing instrumentation facilities.
Conflicts of interest
The authors declare no conflicts of interest. Dr. Giovanni Benelli is currently an Editorial Board Member of Parasitology Research, but this does not alter the authors’ adherence to all the Parasitology Research policies on sharing data and materials.
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All applicable international and national guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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Informed consent was obtained from all individual participants included in the study.
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Sujitha, V., Murugan, K., Paulpandi, M. et al. Green-synthesized silver nanoparticles as a novel control tool against dengue virus (DEN-2) and its primary vector Aedes aegypti . Parasitol Res 114, 3315–3325 (2015). https://doi.org/10.1007/s00436-015-4556-2
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DOI: https://doi.org/10.1007/s00436-015-4556-2