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Glycyrrhizic Acid-Loaded Poly-ɛ-Caprolactone Nanoparticles Decrease PRRSV Infection in MARC-145 Cells

DOI: 10.4236/ojvm.2023.1312018, PP. 221-236

Keywords: Cytotoxicity, Glycyrrhizic Acid, Cell Morphology, Polymeric Nanoparticles, PRRS Virus

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Porcine reproductive and respiratory syndrome (PRRS) is an economically devastating disease with worldwide distribution caused by Betaarterivirus suid (PRRSV). The virion has great genetic and antigenic variability with a marked increase in virulence. Vaccines tested to date have been of little use in controlling the problems caused by PRRSV, so the present study was conceived to evaluate the antiviral effect of polymeric nanoparticles (PNPs) made with glycyrrhizic acid (GA). Recent work has proven that this nanoparticle system is stable. These nanoparticles have good GA carrying capacity, a size < 250 nm, a spherical morphology, and a wide safety range. The integrity of cell morphology can be maintained for up to 72 h. The antiviral effect of this nanoparticle system was tested in cultures of MARC-145 cells in pre- and coinfection assays with PRRSV to evaluate changes in cell morphology and effects on cell viability. The use of PNPsGA with the real-time quantitative polymerase chain reaction (RT-qPCR) decreased viral infection by 38% in 3 amplification cycles. These results suggest that this system has an antiviral effect against PRRSV under the study conditions established.


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