Canadians Show Papaya Mosaic Virus Creates Lung Immunity From Influenzas.


Canadian scientists have turned what the papaya industry producers have considered a “plague”, papaya mosaic virus (PAPmv) into a potential vaccine to protect against new influenza or bioterrorism…

Induction of innate immunity in lungs with virus-like nanoparticles leads to protection against influenza and Streptococcus pneumoniae challenge.

AuthorsMathieu C, et al. Show all Journal
Nanomedicine. 2013 Mar 8. pii: S1549-9634(13)00075-0. doi: 10.1016/j.nano.2013.02.009. [Epub ahead of print]

Department of Microbiology, Infectiology and Immunology, Infectious Disease Research Centre/CHU de Qu├ębec, Laval University, Laurier, Quebec City, PQ, Canada.

Nanoparticles composed of the coat protein of a plant virus (papaya mosaic virus; PapMV) and a single-stranded RNA (ssRNA) trigger a strong innate immune stimulation in the lungs of the animals a few hours following instillation. A rapid recruitment of neutrophils, monocytes/macrophages and lymphocytes follows. This treatment was able to provide protection to an influenza challenge that lasts at least 5days. Protection could be recalled for longer periods by repeating the instillations once per week for more than 10weeks. The treatment also conferred protection to a lethal challenge with Streptococcus pneumoniae – the major cause of bacterial pneumonia. Finally, we also showed that the nanoparticles could be used to treat mice infected with influenza and significantly decrease morbidity. These data strengthen the potential for using PapMV nanoparticles as non-specific inducers of the innate immune response in lungs during viral pandemics or to combat bioterrorist attack.