Intranasal influenza vaccine enhances immune response and affords broad safety — ScienceDaily

by akoloy

An influenza vaccine that’s made from nanoparticles and administered via the nostril enhances the physique’s immune response to influenza virus an infection and affords broad safety towards totally different viral strains, in accordance with researchers within the Institute for Biomedical Sciences at Georgia State University.

Recurring seasonal flu epidemics and potential pandemics are among the many most extreme threats to public well being. Current seasonal influenza vaccines induce strain-specific immunity and are much less efficient towards mismatched strains. Broadly protecting influenza vaccines are urgently wanted.

Intranasal vaccines are a promising technique for combatting infectious respiratory ailments, akin to influenza. They are simpler than vaccines injected right into a muscle as a result of they’ll induce mucosal immune responses in respiratory tracts, stopping an infection on the portal of virus entry. They also can stimulate systemic immune responses all through the physique.

Scientists can overcome vaccine security issues and the lengthy manufacturing section of virus-based influenza vaccines by establishing intranasal vaccines with recombinant proteins or peptides. However, these vaccines are poor at producing immune responses, so it’s a necessity to have potent mucosal adjuvants, substances that improve the physique’s immune response to antigens (the molecular buildings on pathogens). The absence of acceptable mucosal adjuvants presently hinders the event of such a vaccine.

In this research, the researchers developed an intranasal influenza vaccine utilizing recombinant hemagglutinin (HA), a protein discovered on the floor of influenza viruses, because the antigen element of the vaccine. HA is integral to the flexibility of influenza virus to trigger an infection.

They additionally created a two-dimensional nanomaterial (polyethyleneimine-functionalized graphene oxide nanoparticles) and located that it displayed potent adjuvant (immunoenhancing) results on influenza vaccines delivered intranasally. The findings are printed within the journal Proceedings of the National Academy of Sciences.

“Conventional flu vaccines predominantly induce antibody responses,” mentioned Dr. Baozhong Wang, senior writer of the research, principal investigator of the National Institutes of Health grant supporting the research and a professor within the Institute for Biomedical Sciences. “However, recent research demonstrates that lung resident memory T cell responses are indispensable for optimal cross-protection against pulmonary influenza infection. The development of lung resident T cell responses requires vaccination by a respiratory route or influenza virus infection. Our research opens a new path for the development of needle-free and logistically simplified intranasal flu vaccines for cross-protection.”

“In our study, we reported for the first time that two-dimensional graphene oxide nanomaterials had a potent adjuvant effect in boosting the immune responses of intranasal hemagglutinin (HA) vaccines,” mentioned Dr. Chunhong Dong, lead writer of the research and a postdoctoral analysis Fellow in Dr. Baozhong Wang’s lab within the Institute for Biomedical Sciences.

“This study gives new insights into developing high performance intranasal vaccine systems with two-dimensional sheet-like nanoparticles,” Dong mentioned. “The graphene oxide nanoparticles have extraordinary attributes for drug delivery or vaccine development, such as the ultra-large surface area for high-density antigen loading, and the vaccine showed superior immunoenhancing properties in vitro and in vivo. The nanoplatform could be easily adapted for constructing mucosal vaccines for different respiratory pathogens.”

The research, performed in mice and cell tradition, discovered the nanoparticles considerably enhanced immune responses at mucosal surfaces and all through the physique in mice. The sturdy immune responses conferred immune safety towards influenza virus challenges by homologous (identical) virus strains and heterologous (totally different) virus strains.

The outcomes are additionally promising as a result of needle-free, intranasal influenza vaccines possess superior logistical benefits over conventional injectable vaccines, akin to straightforward administration with excessive acceptance for recipients and the avoidance of biohazardous waste.

Co-authors of the research embody Dr. Chunhong Dong, Ye Wang, Gilbert Gonzalez, Yao Ma, Yufeng Song, Dr. Sang-Moo Kang and Dr. Baozhong Wang of the Institute for Biomedical Sciences at Georgia State and Shelly Wang and Dr. Richard W. Compans of Emory University School of Medicine.

The research was funded by the National Institutes of Health’s National Institute of Allergy and Infectious Diseases.

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