| Autor: |
Widge, Alicia T., Hofstetter, Amelia R., Houser, Katherine V., Awan, Seemal F., Chen, Grace L., Burgos Florez, Maria C., Berkowitz, Nina M., Mendoza, Floreliz, Hendel, Cynthia S., Holman, LaSonji A., Gordon, Ingelise J., Apte, Preeti, Liang, C. Jason, Gaudinski, Martin R., Coates, Emily E., Strom, Larisa, Wycuff, Diane, Vazquez, Sandra, Stein, Judy A., Gall, Jason G. |
| Předmět: |
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| Zdroj: |
Science Translational Medicine; 4/19/2023, Vol. 15 Issue 692, p1-11, 11p |
| Abstrakt: |
Influenza vaccines could be improved by platforms inducing cross-reactive immunity. Immunodominance of the influenza hemagglutinin (HA) head in currently licensed vaccines impedes induction of cross-reactive neutralizing stem-directed antibodies. A vaccine without the variable HA head domain has the potential to focus the immune response on the conserved HA stem. This first-in-human dose-escalation open-label phase 1 clinical trial (NCT03814720) tested an HA stabilized stem ferritin nanoparticle vaccine (H1ssF) based on the H1 HA stem of A/New Caledonia/20/1999. Fifty-two healthy adults aged 18 to 70 years old enrolled to receive either 20 μg of H1ssF once (n = 5) or 60 μg of H1ssF twice (n = 47) with a prime-boost interval of 16 weeks. Thirty-five (74%) 60-μg dose participants received the boost, whereas 11 (23%) boost vaccinations were missed because of public health restrictions in the early stages of the COVID-19 pandemic. The primary objective of this trial was to evaluate the safety and tolerability of H1ssF, and the secondary objective was to evaluate antibody responses after vaccination. H1ssF was safe and well tolerated, with mild solicited local and systemic reactogenicity. The most common symptoms included pain or tenderness at the injection site (n = 10, 19%), headache (n = 10, 19%), and malaise (n = 6, 12%). We found that H1ssF elicited cross-reactive neutralizing antibodies against the conserved HA stem of group 1 influenza viruses, despite previous H1 subtype head-specific immunity. These responses were durable, with neutralizing antibodies observed more than 1 year after vaccination. Our results support this platform as a step forward in the development of a universal influenza vaccine. Fighting flu: A major goal for influenza vaccines is to elicit broadly reactive immune responses that can protect against many strains of the virus. Widge et al. and Andrews et al. report results of a phase 1 clinical trial testing a vaccine that may get closer to this goal. Widge et al. demonstrated that immunization with one or two doses of an H1 hemagglutinin stabilized stem nanoparticle (H1ssF) vaccine was safe in recipients and elicited durable neutralizing antibody responses. Andrews et al. found that memory B cell responses elicited by H1ssF vaccination were broadly cross-reactive and targeted two conserved epitopes on the H1 stem. Together, these studies highlight the potential of H1ssF and similar stem-only immunogens as influenza vaccines. —CM [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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