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Vaccination mitigates influenza-induced muscular declines in aged mice

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Abstract

Influenza (flu) infection increases the risk for disability, falls, and broken bones in older adults. We have employed a preclinical model to examine the impact of flu on muscle function, which has a direct impact on fall risk. In mice, flu causes mobility and strength impairments with induction of inflammatory and muscle degradation genes that are increased and prolonged with aging. To determine if vaccination could reduce flu-induced muscle decrements, mice were vaccinated with flu nucleoprotein, infected, and muscle parameters were measured. Vaccination of aged mice resulted in significant protection from functional decrements, muscle gene expressions alterations, and morphological damage. Vaccination also improved protection from lung localized and systemic inflammation in aged mice. Despite documented decreased vaccine efficacy with aging, vaccination still provided partial protection to aged mice and represents a potential strategy to prevent flu-induced disability. These findings provide translational insight on ways to reduce flu-induced disability with aging.

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Acknowledgments

This research was partially conducted while Jenna Bartley was a Glenn/AFAR Postdoctoral Fellow. The primary monoclonal antibodies for myosin heavy chain type I (BA-D5), IIA (SC-71), and IIB (BF-F3), developed by S. Schiaffino at the University of Padova, was obtained from the Developmental Studies Hybridoma Bank, created by the NICHD of the NIH, and maintained at The University of Iowa, Department of Biology, Iowa City, IA 52242. The authors would like to thank Sandra Jastrzebski and Darcy Ahern for their assistance with experimental assays and manuscript preparation.

Funding

This work was supported by the National Institutes of Health/National Institute on Aging grants AG021600 and AG060389 (to L.H.)

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Authors and Affiliations

Authors

Contributions

SRK, ECL, JMB, and LH conceived and designed the experiments. SRK, ECL, AGH, and BLT carried out experiments. SRK and ECL analyzed data. SRK led data interpretation and manuscript preparation. JMB and LH supervised the project and assisted with data interpretation and acquisition of funding. All authors discussed the results and contributed to the final manuscript.

Corresponding author

Correspondence to Laura Haynes.

Ethics declarations

All mice were cared for in accordance with the recommendations in the Guide for the Care and use of Laboratory Animals of the National Institutes of Health. All procedures were approved by the University of Connecticut Medical School IACUC, protocol number 100705.

Conflict of interest

The authors declare that they have no conflict of interest.

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Electronic supplementary material

Online Resource 1

Experimental plan for the experiments described. The timeline for our experiments depicting when mice were vaccinated, infected, and sacrificed. Figure made with biorender.com (PNG 439 kb)

Online Resource 2

Vaccination to influenza reduced flu-induced functional decrements in voluntary locomotor activity, grip strength, and gait kinematics. Young and aged C57BL/6 mice were vaccinated with NP/Alum or PBS before being intranasally infected with 500 EID50 of PR8 influenza. Mice were acclimated to testing prior to infection and tested for functional performance at designated time points. A-G) Gait parameters were assessed utilizing DigiGait, a ventral plane videography treadmill system 7 days post infection (n = 8–15). G) Spontaneous voluntary activity was assessed via the open field test at 8 days post infection (n = 10–15/group). I) Grip strength was determined by using a grip strength meter at day 8 post infection (n = 10–15/group). Data analyzed via two-way ANOVA with Bonferroni post hoc corrections comparing to NoVax/NoFlu age-matched controls (* = p < 0.05), comparing to NoVax/Flu age-matched controls (# = p < 0.05), and comparing between ages within a condition (brackets = p < 0.05) (PNG 141 kb)

Online Resource 3

Vaccination preserves architecture and nuclear infiltration of young and aged skeletal muscle H&E’s. A) The H&E’s are representative for each group at each time point analyzed. Scale bars are 100 μm. B) Blindly scored H&E summaries across each timepoint (n = 3–5). C) Muscle cross-sectional area via immunofluorescent staining from uninfected (left), unvaccinated/infected (middle), and vaccinated/infected (right) 9 DPI young mice. Colors: ‘myosin heavy chain I (red), myosin heavy chain IIA (green), myosin heavy chain IIB (yellow), myosin heavy chain IIX (no stain), nuclei (cyan). Scale bars are 100 μm. Data analyzed via two-way ANOVA with Bonferroni post hoc corrections comparing to NoVax/NoFlu age-matched controls (* = p < 0.05), comparing to NoVax/Flu age-matched controls (# = p < 0.05) (PNG 945 kb)

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Keilich, S.R., Lorenzo, E.C., Torrance, B.L. et al. Vaccination mitigates influenza-induced muscular declines in aged mice. GeroScience 42, 1593–1608 (2020). https://doi.org/10.1007/s11357-020-00206-z

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  • DOI: https://doi.org/10.1007/s11357-020-00206-z

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