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Effect of 1918 PB1-F2 Expression on Influenza A Virus Infection Kinetics

Journal Article · · PLoS Computational Biology (Online)
 [1];  [2];  [3];  [4];  [5];  [6];  [5]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Biology and Biophysics; DOE/OSTI
  2. Univ. of Utah, Salt Lake City, UT (United States). Depts. of Mathematics and Biology
  3. Univ. of Melbourne (Australia). Dept. of Immunology and Microbiology
  4. Univ. of Arizona, Tucson, AZ (United States). Dept. of Molecular and Cellular Biology
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Biology and Biophysics
  6. St. Jude Children’s Research Hospital, Memphis, TN (United States). Dept. of Infectious Diseases
Relatively little is known about the viral factors contributing to the lethality of the 1918 pandemic, although its unparalleled virulence was likely due in part to the newly discovered PB1-F2 protein. This protein, while unnecessary for replication, increases apoptosis in monocytes, alters viral polymerase activity in vitro, enhances inflammation and increases secondary pneumonia in vivo. However, the effects the PB1-F2 protein have in vivo remain unclear. To address the mechanisms involved, we intranasally infected groups of mice with either influenza A virus PR8 or a genetically engineered virus that expresses the 1918 PB1-F2 protein on a PR8 background, PR8-PB1-F2(1918). Mice inoculated with PR8 had viral concentrations peaking at 72 hours, while those infected with PR8-PB1-F2(1918) reached peak concentrations earlier, 48 hours. Mice given PR8-PB1-F2(1918) also showed a faster decline in viral loads. We fit a mathematical model to these data to estimate parameter values. The model supports a higher viral production rate per cell and a higher infected cell death rate with the PR8-PB1-F2(1918) virus. We discuss the implications these mechanisms have during an infection with a virus expressing a virulent PB1-F2 on the possibility of a pandemic and on the importance of antiviral treatments.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1627211
Journal Information:
PLoS Computational Biology (Online), Journal Name: PLoS Computational Biology (Online) Journal Issue: 2 Vol. 7; ISSN 1553-7358
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Moving H5N1 studies into the era of systems biology journal December 2013
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Hierarchical effects of pro-inflammatory cytokines on the post-influenza susceptibility to pneumococcal coinfection journal November 2016
Understanding the within-host dynamics of influenza A virus: from theory to clinical implications journal June 2016
Specific mutations in H5N1 mainly impact the magnitude and velocity of the host response in mice journal January 2013
A comprehensive map of the influenza A virus replication cycle journal October 2013
Reducing Uncertainty in Within-Host Parameter Estimates of Influenza Infection by Measuring Both Infectious and Total Viral Load journal May 2013
Modeling the Dynamics and Migratory Pathways of Virus-Specific Antibody-Secreting Cell Populations in Primary Influenza Infection journal August 2014
Non-Avian Animal Reservoirs Present a Source of Influenza A PB1-F2 Proteins with Novel Virulence-Enhancing Markers journal November 2014
Analysis of Practical Identifiability of a Viral Infection Model journal December 2016
Kinetics of Coinfection with Influenza A Virus and Streptococcus pneumoniae journal March 2013
Modeling Influenza Virus Infection: A Roadmap for Influenza Research journal October 2015
Secondary Bacterial Infections in Influenza Virus Infection Pathogenesis book January 2014
Time and dose-dependent risk of pneumococcal pneumonia following influenza: a model for within-host interaction between influenza and Streptococcus pneumoniae journal September 2013
How sticky should a virus be? The impact of virus binding and release on transmission fitness using influenza as an example journal March 2014
Estimating biologically relevant parameters under uncertainty for experimental within-host murine West Nile virus infection journal April 2016
Host-pathogen kinetics during influenza infection and coinfection: insights from predictive modeling journal August 2018
The amazing innate immune response to influenza A virus infection journal November 2013
Influenza Virus Infection Model With Density Dependence Supports Biphasic Viral Decay journal July 2018

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