Advanced search
1 file | 1.93 MB

Increased protein degradation improves influenza virus nucleoprotein-specific CD8⁺ T cell activation in vitro but not in C57BL/6 mice

(2016) JOURNAL OF VIROLOGY. 90(22). p.10209-10219
Author
Organization
Abstract
Due to antigenic drift of influenza viruses, seasonal influenza vaccines need to be updated annually. These vaccines are based on predictions of strains likely to circulate in the next season. However, vaccine efficacy is greatly reduced in the case of a mismatch between circulating and vaccine strains. Furthermore, novel antigenically distinct influenza viruses are introduced into the human population from animal reservoirs occasionally and may cause pandemic outbreaks. To dampen the impact of seasonal and pandemic influenza, vaccines that induce broadly protective and long-lasting immunity are preferred. Because influenza virusspecific CD8(+) T cells are directed mainly against relatively conserved internal proteins, like nucleoprotein (NP), they are highly cross-reactive and afford protection against infection with antigenically distinct influenza virus strains, so-called heterosubtypic immunity. Here, we used modified vaccinia virus Ankara (MVA) as a vaccine vector for the induction of influenza virus NP-specific CD8(+) T cells. To optimize the induction of CD8(+) T cell responses, we made several modifications to NP, aiming at retaining the protein in the cytosol or targeting it to the proteasome. We hypothesized that these strategies would increase antigen processing and presentation and thus improve the induction of CD8 (+) T cell responses. We showed that NP with increased degradation rates improved CD8(+) T cell activation in vitro if the amount of antigen was limited or if CD8 (+) T cells were of low functional avidity. However, after immunization of C57BL/6 mice, no differences were detected between modified NP and wild-type NP (NPwt), since NPwt already induced optimal CD8(+) T cell responses. IMPORTANCE : Due to the continuous antigenic drift of seasonal influenza viruses and the threat of a novel pandemic, there is a great need for the development of novel influenza vaccines that offer broadly protective immunity against multiple subtypes. CD8(+) T cells can provide immunity against multiple subtypes of influenza viruses by the recognition of relatively conserved internal antigens. In this study, we aimed at optimizing the CD8(+) T cell response to influenza A virus by making modifications to influenza A virus nucleoprotein (NP) expressed from the modified vaccinia virus Ankara (MVA) vaccine vector. These modifications resulted in increased antigen degradation, thereby producing elevated levels of peptides that can be presented on major histocompatibility complex (MHC) class I molecules to CD8(+) T cells. Although we were unable to increase the NP-specific immune response in the mouse strain used, this approach may have benefits for vaccine development using less-immunogenic proteins.
Keywords
CROSS-PROTECTIVE IMMUNITY, INFECTED-CELLS, ANKARA MVA, A VIRUSES, VACCINE EFFECTIVENESS, ANTIGEN PRESENTATION, DNA IMMUNIZATION, LETHAL INFECTION, JANUARY 2015, RESPONSES

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • binary/octet-stream
    • |
    • 1.93 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Altenburg, Arwen F, Carolien E van de Sandt, Stella E van Trierum, Heidi LM De Gruyter, Peter RWA van Run, Ron AM Fouchier, Kenny Roose, et al. 2016. “Increased Protein Degradation Improves Influenza Virus Nucleoprotein-specific CD8+ T Cell Activation in Vitro but Not in C57BL/6 Mice.” Journal of Virology 90 (22): 10209–10219.
APA
Altenburg, A. F., van de Sandt, C. E., van Trierum, S. E., De Gruyter, H. L., van Run, P. R., Fouchier, R. A., Roose, K., et al. (2016). Increased protein degradation improves influenza virus nucleoprotein-specific CD8+ T cell activation in vitro but not in C57BL/6 mice. JOURNAL OF VIROLOGY, 90(22), 10209–10219.
Vancouver
1.
Altenburg AF, van de Sandt CE, van Trierum SE, De Gruyter HL, van Run PR, Fouchier RA, et al. Increased protein degradation improves influenza virus nucleoprotein-specific CD8+ T cell activation in vitro but not in C57BL/6 mice. JOURNAL OF VIROLOGY. 2016;90(22):10209–19.
MLA
Altenburg, Arwen F, Carolien E van de Sandt, Stella E van Trierum, et al. “Increased Protein Degradation Improves Influenza Virus Nucleoprotein-specific CD8+ T Cell Activation in Vitro but Not in C57BL/6 Mice.” JOURNAL OF VIROLOGY 90.22 (2016): 10209–10219. Print.
@article{8525950,
  abstract     = {Due to antigenic drift of influenza viruses, seasonal influenza vaccines need to be updated annually. These vaccines are based on predictions of strains likely to circulate in the next season. However, vaccine efficacy is greatly reduced in the case of a mismatch between circulating and vaccine strains. Furthermore, novel antigenically distinct influenza viruses are introduced into the human population from animal reservoirs occasionally and may cause pandemic outbreaks. To dampen the impact of seasonal and pandemic influenza, vaccines that induce broadly protective and long-lasting immunity are preferred. Because influenza virusspecific CD8(+) T cells are directed mainly against relatively conserved internal proteins, like nucleoprotein (NP), they are highly cross-reactive and afford protection against infection with antigenically distinct influenza virus strains, so-called heterosubtypic immunity. Here, we used modified vaccinia virus Ankara (MVA) as a vaccine vector for the induction of influenza virus NP-specific CD8(+) T cells. To optimize the induction of CD8(+) T cell responses, we made several modifications to NP, aiming at retaining the protein in the cytosol or targeting it to the proteasome. We hypothesized that these strategies would increase antigen processing and presentation and thus improve the induction of CD8 (+) T cell responses. We showed that NP with increased degradation rates improved CD8(+) T cell activation in vitro if the amount of antigen was limited or if CD8 (+) T cells were of low functional avidity. However, after immunization of C57BL/6 mice, no differences were detected between modified NP and wild-type NP (NPwt), since NPwt already induced optimal CD8(+) T cell responses. 
IMPORTANCE : Due to the continuous antigenic drift of seasonal influenza viruses and the threat of a novel pandemic, there is a great need for the development of novel influenza vaccines that offer broadly protective immunity against multiple subtypes. CD8(+) T cells can provide immunity against multiple subtypes of influenza viruses by the recognition of relatively conserved internal antigens. In this study, we aimed at optimizing the CD8(+) T cell response to influenza A virus by making modifications to influenza A virus nucleoprotein (NP) expressed from the modified vaccinia virus Ankara (MVA) vaccine vector. These modifications resulted in increased antigen degradation, thereby producing elevated levels of peptides that can be presented on major histocompatibility complex (MHC) class I molecules to CD8(+) T cells. Although we were unable to increase the NP-specific immune response in the mouse strain used, this approach may have benefits for vaccine development using less-immunogenic proteins.},
  author       = {Altenburg, Arwen F and van de Sandt, Carolien E and van Trierum, Stella E and De Gruyter, Heidi LM and van Run, Peter RWA and Fouchier, Ron AM and Roose, Kenny and Saelens, Xavier and Volz, Asisa and Sutter, Gerd and de Vries, Rory D and Rimmelzwaan, Guus F},
  isbn         = {1098-5514},
  issn         = {0022-538X},
  journal      = {JOURNAL OF VIROLOGY},
  keywords     = {CROSS-PROTECTIVE IMMUNITY,INFECTED-CELLS,ANKARA MVA,A VIRUSES,VACCINE EFFECTIVENESS,ANTIGEN PRESENTATION,DNA IMMUNIZATION,LETHAL INFECTION,JANUARY 2015,RESPONSES},
  language     = {eng},
  number       = {22},
  pages        = {10209--10219},
  title        = {Increased protein degradation improves influenza virus nucleoprotein-specific CD8⁺ T cell activation in vitro but not in C57BL/6 mice},
  url          = {http://dx.doi.org/10.1128/jvi.01633-16},
  volume       = {90},
  year         = {2016},
}

Altmetric
View in Altmetric
Web of Science
Times cited: