Broadly neutralizing DNA vaccine with specific mutation alters the antigenicity and sugar-binding activities of

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Generation of Escape Variants of Neutralizing Influenza Virus Monoclonal Antibodies
07:55

Generation of Escape Variants of Neutralizing Influenza Virus Monoclonal Antibodies

Published on: August 29, 2017

Ming-Wei Chen1, Hsin-Yu Liao, Yaoxing Huang

  • 1Institute of Biochemistry and Molecular Biology, National Yang-Ming University, Taipei 112, Taiwan.

Proceedings of the National Academy of Sciences of the United States of America
|February 16, 2011
PubMed

Insights

Developing a new DNA vaccine, pCHA5II, significantly improved cross-neutralization against diverse H5N1 influenza viruses. This enhanced vaccine strategy offers broader protection against rapidly evolving influenza strains.

Area of Science:

  • Virology
  • Immunology
  • Vaccine Development

Background:

  • Influenza virus hemagglutinin's rapid genetic drift challenges vaccine efficacy.
  • Previous consensus hemagglutinin DNA vaccine (pCHA5) showed moderate neutralization against H5N1 clades 2.1 and 2.3.
  • Need for broader protection against divergent H5N1 strains is critical.

Purpose of the Study:

  • To enhance the protective breadth of the CHA5 DNA vaccine against H5N1 influenza viruses.
  • To investigate the impact of specific amino acid mutations and updated consensus sequences on vaccine-induced immunity.
  • To develop a more effective vaccine strategy against rapidly evolving influenza.

Main Methods:

  • Immunization of mice with modified CHA5 DNA vaccines (pCHA5 with mutations, and second-generation pCHA5II).
  • Assessment of neutralizing antibody activity against various H5N1 clade viruses.
  • Evaluation of vaccine efficacy through animal challenge studies.

Main Results:

  • CHA5 with a P157S mutation showed increased neutralizing activity against clade 2.3 viruses.
  • The second-generation vaccine, pCHA5II, elicited higher cross-neutralization against all tested H5N1 viruses.
  • pCHA5II demonstrated the broadest protection profile in neutralization and challenge studies.

Conclusions:

  • Updating the consensus sequence to create pCHA5II is a promising strategy for broad H5N1 protection.
  • Combining pCHA5II with electroporation delivery enhances cross-reactivity against divergent H5N1 influenza viruses.
  • This approach represents a significant advancement in developing broadly protective influenza vaccines.

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