Passage of dengue virus type 4 vaccine candidates in fetal rhesus lung cells selects heparin-sensitive variants that result in loss of infectivity and immunogenicity in rhesus macaques.

Full Abstract

Three dengue virus type 4 (DENV-4) vaccine candidates containing deletions in the 3' noncoding region were prepared by passage in DBS-FRhL-2 (FRhL) cells. Unexpectedly, these vaccine candidates and parental DENV-4 similarly passaged in the same cells failed to elicit either viremia or a virus-neutralizing antibody response. Consensus sequence analysis revealed that each of the three viruses, as well as the parental DENV-4 when passaged in FRhL cells, rapidly acquired a single Glu327-Gly substitution in domain III (DIII) of the envelope protein (E). These variants appear to have accumulated in response to growth adaptation to FRhL cells as shown by growth analysis, and the mutation was not detected in the virus following passage in C6/36 cells, primary African green monkey kidney cells, or Vero cells. The Glu327-Gly substitution was predicted by molecular modeling to increase the net positive charge on the surface of E. The Glu(327)-Gly variant of the full-length DENV-4 selected after three passages in FRhL cells showed increased affinity for heparan sulfate compared to the unpassaged DENV-4, as measured by heparin binding and infectivity inhibition assays. Evidence indicates that the Glu327-Gly mutation in DIII of the DENV-4 E protein was responsible for reduced infectivity and immunogenicity in rhesus monkeys. Our results point out the importance of cell substrates for vaccine preparation since the virus may change during passages in certain cells through adaptive selection, and such mutations may affect cell tropism, virulence, and vaccine efficacy.

Author information

Author/s: Añez, Germán (G); Men, Ruhe (R); Eckels, Kenneth H (KH); Lai, Ching-Juh (CJ);

Affiliation: Molecular Viral Biology Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-8005, USA.

Journal and publication information

Publication Type: Journal Article; Research Support, N.I.H., Intramural; Research Support, Non-U.S. Gov't

Journal: Journal of virology (J Virol), published in United States. (Language: eng)

Reference: 2009-Oct; vol 83 (issue 20) : pp 10384-94

Dates: Created 2009/09/24; Completed 2009/10/16;

PMID: 19656873, status: MEDLINE (last retrieved date: 10/16/2009)

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