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The 2014–2016 Ebola outbreak caused over 28,000 cases and 11,000 deaths. Merck & Co. Inc., Kenilworth, NJ USA and NewLink Genetics are working with private and public partners to develop and license an Ebola vaccine that was evaluated extensively during the outbreak. The vaccine referred to as V920 is a recombinant vesicular stomatitis virus (rVSV) in which the VSV-G envelope glycoprotein (GP)...
This review focuses on a dengue virus (DENV) vaccine candidate based on a recombinant subunit approach which targets the DENV envelope glycoprotein (E). Truncated versions of E consisting of the N-terminal portion of E (DEN-80E) have been expressed recombinantly in the Drosophila S2 expression system and shown to have native-like conformation. Preclinical studies demonstrate that formulations containing...
We describe here the preclinical development of a dengue vaccine composed of recombinant subunit carboxy-truncated envelope (E) proteins (DEN-80E) for each of the four dengue serotypes. Immunogenicity and protective efficacy studies in Rhesus monkeys were conducted to evaluate monovalent and tetravalent DEN-80E vaccines formulated with ISCOMATRIX™ adjuvant. Three different doses and two dosing regimens...
Challenges associated with the interference observed between the dengue virus components within early tetravalent live-attenuated vaccines led many groups to explore the development of recombinant subunit based vaccines. Initial efforts in the field were hampered by low yields and/or improper folding, but the use of the Drosophila S2 cell expression system provided a mechanism to overcome these limitations...
With several dengue vaccine candidates progressing through clinical trials, several options for controlling this disease appear feasible. This would represent a major achievement and reflect decades of research and development activities. The challenges associated with the limited understanding of protective responses and those factors which determine disease severity remain, but with prospective...
Truncated recombinant dengue virus envelope protein subunits (80E) are efficiently expressed using the Drosophila Schneider-2 (S2) cell expression system. Binding of conformationally sensitive antibodies as well as X-ray crystal structural studies indicate that the recombinant 80E subunits are properly folded native-like proteins. Combining the 80E subunits from each of the four dengue serotypes with...
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