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Propagation of Brazilian Zika virus strains in static and suspension cultures using Vero and BHK cells.

Abstract：

:The recent spread of Zika virus (ZIKV) in the Americas and the Pacific has reached alarming levels in more than 60 countries. However, relatively little is known about the disease on a virological and epidemiological level and its consequences for humans. Accordingly, a large demand for in vitro derived Brazilian ZIKV material to support in vitro and in vivo studies has arisen. However, a prompt supply of ZIKV and ZIKV antigens cannot be guaranteed as the production of this virus typically using Vero or C6/36 cell lines remains challenging. Here we present a production platform based on BHK-21 suspension (BHK-21SUS) cells to propagate Brazilian ZIKV at larger quantities in perfusion bioreactors. Scouting experiments performed in tissue culture flasks using adherent BHK-21 and Vero cells have demonstrated similar permissivity and virus yields for four different Brazilian ZIKV isolates. The cell-specific yield of infectious virus particles varied between respective virus strains (1-48PFU/cell), and the ZIKV isolate from the Brazilian state Pernambuco (ZIKVPE) showed to be a best performing isolate for both cell lines. However, infection studies of BHK-21SUS cells with ZIKVPE in shake flasks resulted in poor virus replication, with a maximum titer of 8.9×103PFU/mL. Additional RT-qPCR measurements of intracellular and extracellular viral RNA levels revealed high viral copy numbers within the cell, but poor virus release. Subsequent cultivation in a perfusion bioreactor using an alternating tangential flow filtration system (ATF) under controlled process conditions enabled cell concentrations of about 1.2×107cells/mL, and virus titers of 3.9×107PFU/mL. However, while the total number of infectious virus particles was increased, the cell-specific yield (3.3PFU/cell) remained lower than determined in adherent cell lines. Nevertheless, the established perfusion process allows to provide large amounts of ZIKV material for research and is a first step towards process development for manufacturing inactivated or live-attenuated ZIKV vaccines.

journal_name

Vaccine

journal_title

Vaccine

authors

Nikolay A,Castilho LR,Reichl U,Genzel Y

doi

10.1016/j.vaccine.2017.03.018

subject

Has Abstract

pub_date

2018-05-24 00:00:00

pages

3140-3145

issue

22

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(17)30324-9

journal_volume

36

pub_type

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