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Flavivirus replication kinetics in early-term placental cell lines with different differentiation pathways
Julio Carrera1,2, Alice M Trenerry1, Cameron P Simmons2
1Department of Microbiology and Immunology, University of Melbourne, Peter Doherty for Infection and Immunity, Parkville, Melbourne, VIC, 3010, Australia.
Virology Journal
|December 15, 2021
Summary
West Nile virus (WNVKUN) replicates faster in placental cells than Zika virus (ZIKV). This suggests placental cell replication potential exists for flaviviruses, but crossing the placenta is key to congenital Zika syndrome.
Area of Science:
- Virology
- Pathogenesis
- Obstetrics
Background:
- Zika virus (ZIKV) caused a global health emergency due to its link to microcephaly and Guillain-Barré syndrome.
- ZIKV's unique ability to cross the placental barrier distinguished it from other flaviviruses like dengue and yellow fever.
- Congenital Zika syndrome highlights the critical impact of vertical transmission.
Purpose of the Study:
- To investigate and compare the replication kinetics of Zika virus (ZIKV) and West Nile virus strain Kunjin (WNVKUN) in placental cells.
- To understand the factors influencing flavivirus replication within the placental environment.
- To elucidate the viral characteristics contributing to ZIKV's distinct pathogenic profile in pregnancy.
Main Methods:
- Utilized early-term placental cell lines for in vitro replication studies.
- Quantified and compared replication rates and viral titers of ZIKV and WNVKUN.
- Analyzed flavivirus replication dynamics in a relevant human placental model.
Main Results:
- West Nile virus strain Kunjin (WNVKUN) demonstrated a greater replication rate compared to Zika virus (ZIKV).
- WNVKUN achieved higher viral titers in placental cell lines than ZIKV.
- Both viruses showed replication potential in placental cells, but WNVKUN replicated more efficiently.
Conclusions:
- All flaviviruses may possess the capability to replicate within placental tissues.
- The critical factor determining congenital Zika syndrome is the virus's ability to breach the placental barrier, not solely its replication efficiency.
- Understanding placental barrier crossing is essential for predicting and managing flavivirus-associated congenital abnormalities.
