In vitro propagation of infectious hypodermal hematopoietic necrosis virus (Penaeus stylirostris penstyldensovirus) in PmLyO-Sf9 cells

Infectious hypodermal hematopoietic necrosis virus (IHHNV/PstDVI) was isolated and propagated in the hybrid shrimp-insect cell line PmLyO-Sf9. A few hours after inoculation with an infected tissue extract or virus suspension, cytopathic changes could be observed in the cell line, including clustering, enlargement, syncytium formation, granulation, vacuole formation, tapering, irregularities in the plasma membrane with extended tails, detachment, cell death, and accumulation of cellular debris. Expression of viral genes, the presence of virions, and cytological changes observed using transmission electron microscopy suggested replication of the virus in these cells. The virus was purified by ultracentrifugation, negatively stained, and examined using an electron microscope, and the purified virus was found to be infectious both in vitro and in vivo. This development opens avenues for the study of the basic molecular mechanism of IHHNV infection, pathogenesis, and replication, which is much needed for developing an antiviral strategy in aquaculture.

Automated summary

Infectious hypodermal hematopoietic necrosis virus (IHHNV/PstDVI) was successfully isolated and propagated in a hybrid shrimp-insect cell line PmLyO-Sf9. Cytopathic changes such as clustering, enlargement, syncytium formation, and cell death were observed in the infected cell line, indicating viral replication. The purified virus was found to be infectious both in vitro and in vivo, providing insights for studying the molecular mechanism of IHHNV infection and developing antiviral strategies in aquaculture.