Title Establishment and Characterization of the Epithelioma Papulosum Cyprini (EPC) Cell Line Persistently Infected with Infectious Pancreatic Necrosis Virus (IPNV), an Aquabirnavirus
Author Hyoung Jun Kim1, Jae-Kwon Cho2, Hyung-Kyu Hwang2, Myung-Joo Oh3, and Toyohiko Nishizawa3*
Address 1Animal, Plant and Fisheries Quarantine and Inspection Agency, Jungbu Regional Office, Incheon 400-800, Republic of Korea, 2Southwest Sea Fisheries Research Institute, National Fisheries Research & Development Institute, Yeosu 556-823, Republic of Korea, 3Department of Aqualife Medicine, Chonnam National University, Yeosu 550-749, Republic of Korea
Bibliography Journal of Microbiology, 50(5),821-826, 2012,
Key Words aquabirnavirus, infectious pancreatic necrosis virus, IPNV, persistent infection, virus productivity, EPC
Abstract Infectious pancreatic necrosis virus (IPNV), a type species of aquabirnaviruses in the family Birnaviridae, is an etiological agent of infectious pancreatic necrosis and has been isolated from epizootics of cultured salmonids. In the present study, an epithelioma papulosum cyprini (EPC) cell line persistently infected with IPNV (PI-EPC) was experimentally established by subculturing EPC cells surviving IPNV infection, and was characterized. PI-EPC cells were morphologically indistinguishable from EPC, but continued to grow and yield IPNV. PI-EPC cells showed no cytopathic effect due to IPNV inoculation, and susceptibility of PI-EPC cells against heterologous viruses was not different from that of EPC cells. Only one cell of 103.5 PI-EPC cells produced IPNV at approximately 100.5 50% tissue culture infectious dose (TCID50)/cell/day, which was approximately 1,000 times lower than that of normal EPC cells. PI-EPC cells that did not yield IPNV (N-PI-EPC) were screened. The IPNV genome was detected from both PI-EPC and N-PI-EPC cells, and the IPNV VP2 structural protein was detected from both cell lines, but no other IPNV proteins were observed by Western blot analysis with anti-IPNV serum. Thus, multiplication of IPNV in PI-EPC cells was regulated by some host cell factors, except interferon.