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- W3028090239 abstract "Cyprinid herpesvirus 2 (CyHV-2) is a highly contagious pathogen of goldfish (Carassius auratus) and Prussian carp (Carassius auratus gibelio) causing herpesviral hematopoietic necrosis. Our previous study revealed that CyHV-2 can persistently infect the kidney and spleen of goldfish that recovered from a primary infection. In this study, we tried to identify the cells persistently infected with the virus in surviving fish and investigated virus reactivation in the survivors injected with immunosuppressants, namely dexamethasone (Dex) and cyclosporine A (CsA). Virus DNA was detected from the monocytes that were isolated from the trunk kidney of the asymptomatic survivors, suggesting that monocytes/macrophages are major cells that may be persistently infected with CyHV-2. A significant increase of virus DNA levels was detected in the group injected with Dex at 10 and 21 days post-injection (dpi). In the fish group injected with CsA, the virus DNA level was the same as that in the control group at 10 dpi but increased in some organs at 21 dpi. Compared with Dex-injected fish at 10 dpi, the group injected with both Dex and CsA showed a greater increase in virus DNA levels. The gene expression of phagocytosis-associated genes, major histocompatibility complex (MHC) class II and p47phox, and anti-virus antibody levels increased in the CsA group due to virus reactivation in the infected cells but not in the Dex and Dex & CsA groups, indicating that Dex effectively suppressed monocyte/macrophage function and antibody production. In addition, recombinant interferon γ (IFNγ) supplementation in the kidney leukocyte culture that was isolated from survivors showed a reduction of virus DNA. CsA may inhibit T-helper 1 (Th1) cells and consequently IFNγ production, causing a synergetic effect with Dex on virus reactivation. The results suggest that the activity of monocytes/macrophages stimulated by IFNγ can relate to virus latency and reactivation in asymptomatic virus carriers." @default.
- W3028090239 created "2020-05-29" @default.
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- W3028090239 date "2020-08-01" @default.
- W3028090239 modified "2023-10-02" @default.
- W3028090239 title "Reactivation of cyprinid herpesvirus 2 (CyHV-2) in asymptomatic surviving goldfish Carassius auratus (L.) under immunosuppression" @default.
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- W3028090239 doi "https://doi.org/10.1016/j.fsi.2020.05.020" @default.
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