Mandarin Fish Ranavirus (MRV) Infection Induced Inflammation and Histologic Lesions in the Gut of Mandarin Fish

文献类型： 外文期刊

第一作者： Gao, Xinru

作者： Gao, Xinru;Zhang, Ziye;Li, Yugu;Gao, Xinru;Zhang, Ziye;Ma, Yanping;Hao, Le;Liu, Zhenxing;Gao, Xinru;Zhang, Ziye;Ma, Yanping;Hao, Le;Liu, Zhenxing;Huang, Wen

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关键词： histologic lesions; inflammation; mandarin fish ranavirus; pathogenesis

期刊名称：JOURNAL OF FISH DISEASES （ 影响因子：2.2； 五年影响因子：2.2 ）

ISSN： 0140-7775

年卷期： 2025 年 48 卷 1 期

页码：

收录情况： SCI

摘要： Mandarin fish ranavirus (MRV) is widely spread in China and causes huge economic losses to the mandarin fish (Siniperca chuatsi) aquaculture. However, the pathogenesis of MRV is still unclear. In the present study, mandarin fish were artificially infected with MRV, and then different gut compartments from diseased fish were subjected to histologic analysis by H&E staining, quantification of proinflammatory genes and MRV copies by qPCR. MRV-MCP protein expression was assessed using indirect fluorescence assay (IFA) and immunohistochemistry. Proliferation of IgM(+) B cells was evaluated by indirect fluorescence assay (IFA). Then, we found that MRV infection caused serious histologic lesions along with inflammatory cell infiltration, especially in the foregut. A significant accumulation of IgM(+) B cells was detected in the foregut (similar to 6.5-fold) and hindgut (similar to 3.3-fold), respectively. The expression of inflammation-related genes such as IL-1 beta, IL-6, IL-8, TNF-alpha, CSF1r and NCF1 was significantly upregulated in the foregut, varying from similar to 2.8-fold to similar to 11.9-fold. In addition, MRV exhibited foregut tropism, according to the investigation of viral loads and MCP protein expression. Overall, our findings indicated that MRV-induced hyperinflammation in the gut eventually led to enteritis. This study provided new insights into uncovering the pathogenesis of MRV infection.

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