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Response of Ig-positive cells to Enteromyxum scophthalmi (Myxozoa) experimental infection in turbot, Scophthalmus maximus (L.): A histopathological and immunohistochemical study


Response of Ig-positive cells to Enteromyxum scophthalmi (Myxozoa) experimental infection in turbot, Scophthalmus maximus (L.): A histopathological and immunohistochemical study



Fish and Shellfish Immunology 21(5): 501-512



ISSN/ISBN: 1050-4648

PMID: 16679029

DOI: 10.1016/j.fsi.2006.02.006

In recent years, a new parasite that causes severe losses has been detected in farmed turbot, Scophthalmus maximus (L.), in Northwestern Spain. Dead fish showed emaciation and cachexia caused by severe necrotizing enteritis that affected all portions of the digestive tract. The parasite was classified as a myxosporean and named Enteromyxum scophthalmi. This study was set up to gain insights into the immune response of fish against this parasitic infection. The kinetics of immunoglobulin positive (Ig+) cells in spleen, kidney and intestine from turbot experimentally infected with E. scophthalmi was studied. For evaluating both the progress of infection and the lesions induced by the parasite, we performed histopathological studies and for detecting Ig+ cells in situ we used an indirect immunohistochemical method. In fish exposed to the parasite, the number of Ig+ cells significantly increased in the intestine, the target organ of the parasite, whereas in spleen and kidney, haematopoietic organs where the parasite was not detected, the number of Ig+ cells decreased. Furthermore, the pattern of distribution of Ig+ cells changed in all three organs examined in recipient/infected fish compared with control fish (not exposed to the parasite). The results obtained in this study indicate that the infection by E. scophthalmi in turbot induced an immune response that involved changes in the number and distribution of Ig+ cells.

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Accession: 023517861

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