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Knowledge on the course of infection, histopathology and innate immune response in Diplodus puntazzo

In cohabitation (CH) transmission, enteromyxosis was detected earlier and with higher infection levels in sharpsnout sea bream (Diplodus puntazzo) than in gilthead sea bream (Sparus aurata). Different parasite stages were found in the gut epithelium, but not in kidney or spleen. Increased infiltration of eosinophilic granular cells (EGC), lymphocytes and macrophages in the intestinal submucosa was observed in infected fish. Infections progressed faster and with higher pathological manifestations in the D. puntazzo than in S. aurata, which is in line with previous observations in field and epidemiological studies.

Amongst the three humoral factors studied, peroxidase content, and antiproteases and antitumoral activities, only peroxidase content increased in response to infection in all exposed fish at all sampling points, when compared to controls. Antiproteases activity was higher in recipient fish than in controls only on days 12 and 19 p.e., whereas variations in antitumoral activity were slight.

Cellular response was evaluated in histological sections, which demonstrated a remarkable abundance of eosinophilic granular cells.

Reported by

Universidad de Murcia (UMU)
Universidad de Murcia (UMU),Dept. Biología Celular, Facultad de Biología, Campus de Espinardo
30100 Murcia
Spain
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