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Protective effects and mechanisms of a probiotic bacterium Lactobacillus rhamnosus against experimental Edwardsiella tarda infection in tilapia (Oreochromis niloticus)


, : Protective effects and mechanisms of a probiotic bacterium Lactobacillus rhamnosus against experimental Edwardsiella tarda infection in tilapia (Oreochromis niloticus). Veterinary Immunology and Immunopathology 113(3-4): 339-347

In recent years, probiotics, especially lactic acid bacteria, have been used as dietary supplements to protect fish from various infections. Here, we examined the protective effects of Lactobacillus rhamnosus against experimental Edwardsiella tarda infection in tilapia (Oreochromis niloticus). Cumulative mortality was significantly lower in probiotic-supplemented fish than in control fish. In a histopathological survey, pyogranulomatous responses were observed at an earlier stage and to a greater extent in the probiotic-supplemented fish than in the control fish. Immunohistochemistry using an anti-E. tarda antibody revealed a larger number of positive signals in pyogranuloma-participating cells, indicating an enhanced phagocytic ability. Alternative complement activity was significantly higher in the probiotic groups than in the control. These results suggest that L. rhamnosus enhanced the alternative complement system of the fish, enabling phagocytic cell aggregation, increasing phagocytic activity and subsequently protecting the fish from acute septicemic death by E. tarda infection. Prevention of thymic necrosis by the probiotic supplement seems to minimize immunosuppression and to initiate an immune response against edwardsiellosis.

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Accession: 012461959

PMID: 16870266

DOI: 10.1016/j.vetimm.2006.06.003

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Related references

Park, K.H.; Jeong, H.D., 1996: Enhanced resistance against Edwardsiella tarda infection in tilapia (Oreochromis niloticus) by administration of protein-bound polysaccharide. A protein-bound polysaccharide preparation, PS-K, isolated from Coriolus versicolor was evaluated for its ability to enhance resistance against E. tarda. At a dose rate of 0.1 mg PS-K/g body weight, maximum resistance was developed in tilapia 1 we...

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