Adjuvant effect in aquaculture fish of cell-wall glycolipids isolated from acid-fast bacteria

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Mycobacteriosis and nocardiosis in cultured fish caused by infections with acid-fast bacteria, are responsible for large economic losses globally. In this study, we suggest a novel adjuvant using glycolipids that activates host immune systems. The immune response to glycolipids stimulation was investigated using ginbuna crucian carp. Ginbuna vaccinated with FKC (formalin-killed cells) + glycolipids isolated from Mycobacterium sp., upregulated inflammatory- and Th1-related cytokines, and a DTH (delayed-type hypersensitivity) response was confirmed only in ginbuna vaccinated with FKC + glycolipids. These observations suggest that glycolipids activated host innate and cell-mediated immunity. Subsequently, we evaluated the adjuvant effect of glycolipids against amberjack nocardiosis. In a challenge test, a higher survival rate was observed in amberjack vaccinated with FKC + glycolipids emulsified with conventional oil adjuvant than in fish vaccinated with FKC + oil adjuvant without glycolipids. Therefore, glycolipids potentially could be used as a practical, economical and safe adjuvant for aquaculture fish.HighlightsGlycolipids isolated from Mycobacterium sp. activate ginbuna crucian carp innate immune system.Th1-dominant immunity in ginbuna crucian carp is induced by glycolipids isolated from Mycobacterium sp.Glycolipids isolated from N. seriolae could be used as practical adjuvant against nocardiosis in yellowtail aquaculture industry.

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