Comparative analysis of the humoral immunity of skin mucus from
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Fish skin mucus contains several immune substances that provide the first line of defence against a broad spectrum of pathogens although they are poorly studied to date. Terminal carbohydrate composition and levels of total IgM antibodies, several immune-related enzymes (lysozyme, peroxidase, alkaline phosphatase, esterases, proteases and antiproteases) as well as the bactericidal activity (against fish pathogenic Vibrio harveyi, Vibrio angillarum, Photobacterium damselae and non-pathogenic bacteria Escherichia coli, Bacillus subtilis, Shewanella putrefaciens) were identified and measured in the skin mucus of five marine teleosts: gilthead seabream (Sparus aurata), European sea bass (Dicentrarchus labrax), shi drum (Umbrina cirrosa), common dentex (Dentex dentex) and dusky grouper (Epinephelus marginatus). First, lectin binding results suggests that skin mucus contain, in order of abundance, N-acetylneuraminic acid, glucose, N-acetyl-glucosamine, N-acetyl-galactosamine, galactose ...
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