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Antimicrobial peptide CAP18 and its effect on Yersinia ruckeri infections in rainbow trout Oncorhynchus mykiss (Walbaum): comparing administration by injection and oral routes |
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| Authors: | J K Chettri F Mehrdana E B Hansen A Ebbensgaard M T Overgaard A H Lauritsen I Dalsgaard K Buchmann |
| Institution: | 1. Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, University of Copenhagen, Frederiksberg C, Denmark;2. National Food Institute, Technical University of Denmark, S?borg, Denmark;3. National Food Institute, Technical University of Denmark, Lyngby, Denmark;4. Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark;5. BioMar A/S, Mylius Erichsensvej 35, Brande, Denmark;6. National Veterinary Institute, Technical University of Denmark, Copenhagen, Denmark |
| Abstract: | The antimicrobial peptide CAP18 has been demonstrated to have a strong in vitro bactericidal effect on Yersinia ruckeri, but its activity in vivo has not been described. In this work, we investigated whether CAP18 protects rainbow trout Oncorhynchus mykiss (Walbaum) against enteric red mouth disease caused by this pathogen either following i.p. injection or by oral administration (in feed). It was found that injection of CAP18 into juvenile rainbow trout before exposure to Y. ruckeri was associated with lowered mortality compared to non‐medicated fish although it was less effective than the conventional antibiotic oxolinic acid. Oral administration of CAP18 to trout did not prevent infection. The proteolytic effect of secretions on the peptide CAP18 in the fish gastrointestinal tract is suggested to account for the inferior effect of oral administration. |
| Keywords: | antimicrobial peptide CAP18 rainbow trout Yersinia ruckeri |