DataSheet_1_Oral Administration of Lactococcus lactis Producing Interferon Type II, Enhances the Immune Response Against Bacterial Pathogens in Rainbow Trout.docx

• Main Authors: Alvaro Santibañez (11025117), Diego Paine (11025120), Mick Parra (11025123), Carlos Muñoz (3147006), Natalia Valdes (3489596), Claudia Zapata (2421004), Rodrigo Vargas (731512), Alex Gonzalez (3489584), Mario Tello (657157)
• Format: Dataset
• Language: unknown
• Published: 2021
• Subjects: Immunology; Applied Immunology (incl. Antibody Engineering; Xenotransplantation and T-cell Therapies); Autoimmunity; Cellular Immunology; Humoural Immunology and Immunochemistry; Immunogenetics (incl. Genetic Immunology); Innate Immunity; Transplantation Immunology; Tumour Immunology; Immunology not elsewhere classified; Genetic Immunology; Animal Immunology; Veterinary Immunology; Lactococcus lactis; interferon type II; Flavobacterium psychrophilum; salmonids; oral administration; Atlantic salmon
• Online Access: https://doi.org/10.3389/fimmu.2021.696803.s001

Lactic acid bacteria are a powerful vehicle for releasing of cytokines and immunostimulant peptides at the gastrointestinal level after oral administration. However, its therapeutic application against pathogens that affect rainbow trout and Atlantic salmon has been little explored. Type II interferon in Atlantic salmon activates the antiviral response, protecting against viral infection, but its role against bacterial infection has not been tested in vivo. In this work, through the design of a recombinant lactic acid bacterium capable of producing Interferon gamma from Atlantic salmon, we explore its role against bacterial infection and the ability to stimulate systemic immune response after oral administration of the recombinant probiotic. Recombinant interferon was active in vitro, mainly stimulating IL-6 expression in SHK-1 cells. In vivo, oral administration of the recombinant probiotic produced an increase in IL-6, IFNγ and IL-12 in the spleen and kidney, in addition to stimulating the activity of lysozyme in serum. The challenge trials indicated that the administration of the IFNγ-producing probiotic doubled the survival in fish infected with F. psychrophilum. In conclusion, our results showed that the oral administration of lactic acid bacteria producing IFNγ managed to stimulate the immune response at a systemic level, conferring protection against pathogens, showing a biotechnological potential for its application in aquaculture.