Single or combined effects of Lactobacillus sakei and inulin on growth, non-specific immunity and IgM expression in leopard grouper (Mycteroperca rosacea).
The aim of this study was to evaluate the single or combined effects of Lactobacillus sakei with inulin suitable for immunological in vivo studies in farmed fish. By in vitro assays, L. sakei strain 5-4 showed antibacterial activities against all assayed fish pathogens (except the Vibrio harveyi strain CAIM-1793). L. sakei was able to survive at high fish bile concentrations. Fermentation of the agave inulin resulted in a large increase in number of lactobacilli. For the in vivo study, fish were fed for 8 weeks four practical diets: control diet (control), L. sakei 5-4 (10(7) CFU/g), inulin (1% or 10 g/kg) and L. sakei + inulin (10(7) CFU/g + 10 g/kg). The weight gain showed clearly the synergistic effect of L. sakei 5-4 and inulin at 6 and 8 weeks of treatments. Leopard grouper fed with L. sakei alone or combined with inulin have significantly increased the assayed physiological and humoral immune parameters. By real-time PCR assays, the mRNA transcripts of immunoglobulin M (IgM) were found to be higher expressed in intestine, head kidney, mucus, gill, spleen and skin. Moreover, mRNA expression levels of IgM in head kidney and anterior intestine were measured by real-time PCR. L. sakei 5-4 and L. sakei + inulin supplemented diet up-regulated the expression of IgM at week 4 and 8 in intestine and head kidney, respectively. These results support the idea that the L. sakei 5-4 alone or combined with agave inulin improved growth performance and stimulates the immune system of leopard grouper.
Centro de Investigaciones Biológicas del Noroeste (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, 23090, La Paz, B.C.S., Mexico.
Martha
M
Reyes-Becerril
Felipe
F
Ascencio
Vicente
V
Gracia-Lopez
Ma Esther
ME
Macias
Marcos Cadena
MC
Roa
María Ángeles
MÁ
Esteban
D000704:Analysis of Variance; D000818:Animals; D017931:DNA Primers / Q000235:genetics; D019587:Dietary Supplements; D004357:Drug Synergism; D007075:Immunoglobulin M / Q000378:metabolism; D066298:In Vitro Techniques; D007444:Inulin / Q000494:pharmacology*; D007778:Lactobacillus / Q000187:drug effects / Q000254:growth & development / Q000276:immunology*; D008826:Microbial Sensitivity Tests; D009113:Muramidase / Q000097:blood; D010473:Perciformes / Q000254:growth & development* / Q000276:immunology* / Q000382:microbiology; D056692:Prebiotics; D019936:Probiotics / Q000008:administration & dosage / Q000494:pharmacology*; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D054712:Salinity
D017931:DNA Primers; D007075:Immunoglobulin M; D056692:Prebiotics; D007444:Inulin; D009113:Muramidase