title: Isolation of lactic acid bacteria from kuruma shrimp (Marsupenaeus japonicus) intestine and assessment of immunomodulatory role of a selected strain as probiotic.
abstract: Fifty-one lactic acid bacteria (LAB) strains were isolated and identified based on 16S ribosomal DNA sequence from the intestinal tracts of 142 kuruma shrimps (Marsupenaeus japonicus) collected from Kanmon Strait, Fukuoka and Tachibana Bay, Nagasaki, Japan. Cellular immunomodulatory function of 51 isolated LAB strains was assessed by measuring the level of interferon (IFN)-γ induction in mouse spleen cell culture. The strain Lactococcus lactis D1813 exhibited the highest amount of IFN-γ production and also bactericidal activity and was selected for testing its immunomodulatory role as a probiotic in kuruma shrimp. We also assessed the effect of dietary incorporation of this probiotic on resistance to Vibrio penaeicida infection in the kuruma shrimp. Our results demonstrate that probiotic L. lactis D1813-containing diet-fed (10⁵ cfu g⁻¹) shrimps displayed a significant up-regulation of lysozyme gene expressions in the intestine and hepatopancreas. However, insignificantly higher expression of anti-lipopolysaccharide factor, super oxide dismutase, prophenoloxidase, and toll-like receptor 1 was recorded in the intestine of shrimps fed the probiotic diet. Moreover, significantly increased (P < 0.01) resistance to the bacterial pathogen in term of better post-infection survival (61.7 %) was observed in the shrimps fed with the probiotic-incorporated diet compared with the control diet-fed group (28.3 %). The present study indicates the immunomodulatory role of the LAB L. lactis D1813 on the kuruma shrimp immune system and supports its potential use as an effective probiotic in shrimp aquaculture.
authors.affiliation: Kyushu Medical Co., Ltd., 13-4 Ohte-machi, Kokurakita-ku, Kitakyushu, Fukuoka, 803-0814, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Maeda
authors.forename: A
authors.initials: A
authors.lastname: Shibata
authors.forename: G
authors.initials: G
authors.lastname: Biswas
authors.forename: H
authors.initials: H
authors.lastname: Korenaga
authors.forename: T
authors.initials: T
authors.lastname: Kono
authors.forename: T
authors.initials: T
authors.lastname: Itami
authors.forename: M
authors.initials: M
authors.lastname: Sakai
mesh_terms: D000818:Animals; D056747:Immunomodulation / Q000276:immunology*; D007422:Intestines / Q000276:immunology* / Q000382:microbiology*; D019344:Lactic Acid / Q000276:immunology; D013294:Lactococcus lactis / Q000145:classification / Q000276:immunology* / Q000302:isolation & purification; D033561:Penaeidae / Q000276:immunology* / Q000382:microbiology*; D019936:Probiotics / Q000627:therapeutic use*; D013045:Species Specificity
chemical_list: D019344:Lactic Acid
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