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Effects of recombinant Lactobacillus casei on growth performance, immune response and disease resistance in crucian carp, Carassius auratus.

  • 2020-04
  • Fish & Shellfish Immunology 99
    • Yi‐di Kong
    • Min Li
    • Jiaxin Tian
    • Linhui Zhao
    • Yuanhuan Kang
    • Lei Zhang
    • Guiqin Wang
    • Xiaofeng Shan


In the present study, we constructed two recombinant Lactobacillus casei (L. casei) Lc-pPG-1-AcrV (surface-displayed) and Lc-pPG-2-AcrV (secretory) constitutively expressing AcrV protein of Aeromonas veronii (A. veronii). Expression of recombinant AcrV protein was verified by western blot and immunofluorescence technique. Compared with PBS group, the final weight (FW), weight gain (WG) and specific growth rate (SGR) of fish fed Lc-pPG-1-AcrV, Lc-pPG-2-AcrV and Lc-pPG diets after 56 days observed significantly increase (p < 0.05), while the feed conversion ratio (FCR) showed a significantly decrease (p < 0.05). The recombinant L. casei strains were orally administrated to crucian carp, and significant increased (p < 0.05) the immunoglobulin M (IgM), elevated the acid phosphatase (ACP), alkaline phosphatase (AKP), lysozyme (LZM) and superoxide dismutase (SOD) activity in serum. Moreover, leukocytes phagocytosis percentage and index of the recombinant L. casei were both enhanced. The results demonstrated that the recombinant L. casei could elicit systemic immune responses and increase the serum immunological index. The Interleukin-10 (IL-10), Interleukin-1β (IL-1β), interferon-γ (IFN-γ) and Tumor Necrosis Factor-α (TNF-α) levels in liver, spleen, kidney and intestine have up regulated significantly in tissues (p < 0.05), suggesting that the recombinant L. casei has the ability to induce expression of cytokines and enhance the innate immune response. Higher survival rates were exhibited that crucian carp immunized with Lc-pPG-1-AcrV (67.5%) and Lc-pPG-2-AcrV (52.5%) after challenge with A. veronii. In conclusion, these two recombinant L. casei vaccine were effective in improving crucian carp growth, immunity response and disease resistance. The recombinant L. casei strains may be a promising candidate for the development of an oral vaccine against A. veronii.

Keywords: Crucian carp; Disease resistance; Immune response; Lactobacillus casei.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Lactobacillus casei Lc-11Enhanced Disease ResistanceBeneficial
Lactobacillus casei Lc-11Improved Feed Conversion RatioBeneficial
Lactobacillus casei Lc-11Improved Growth PerformanceBeneficial
Lactobacillus casei Lc-11Improved Immune ResponseBeneficial
Lactobacillus casei Lc-11Increased Cytokine ExpressionBeneficial
Lactobacillus casei Lc-11Increased PMN Cell Phagocytic CapacityBeneficial

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