Molecular Nutrition

Study of Antimicrobial Peptide Sublancin Enhance Acquired Immunity of Mice

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  • College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2017-07-12

  Online published: 2018-01-04

Abstract

This experiment was designed to investigate the effects of intragastric administration of antimicrobial peptide Sublancin on acquired immunity of mice immunized with ovalbumin (OVA). Sixty BALB/c mice were randomly assigned into 5 groups with 12 mice per group. Mice in the blank control group received normal saline by intragastric administration, mice in the positive control group received 2.5 mg/kg body weight (BW) levamisole by intragastric administration, and mice in the antimicrobial peptide Sublancin groups received 0.5, 1.0 and 2.0 mg/kg BW antimicrobial peptide Sublancin by intragastric administration, respectively. All the mice were administrated intragastric daily for 14 days. Mice were immunized with model antigen OVA by subcutaneous infection after the intragastric administration 24 h, and enhanced immunization 1 time after 14 days, took blood and spleen after the second immunization 7 days, the contents of OVA-specific immunoglobulin (IgG) and its ubtype IgG1, IgG2a and cytokine in serum were detected by indirect enzyme linked immunosorbent assay (ELISA) method. The results showed as follows:1) compared with the blank control group, the serum OVA-specific IgG content of mice in 0.5, 1.0 and 2.0 mg/kg antimicrobial peptide Sublancin groups and positive control group was significantly increased (P<0.05 or P<0.01). 2) Compared with the blank control group, the serum OVA-specific IgG1 content of mice in 1.0 and 2.0 mg/kg antimicrobial peptide Sublancin groups and positive control group was significantly increased (P<0.05 or P<0.01), the serum OVA-specific IgG2a content of mice in 1.0 mg/kg antimicrobial peptide Sublancin group and positive control group was significantly increased (P<0.05), the spleen lymphocytes stimulation index of mice in 1.0 mg/kg antimicrobial peptide Sublancin group and positive control group was significantly increased (P<0.05). 3) Compared with the blank control group, the contents of T helper type 1 cell (Th1) interferon-γ(IFN-γ) and interleukin-2 (IL-2) in spleen lymphocyte supernatant liquid of mice in 1.0 mg/kg antimicrobial peptide Sublancin group and positive control group were significantly increased (P<0.05 or P<0.01). 4) Compared with the blank control group, the contents of T helper type 2 cell (Th2) interleukin-4 (IL-4) and interleukin-10 (IL-10) in spleen lymphocyte supernatant liquid of mice in 0.5 and 1.0 mg/kg antimicrobial peptide Sublancin groups and positive control group were significantly increased (P<0.05 or P<0.01). 5) There were no significant difference on the above testing indices among 0.5, 1.0 and 2.0 mg/kg antimicrobial peptide Sublancin groups and positive control group (P>0.05). This study indicated that antimicrobial peptide Sublancin can induce the mixed immune responses of Th1 and Th2 of OVA immunized mice, and enhance the humoral immunity and cellular immunity function.

Cite this article

ZHANG Xiaoya, YANG Qing, WANG Shuai, YANG Tianren, ZENG Xiangfang, QIAO Shiyan . Study of Antimicrobial Peptide Sublancin Enhance Acquired Immunity of Mice[J]. Chinese Journal of Animal Nutrition, 2018 , 30(1) : 236 -245 . DOI: 10.3969/j.issn.1006-267x.2018.01.029

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