Acta Veterinaria et Zootechnica Sinica ›› 2022, Vol. 53 ›› Issue (4): 1220-1230.doi: 10.11843/j.issn.0366-6964.2022.04.022

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Expression of Blomia tropicalis Major Allergens Blo t 5 and Blo t 21 Induced the Production of IgG and Regulatory T Cells in Mice

LUO Ying1,2, PENG Meiqi1,2, XIAO Zhengpan1,2, LUO Chenghui1,2, WANG Dayong1,2, PEI Yechun1,2*   

  1. 1. School of Life Sciences, Hainan University, Haikou 570228, China;
    2. One Health Institute, Hainan University, Haikou 570228, China
  • Received:2021-07-16 Online:2022-04-23 Published:2022-04-25

Abstract: To develop DNA vaccine against Blomia tropicalis allergy, we constructed eukaryotic expression vector pVAX1-PADRE-Blo t 5-21-CpG of major allergen fusion gene of Blomia tropicalis by codon optimization of Blo t 5 and Blo t 21 gene sequences. To verify the immune effect of the eukaryotic expression vector, BALB/c mice were immunized with 100 μg/100 μL of pVAX1-PADRE-Blo t 5-21-CpG by subcutaneous injection (n=6),and the serum levels of specific IgG, IgG1 and IgG2a were detected by ELISA. The changes of regulatory T cells in spleen lymphocytes of mice were detected by flow cytometry. The results showed that the eukaryotic expression plasmid pVAX1-PADRE- Blo t 5-21-CpG could induce the increase of specific IgG and IgG2a levels in mice, and the increase of IgG2a/IgG1 ratio suggested a bias towards a Th1 type immune response in mice after immunization. In addition, the plasmid pVAX1-PADRE-Blo t 5-21-CpG can induce higher levels of CD4+CD25+Foxp3+ T cells in mice, suggesting that the eukaryotic expression plasmid may induce immunosuppression.

Key words: Blomia tropicalis, allergen, eukaryotic expression vector, DNA vaccine

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