Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (11): 5183-5190.doi: 10.11843/j.issn.0366-6964.2024.11.033

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Competitive Blocking Effect of Salmonella Enteritis Fimbriae Recombinant Protein on Its Cell Adhesion

Nana PENG(), Huimin NING, Yuhao CHEN, Xinying LI, Fuqiang ZHU, Guobin YU, Wei DONG*()   

  1. College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China
  • Received:2023-12-22 Online:2024-11-23 Published:2024-11-30
  • Contact: Wei DONG E-mail:1625989715@qq.com;dongwei@hunau.edu.cn

Abstract:

Adhesion of host small intestinal epithelial cells through fungal hairs and flagella is an indispensable and important link in pathogenic processes of Salmonella Enterison. This study aims to analyze the competitive blocking effect of the hair recombinant protein FimA-sefA expressed by prokaryotes on the adhesion of Salmonella Enteritis to intestinal epithelial cells (IPEC-J2). FimA and sefA gene fragments were cloned into pET28a (+), resulting in the construction of a recombinant plasmid pET28a-FimA-sefA, which was then transformed into the strain BL21 (DE3). The recombinant protein FimA-sefA was purified using nickel-column affinity chromatography (Ni-NTA). The adhesion of enteritis to IPEC-J2 cells was analyzed using indirect immunofluorescence (IFA) and plate counting. The molecular weight of the expressed recombinant protein FimA-sefA was 36 ku; the recombinant protein FimA-sefA, recombinant bacteria, and Salmonella Enteritis can adhere to IPEC-J2 cells. Recombinant protein FimA-sefA and recombinant bacteria can competitively block the adhesion of Salmonella Enteritis to IPEC-J2 cells, and the blocking effect of recombinant bacteria was stronger than that of the recombinant protein. We believe that the recombinant protein FimA-sefA can competitively block the adhesion of Salmonella Enteritis to IPEC-J2 cells to a certain extent, providing a new strategy for preventing and reducing enteritis infection.

Key words: Salmonella Enteritidis, fimbria protein, FimA-sefA, IPEC-J2, cell adhesion enteritidis

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