Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (9): 4593-4603.doi: 10.11843/j.issn.0366-6964.2025.09.037

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Prolyl Oligopeptidase Promotes the Replication of Foot and Mouth Disease Virus in PK15 Cells

WANG Ziyi1,2,3(), RU Yi1,2, LU Bingzhou1,2, YANG Yang1,2, ZHAO Longhe1,2, LI Yajun1,2, LI Jianbin1,2, LI Minggui1,2, MA Kun1,2, LENG Feifan3, HAO Rongzeng1,2,*(), ZHENG Haixue1,2,3,*()   

  1. 1. State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine of Lanzhou University, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
    2. Gansu Provincial Research Center of Basic Discipline of Pathogen Biology, Lanzhou 730046, China
    3. School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2024-12-12 Online:2025-09-23 Published:2025-09-30
  • Contact: HAO Rongzeng, ZHENG Haixue E-mail:215391193@qq.com;haorongzeng@163.com;zhenghaixue@caas.cn

Abstract:

The study aims to investigate the impact of prolyl oligopeptidase (POP) on the replication of foot-and-mouth disease virus (FMDV) in PK15 cells. Firstly, the effect of FMDV infection on POP expression in PK15 cells was analyzed using Western blot and real-time quantitative PCR (RT-qPCR). Secondly, a POP eukaryotic expression plasmid was constructed, and the effect of overexpression of POP on FMDV replication was assessed through Western blot, RT-qPCR, and virus titer assays (TCID50); Thirdly, specific siRNA targeting the POP gene was synthesized, and effective siRNAs sequences for interfering with endogenous POP expression were identified using RT-qPCR. The impact of downregulating endogenous POP expression on FMDV replication was further evaluated by Western blot, RT-qPCR, and virus titer assays (TCID50). The results indicated that FMDV infection did not significantly affect POP expression in PK15 cells. Overexpression of POP significantly promoted FMDV replication in PK15 cells, with viral replication level increasing in a dose-dependent manner as the dosage of POP expression increased. Downregulation of endogenous POP expression using siRNA significantly inhibited FMDV replication. This study revealed that the promoting effect of POP protein on FMDV replication from the host cell level at the first time. This finding provides a foundation for further exploration of the mechanism by which POP promotes FMDV replication.

Key words: prolyl oligopeptidase (POP), foot-and-mouth disease virus, virus replication, PK15 cells

CLC Number: