ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (10): 2061-2069.doi: 10.11843/j.issn.0366-6964.2019.10.012

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Caprine Parainfluenza Virus Type 3 Induces Apoptosis in Goat Bronchial Epithelial Cells via Caspase-mediated Pathways

LIAO Zheng1,3, LI Jizong1,2*, XIAO Fang1,3, ZHONG Chunyan1,3, YANG Leilei1, MAO Li1, LI Wenliang1, SUN Min1, ZHU Xing3, JI Xinqin3, ZHANG Wenwen1, LIU Maojun1   

  1. 1. Key Laboratory of Veterinary Diagnosis, Key Laboratory of Veterinary Biological Engineering and Technology of Ministry of Agriculture, Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;
    2. School of Pharmacy, Linyi University, Linyi 276000, China;
    3. College of Animal Science of Guizhou University, Guiyang 550025, China
  • Received:2019-04-10 Online:2019-10-23 Published:2019-10-23

Abstract: To investigate the molecular mechanisms of apoptosis in goat bronchial epithelial cells infected with CPIV3 in vitro, the cells were inoculated with CPIV3 JS2013 strain that isolated from the previous study. The cultural supernatants of the cells were harvested at 12,24,36,48,72 and 96 h post inoculation(hpi), then qRT-PCR and TCID50 assays were conducted to determine CPIV3 proliferation levels. The apoptosis was examined by Annein V-FITC/PI double staining cell apoptosis detection kit; and relevant indicators were detected by Caspase-3, Caspase-8 and Caspase-9 activity detection kit, qRT-PCR assay, and Western blot. The results showed that virus titers increased from 101.80 to 104.50 TCID50·mL-1 at 96 hpi. Observation with inverted microscope showed that CPIV3-infected cells had typical CPE, including shrink and disrupted. Flow cytometry analysis of apoptosis showed that the number of apoptotic cells increased to 19.66% at 48 hpi. Caspases activity assay demonstrated that CPIV3 infection increased the activation of Caspase-3, Caspase-8 and Caspase-9. Meanwhile, the expression levels of intrinsic pathway and extrinsic apoptotic pathway mRNA were increased. In addition, cleaved Caspase-3 was activated in CPIV3-infected cells. These findings indicate that CPIV3 infection could induce apoptosis and the activation of Caspase played important role in apoptosis.

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